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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

volcanic activity

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sinabung - the eruptive plume of 07.03.2021 / around 7 p.m. - sources: Rizal and PVMBG
Sinabung - the eruptive plume of 07.03.2021 / around 7 p.m. - sources: Rizal and PVMBG

Sinabung - the eruptive plume of 07.03.2021 / around 7 p.m. - sources: Rizal and PVMBG

The Sinabung erupted on Sunday March 7, 2021 at 7:01 p.m. WIB with the observed height of the ash column ± 1000 m above the summit (± 3460 m above sea level). The ash column was observed to be gray with thick intensity towards the northwest. This eruption was recorded on a seismograph with a maximum amplitude of 57 mm and a duration of 189 seconds.

A thin white plume is observed about 50-1000 meters from the summit.

Seismicity is also marked on March 7 by:

- 53 collapse / avalanche earthquakes

- 21 emission earthquakes
- 1 Tornillo-type earthquake
- 10 low frequency earthquakes
- 36 hybrid / multiphase earthquakes
- 3 deep volcanic earthquakes
- 1 local tectonic earthquake.

 

The activity level remains at 3 / siaga, with no-go zones unchanged.

 

Source: PVMBG

The Anak Krakatau sticks out its tongue - image Eos - Sentinel Hub 05.03.2021 - A. Luongo - one click to enlarge

The Anak Krakatau sticks out its tongue - image Eos - Sentinel Hub 05.03.2021 - A. Luongo - one click to enlarge

The Anak Krakatau is clearly visible and "sticks its tongue" to observers who are waiting for activity to resume.

On March 6, the seismicity is characterized by 4 shallow volcanic earthquakes, with an amplitude of 3 to 6 mm and the duration of the earthquake was 6 to 8 seconds.
and 1 episode of continuous tremor, with an amplitude of 1-6 mm, dominant 2 mm.

On March 7, a white plume, with fine to medium intensity, is observed about 25-100 meters from the summit.

Seismicity is characterized by:

- 3 emission earthquakes, with an amplitude of 3-4 mm and the earthquake lasted 37-52 seconds.
- 1 episode of continuous tremor, continuous with an amplitude of 1-6 mm, dominant 2 mm.


The activity level is at 2 / waspada, and the recommendation for the public / tourists remains valid: they are not allowed to approach the crater within a radius of 2 km from the crater.

 

Sources: Magma Indonesia & Sentinel-2

Sangay - SO2 emission of 06.03.2021 / 19h18 - PBL

Sangay - SO2 emission of 06.03.2021 / 19h18 - PBL

Sangay - Volcanic ash advisory for March 6 and 7, 2021 - Doc. VAAC Washington - one click to enlargeSangay - Volcanic ash advisory for March 6 and 7, 2021 - Doc. VAAC Washington - one click to enlarge

Sangay - Volcanic ash advisory for March 6 and 7, 2021 - Doc. VAAC Washington - one click to enlarge

During the night and early morning of March 6, ash emissions were observed using satellite images in Sangay, Ecuador.

These emissions had a moderate impact on the cantons of: Alfredo Baquerizo Moreno, and more strongly those of Alausí, Chunchi, Cumandá, Guamote, Pallatanga, Milagro, San Jacinto de Yaguachi, Samborondón, Daule and Durán.

The VAAC reported emissions reaching 3920 meters and moving west - southwest.

The seismicity of the day is characterized by:

- 16 LP earthquakes

- 17 explosion earthquakes

- 18 episodes of tremor of emissions.

 

The alert level remains amarilla

 

Source: IGEPN

Veniaminof - RSAM - VNSS Last 3 days 15 min interval - Doc. AVO at 08.03.2021 / 6:50 GMT

Veniaminof - RSAM - VNSS Last 3 days 15 min interval - Doc. AVO at 08.03.2021 / 6:50 GMT

Low level eruptive activity continues at Veniaminof. Numerous small explosions were seen on regional infrasound networks over the past day, some of which were heard and felt by residents of Perryville.

High surface temperatures have been observed in satellite data, suggesting that lava may be near or on the surface of the summit cone.

A low-level plume of ash and volcanic gas continues to be emitted and has been observed by pilots, as well as on web cameras and satellite imagery during periods of clear weather. The ash and gas plume was mostly below 3,000 meters asl, but was estimated at 4,500 meters asl in satellite data from last night. The plume continues to dissipate rapidly and the ash is mostly confined to the top caldera near the vent.

 

Source: AVO

Pinatubo Lake - photo 2006 Andrew Lilis

Pinatubo Lake - photo 2006 Andrew Lilis

The Pinatubo Volcano Monitoring Network has recorded thirty-five (35) volcanic earthquakes in the past 24 hours.

Alert Level 1 at Pinatubo means that there are low-level disturbances that may be related to tectonic processes beneath its edifice and that no impending eruption is expected.

Entering the Pinatubo crater area should be done with extreme caution and should be avoided if possible. Communities and local government units surrounding Pinatubo are reminded to always be prepared for both earthquake and volcanic disasters and to review, prepare and strengthen their contingency, contingency and disaster preparedness plans.

 

Source: DOST-PHIVOLCS

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Popocatépetl - overflight of the crater on 03.05.2021 - photos Cenapred / CNPC / Seguridad
Popocatépetl - overflight of the crater on 03.05.2021 - photos Cenapred / CNPC / Seguridad

Popocatépetl - overflight of the crater on 03.05.2021 - photos Cenapred / CNPC / Seguridad

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 82 exhalations and 234 minutes of tremor have been identified, accompanied by emissions of water vapor, volcanic gases and small amounts of ash.
Since March 6 in the morning, we observe an intermittent emission of volcanic gases and sometimes ash, which disperse in an east-south-east direction.


As part of the monitoring of the Popocatépetl volcano, expert staff from the Institute of Geophysics of the National Autonomous University of Mexico (UNAM) and the National Center for Disaster Reduction (CENAPRED), carried out an overview, with the support of the National Guard, yesterday March 5, 2021.

It has been observed that the inner crater maintains a diameter of 360-390 meters and an approximate depth of 150-180 meters, which is covered with various fragmented materials (tephra). Likewise, it was confirmed that there was no lava dome inside the crater.

 

Volcanic alert remains at Amarillo Fase 2

 

Source: Cenapred

Popocatépetl - overflight of the summit on 03.05.2021 - photo Cenapred / CNPC / Seguridad

Popocatépetl - overflight of the summit on 03.05.2021 - photo Cenapred / CNPC / Seguridad

At Etna, from around 1.00 UTC, a small lava flow is observed emitted by the effusive vent which opened on March 4, 2021 at the base of the SE crater. At the same time, the resumption of Strombolian activity at the level of the SE crater is also observed.

Strombolian activity continues confined to the craters of Voragine, Bocca Nuova and and NE.
Also from 1.00 UTC there is an increase in the volcanic tremor which at the moment is on medium-high values. The source of the tremor is located near the SE crater. Infrasound events are few in number and low in energy.

From 01:30 UTC there is a further rapid increase in the amplitude of the volcanic tremor which is currently at high values. The source of the tremor is located near the SE crater.

Etna SEC - strombolian activity on 07.03.2021 / 04h18 - INGV OE webcam

Etna SEC - strombolian activity on 07.03.2021 / 04h18 - INGV OE webcam

From around 03:30 UTC, there is an increase in Strombolian activity at the SE crater.
The activity forms an eruptive cloud which reaches a height of about 5000 m above sea level. dispersing towards E. Regarding the lava flow, the front is about 2900 m above sea level.

A lava overflow from the eastern slope of the SEC is observed from approximately 03:50 UTC. The lava flow produced by the effusive vent at the base of the CSE is still fed and its front reached an altitude of about 2800 m above sea level.

From 4:20 UTC there is a further rapid increase in the amplitude of the volcanic tremor which is currently at high values. The source of the tremor is located near the SE crater.

Etna - tremor at 07.03.2021 - 10 ° paroxysm - Doc. INGV OE

Etna - tremor at 07.03.2021 - 10 ° paroxysm - Doc. INGV OE

From around 06:00 UTC, the Strombolian activity at the SE crater (SEC) passed through a lava fountain and from 06:20 UTC, it formed an eruptive column which has now exceeded the height of 10,000 m above sea level. . dispersing eastward. As for the lava flows, which develop in the Valle del Bove, due to the cloud cover, it is not possible to make observations to estimate the share of the fronts.
The volcanic tremor of the last half hour reached a very high average amplitude and is constantly located near the SE crater
The number and energy of infrasound events are high and their locations are in the crater of the SEC.

From around 07:20 UTC, the SE Crater lava fountain ceased.

 

Source: INGV OE

Etna SEC - 2021.03.07, respectivement à 07h12 et 07h39 - webcam INGV OE - one click to enlargeEtna SEC - 2021.03.07, respectivement à 07h12 et 07h39 - webcam INGV OE - one click to enlarge

Etna SEC - 2021.03.07, respectivement à 07h12 et 07h39 - webcam INGV OE - one click to enlarge

The ICE-SAR rescue teams took advantage of the good weather this Saturday, March 6 to install a new VHF repeater at the top of the mountain in order to obtain better radio coverage in the area affected by the seismic swarm and a potential eruption on the Reykjanes Peninsula.

Reykjanes Peninsula - installation of a new VHF relay by local ICE-SAR teams - photo via Gisli Olafsson

Reykjanes Peninsula - installation of a new VHF relay by local ICE-SAR teams - photo via Gisli Olafsson

Just after midnight at 12:22 am on March 07, 2021, a tremor was detected which lasted 20 minutes. This tremor was similar to that measured on March 3, which had lasted several hours.

Following these events the seismicity intensified with earthquakes of more than 4. The biggest earthquake of the night was M5 at 2:02 am about 3 km west of Fagradalsfjall. As of midnight, more than 30 earthquakes on M3 have been located and 5 larger than M4.
More than 22,000 earthquakes have been detected in the region since the start of the activity.

 

Sources: IMO & Gisli Olafsson

Reykjanes Peninsula - location and magnitude of earthquakes at 07.03.2021 / 07:35 - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes at 07.03.2021 / 07:35 - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes at 07.03.2021 / 07:35 - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes at 07.03.2021 / 07:35 - Doc. IMO

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Pacaya - Strombolian activity at Mackenney on 05.03.2021 - photo Nanci Pineda via Conred

Pacaya - Strombolian activity at Mackenney on 05.03.2021 - photo Nanci Pineda via Conred

In Guatemala, the Strombolian eruption of the Pacaya continues: strong explosions expel incandescent materials 500 - 700 meters above the Mackenney crater, and generate a dense plume of ash and gas, at a sustained height of 4,500-5,500 m. asl., moving to a western and southern area.

Tephra and lapilli between 2mm and 6 cm, and blocks larger than 6 cm are likely to fall in the "red" zone (see map)

Ash falls are reported in the surroundings of Cerro chino, El Patrocinio and El Rodeo, etc.

The lava flows on the southern flank reach lengths between 700 and 1,300 meters, and present various ramifications and avalanches generated at the flow front.

 

Insivumeh recommends maintaining the closure of Pacaya National Park until further notice, and applying the protocols in the event of falling ballistic projectiles, within a radius of 6 km around the volcano, as well as those provided in the event of ash fall.

A warning has been issued for civil aviation, due to the presence of ash at an altitude of 5,500 m asl. dispersing over 40 km, mainly west and southwest.

 

Sources: Insivumeh & Conred

Pacaya - area likely to be impacted by falling ballistic materials as of 05.03.2021 - Insivumeh map - one click to enlarge

Pacaya - area likely to be impacted by falling ballistic materials as of 05.03.2021 - Insivumeh map - one click to enlarge

Pacaya - image Sentinel-2 bands 12,11,5 from 05.03.2021 - Doc. Insivumeh - one click to enlarge

Pacaya - image Sentinel-2 bands 12,11,5 from 05.03.2021 - Doc. Insivumeh - one click to enlarge

In Merapi, on Java, between February 26 and March 4, 2021, pyroclastic avalanche flows occurred 10 times, with a maximum glide distance estimated at 1,900 m towards the southwest and recorded on a seismogram of 'a maximum amplitude of 60 mm and a duration of 171 seconds.

The volume of the lava dome in the southwest sector is 711,000 m³ with a growth rate of 13,900 m³ / day.

Morphological analysis of the peak area based on photos of the southeast sector from March 1 to March 5, 2021 shows a change in the height of the dome. The height of the dome in the middle of the crater measures 45 m.

 

The activity level is at 3 / siaga

The current potential dangers come in the form of lava avalanches and hot clouds in the south-southwest sector, including Kali Kuning, Boyong, Bedog, Krasak, Bebeng and Putih, with a maximum distance of 5 km and in the south-eastern sector, the Gendol River up to 3 km.

The ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

Source: BPPTKG

Merapi - pyroclastic flow - 04.03.2021 - photo and Screenshot CCTV Tunggularum
Merapi - pyroclastic flow - 04.03.2021 - photo and Screenshot CCTV Tunggularum

Merapi - pyroclastic flow - 04.03.2021 - photo and Screenshot CCTV Tunggularum

Merapi - risk zones map, updated on 05.03.2021 - Doc. BPPTKG

Merapi - risk zones map, updated on 05.03.2021 - Doc. BPPTKG

The explosive activity continues in Sakurajima, with this March 5 an episode accompanied by a plume of ash and gas at 2,000 m. above the Minamidake crater, with dispersion to the south-east.

The JMA reports large bombs dispersing in the 800 to 1,100 m. from the crater.


Source: JMA

Sakurajima - 05.03.2021 / 19:03 - Doc. JMA

Sakurajima - 05.03.2021 / 19:03 - Doc. JMA

Seismic activity is not weakening in the Reykjanes Peninsula.

According to IMO, on 5.03.02021, around 2800 earthquakes were detected and as of midnight around 700 were detected. At 11:29 p.m. an M3.5 earthquake was located by Fagradalsfjall No quakes were measured overnight, but the seismic activity is still significant.

At 4:11 am on 03/06/2021, an M3.7 earthquake occurred by Fagradalsfjall. Five other earthquakes were measured above M3 this evening. There were 3 earthquakes of magnitude greater than M3 detected at noon, felt by the population.

 

A volcanic eruption in Keilir could trigger magma intrusions on other fissures on the Reykjanes Peninsula, according to geophysicist Pál Einarsson. The Reykjanes Peninsula is an active area and the region's volcanic activity is connected between systems. Pál Einarsson considers that it is possible that magma intrusions occur in the system of Reykjanes, Svartsengi, Krísuvík, Brennisteinsfjöll and Hengill.

In recent years, there have been repeated intrusions of magma into these systems, but they have not caused any damage. However, it cannot be ruled out that if an eruption did occur, it would lead to magma intrusions in other places on the Reykjanes Peninsula that could open cracks above ground without erupting there.
Such cracks could damage various infrastructure such as roads, power lines, waterways and telecommunications.

 

Sources: IMO and Mbls

2021.03.04 Reykjanes - Review of eruptions in the Peninsula since the year 800, and their lava flows - graph mbl.is

2021.03.04 Reykjanes - Review of eruptions in the Peninsula since the year 800, and their lava flows - graph mbl.is

The explanations of Pál Einarsson concerning the evolution of the situation in the Reykjanes Peninsula - Doc. mbls 04.03.2021

The explanations of Pál Einarsson concerning the evolution of the situation in the Reykjanes Peninsula - Doc. mbls 04.03.2021

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Satellite observations from March 1 confirmed that the new dome of the Soufrière in St. Vincent continues to grow slowly.


The new seismic station built at the Bamboo Range National Parks Interpretive Center on the east side of the volcano is operational. Data streaming from it to the Seismic Research Center (SRC) began on March 1, 2021.
A new Global Positioning System (GPS) continuous monitoring station has been installed on the recently constructed monument in Fancy.
Work continued at the Belmont Observatory on the installation of the seismic data acquisition system.
Additional measurements of carbon dioxide in the soil along the lower sides of the volcano have been completed.

 

Source: LA SOUFRIÈRE BULLETIN # 38 - 04 MARCH 2021 12h00

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Regional infrasound sensors detected a small explosion from the Veniaminof volcano on February 4, 2021 at 2:13 p.m. UTC (5:13 a.m. local time). Satellite and webcam views indicate low-level ash emissions (<10,000 feet / <3,000 meters asl.) heading in the SSE direction, and minor ash deposits are visible over the volcano.

 

As a result, AVO increases the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH on Veniaminof Volcano. Local seismic data remains offline due to a failure of a satellite link at Port Heiden. However, the Alaska Volcano Observatory continues to monitor Veniaminof with satellite and webcam data and remote infrasound, seismic and lightning networks.

Eruptive activity usually consists of minor ash emissions, lava fountains and lava flows from the small cone in the summit caldera. Ash emissions are usually confined to the summit crater, but larger events can lead to ash falls in nearby communities and airborne ash.
 

Source: AVO

Veniaminof - 03.04.2021 / 08:42 AKST- low ash plume (to the left of the pylon) - webcam Perryville NW FAA webcam / via AVO

Veniaminof - 03.04.2021 / 08:42 AKST- low ash plume (to the left of the pylon) - webcam Perryville NW FAA webcam / via AVO

Since January 20, 2021, the Pinatubo Volcanoes Network (PVN) has detected a total of 1,722 imperceptible earthquakes under the Pinatubo volcano.

The first group of earthquakes from January 20 to 26, 2021, occurred along the Sacobia lineament at depths of 15 to 28 kilometers and ranged between ML1.0 and ML2.5 in magnitudes.

This was replaced by a more persistent cluster of earthquakes occurring along a north-northwest-south-southeast trending structure 10 to 35 kilometers below the center of the building itself, with some shallower earthquakes occurring at both ends of the cluster. The earthquakes varied between ML0.5 and ML2.8 in magnitude.

All recorded earthquakes are associated with rock fracturing processes. Measurements made at Pinatubo Crater Lake in February 2021 yielded a total CO2 flux of 378 tonnes / day, which is still within the bottom range of 1000 tonnes / day recorded over the past decade. Slight increases in the temperatures of the fumaroles or monitored gas vents have been recorded, but other characteristics such as acidity (pH) remain unchanged.

Nine volcanic earthquakes have been recorded in the past 24 hours.

Given the persistence of seismic activity, DOST-PHIVOLCS raises the status of the Pinatubo volcano from alert level 0 to alert level 1. This means that there are low-level disturbances that may be related to tectonic processes under the volcano and that no imminent eruption is expected.

 

Source: Phivolcs

Mount Pinatubo - the acid lake - 2008 archive photo / Chris Tomong

Mount Pinatubo - the acid lake - 2008 archive photo / Chris Tomong

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia

Ninth paroxysm in two weeks at Etna, ... from 00:20 UTC, a resumption of weak strombolian activity at the SEC is observed. A slight increase in the mean amplitude of the volcanic tremor is observed. Infrasound activity also shows an increase in the number of events. The locations of the tremors indicate a movement from the source to the SEC.

Etna - 04.03.2021 / 00h20 UTC - a resumption of weak Strombolian activity is observed at the SEC - INGV OE webcam

Etna - 04.03.2021 / 00h20 UTC - a resumption of weak Strombolian activity is observed at the SEC - INGV OE webcam

From 01:00 UTC, there is an increase in strombolian activity at the SEC, accompanied by the emission of ash which rapidly disperses in the atmosphere towards the NE. At the same time, the Voragine crater also shows lively Strombolian activity with episodic explosions that rise above the level of the crater rim.

Etna- 04.03.2021 / 01h20 - from 01h UTC, an increase in the strombolian activity of the SEC is observed - INGV webcam

Etna- 04.03.2021 / 01h20 - from 01h UTC, an increase in the strombolian activity of the SEC is observed - INGV webcam

According to a now classic step pattern, the Strombolian activity at the SEC gradually increased and to pass at around 02:20 UTC to the stage of  lava fountain. At the same time, there is a further gradual increase in the amplitude of the volcanic tremor, the source of which is located in correspondence with the SEC at nearly 3000 m.

Then from 03:05 UTC, an overflow of lava can be observed from the SEC towards the Valle del Bove.

Etna - lava flow from 03:05 UTC on 04.03.2021 - INGV

Etna - lava flow from 03:05 UTC on 04.03.2021 - INGV

From 02:50 UTC, there is a decrease in the amplitude of the tremor which is at an average level; from 3:15 a.m., there is also a decrease in infrasonic activity, both in the frequency of occurrence and in the amplitude of the signals. At 4:15 a.m., the strombolian activity at the SEC is also significantly reduced while the lava overflow towards the Valle del Bove remains active.

Etna - trémor at 04.03.2021 / 04:10 - Doc. INGV OE

Etna - trémor at 04.03.2021 / 04:10 - Doc. INGV OE

Etna - 04.03.2021 / 06:41 - increase in the tremor from 06:00 UTC - INGV webcam

Etna - 04.03.2021 / 06:41 - increase in the tremor from 06:00 UTC - INGV webcam

The National Institute of Geophysics and Volcanology, Etna Observatory, announces that from around 06:00 UTC, the tremor has started to rise, returning to a high level, while intrasonic activity remains low. The small flow continues to be fed through an open mouth at the eastern base of the CSE which shows spattering activity. The activity also continues at the other summit craters.

 

Source: INGV OE

Pacaya - 03.03.2021 - photo Luis Alejandro Fuentes / via Conred

Pacaya - 03.03.2021 - photo Luis Alejandro Fuentes / via Conred

Pacaya - activity of 03.03.2021 / 08:43 - Doc. W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - activity of 03.03.2021 / 08:43 - Doc. W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - effusion on 03.03.2021 / 10:10 a.m. - W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - effusion on 03.03.2021 / 10:10 a.m. - W. Chigna / Insivumeh - Conred - Univ. Bristol

In Pacaya / Guatemala, the level of volcanic activity is increasing significantly.

Strong Strombolian explosions expel ballistic materials 800 meters above the Mackenney crater (see map of possible ballistic fallout), and develop a plume of ash and gas at 5,500 m. asl.

The dispersion of the ashes is towards the west for more than 170 km. And impacts the communities of El Rodeo, Rl Patrocinio, Los Jazmines, el Cedro, San Francisco de Sales, Calderas y San vincente Pacaya.

The lava flow reaches 400 meters on the southern flank.

 

Sources: Insivumah, Conred, Univ. Bristol

Pacaya - map of possible ballistic fallout as of 03.03.2021 - Doc. Insivumeh

Pacaya - map of possible ballistic fallout as of 03.03.2021 - Doc. Insivumeh

Pacaya from El Pedregal farm, Los Pocitos, Villa Canales on 04.03.2021 - photo Conred

Pacaya from El Pedregal farm, Los Pocitos, Villa Canales on 04.03.2021 - photo Conred

In the Reykjanes Peninsula, a tremor pulse was detected at 2:20 p.m. on March 3, 2021, and was observed at most seismic stations in Iceland. The pulse is located near Litli-Hrutur, halfway between Keilir and Fagradalsfjall.

Similar signals have been observed leading to rashes, but no rash has been confirmed. IMO is working on a more in-depth analysis of the tremor drive.

 Reykjanes peninsula - pulse of trémor on 03.03.2021 / 14h21 - Doc. IMO

Reykjanes peninsula - pulse of trémor on 03.03.2021 / 14h21 - Doc. IMO

An intense earthquake swarm began on the Reykjanes Peninsula on February 24 with an M5.7 and M5.0 earthquake. Since then, two earthquakes on M5.0 have been detected. They occurred on February 27 and March 1. About 18,000 earthquakes have been detected in the region since the start of the activity.

 

About 1,700 earthquakes have been detected since midnight. on March 3, the largest with a magnitude of 4.1 to. 2:12 am, but most of the earthquakes this afternoon are smaller, but the largest tonight at 8:17 pm was 3.8.

At 4:20 p.m., the measurements do not give clear indications on if and when the magma will reach the surface. Experts from the Meteorological Bureau are currently carrying out surveillance flights to see if silt depressions are forming in the area, indicating that the magma is very shallow.

As a precautionary measure for domestic and international air travel, the Reykjanes Peninsula volcanic aviation color code has been raised from yellow (high unrest) to orange (increased unrest). The orange alert represents the third highest level, with red reserved for an imminent or ongoing volcanic eruption.

Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO

Today March 4 at 12:59 am, an M4.1 earthquake was detected 1.4 km SE of Fagradalsfjall. Most of the activity since midnight has taken place near Fagradalsfjall and has drifted somewhat southwest compared to yesterday. Earthquake and earthquake activity decreased a bit overnight, but increased again around 5 am. 15-20 earthquakes above M3.0 have been detected since midnight.

Reykjanes Peninsula - area of ​​possible lava flow extension from a 2 km fissure. in length near Fagradalsfjall - Doc. IMO 03.03.2021

Reykjanes Peninsula - area of ​​possible lava flow extension from a 2 km fissure. in length near Fagradalsfjall - Doc. IMO 03.03.2021

Reykjanes - The location of a potential eruption on the Reykjanes Peninsula is in an uninhabited area, but the SO2 emitted could cause problems in neighboring towns and villages - IMO Map

Reykjanes - The location of a potential eruption on the Reykjanes Peninsula is in an uninhabited area, but the SO2 emitted could cause problems in neighboring towns and villages - IMO Map

As the area is uninhabited, potential volcanic eruptions are unlikely to threaten the settlements; Kelir's area was cordoned off, however. On the other hand, if there is an eruption, sulfur dioxide could impact populations both on the Rekjanes Peninsula and in Reykjavik.

 

Sources: IMO, ISOR & mbls

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The 8th paroxysm of Etna, this March 2, 2021, was largely masked by atmospheric conditions, only the top of the plume being observed.

Etna - strombolian activity at the SEC - 02.03.2021 / 10h54 - EMOT / INGV OE webcam

Etna - strombolian activity at the SEC - 02.03.2021 / 10h54 - EMOT / INGV OE webcam

From 10:45 UTC, there is a slight increase in the mean amplitude of the volcanic tremor, and the resumption of weak Strombolian activity at the southeast crater / SEC. Infrasound activity also shows an increase in the number of events.
From 11:34 GMT, Strombolian activity in the SEC increases, accompanied by the emission of ash which quickly disperse into the atmosphere. After a short stationary phase, the average amplitude of the volcanic tremor, around 11:30 GMT, started to increase again, the sources moving towards the south-eastern crater.

Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlargeEtna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge
Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge

Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge

From 12:24 GMT, a rapid increase in the amplitude of the volcanic tremor is observed, whose source is located at the southeast crater at about 3000 m. Infrasound activity is also supported both in the rate of occurrence and in the energy of events.

The strombolian activity of the south-eastern crater has turned into a lava fountain. Due to the cloud cover, it is not possible to make continuous observations.

The INGV OE announces that the activity of lava fountains at the SEC has ceased at 14:50 GMT. From 14:40 UTC, there was a rapid decrease in the average amplitude of the volcanic tremor which reached average values ​​at 15:00 UTC.

Etna - 03.02.2121 / 2:50 p.m. - EMOT / INGV OE webcam

Etna - 03.02.2121 / 2:50 p.m. - EMOT / INGV OE webcam

Etna - fluctuations in the tremor at 02.03.2021 / 2.10 p.m. the plot relating to the 8th paroxysmal episode on the right - Doc. INGV OE

Etna - fluctuations in the tremor at 02.03.2021 / 2.10 p.m. the plot relating to the 8th paroxysmal episode on the right - Doc. INGV OE

2021.03.02 - Etna - Emission of sulfur dioxide, with 14.90DU of SO2. - Sentinel- 5P Tropomi / DLR / BIRA / ESA

2021.03.02 - Etna - Emission of sulfur dioxide, with 14.90DU of SO2. - Sentinel- 5P Tropomi / DLR / BIRA / ESA

At 15:06 UTC, an ash fall was reported in the southern sector of the volcano. In particular in the areas of: San Gregorio (motorway exit); Trecastagni; Aci S. Antonio; Pedara and Catania.

 

Source: INGV OE

Klyuchevskoy - the cinder cone G.S. Gorshkov on 03.02.2021 - photo D. Melnikov via olga Girina

Klyuchevskoy - the cinder cone G.S. Gorshkov on 03.02.2021 - photo D. Melnikov via olga Girina

At Klyuchevskoy, the ash cone and the lava flow of the lateral rupture on the western flank remain active on March 2, 2021, marked by a thermal anomaly. The lateral rupture is named after Corr.- Member USSR Academy of Sciences G.S. Gorshkov.

A moderate emission of gas and vapor continues at the top of the volcano.

 

Source: Olga Girina / Photo by Dmitry Melnikov & KVERT

Piton de La Fournaise - the Dolomieu crater - photo archives © Bernard Duyck

Piton de La Fournaise - the Dolomieu crater - photo archives © Bernard Duyck

In February 2021, the OVPF recorded in the Piton de la Fournaise massif in total:

- 6 superficial volcano-tectonic earthquakes (0 to 2.5 km above sea level) under the summit craters;

- 1 deep earthquake (below sea level);

- 165 collapses (in the Dolomieu Crater, the ramparts of the Fouqué and Piton de Crac enclosures, and the East River).

 

The GPS in the summit area and in the far field did not record any particular signals, with the exception of the GPNG and GPSG stations located in the Grandes Pentes area. The GPNG and GPSG stations continued to record subsidence and eastward movement, although their movement slowed.

Since the last eruption, a continuous increase in CO2 emissions from the soil has been recorded at the level of the distal sites (Plaine des Cafres and Plaine des Palmistes sectors, but also proximal (Gîte du volcano).

 

Source: OVPF

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Sinabung - ash plume and pyroclastic flows on 03.02.2021 - photo Komunitas Beidar Sinabung - one click to enlarge

Sinabung - ash plume and pyroclastic flows on 03.02.2021 - photo Komunitas Beidar Sinabung - one click to enlarge

In Sinabung, in the province of Karo on Sumatra, from 6:42 a.m. to 8:20 a.m. WIB on March 2, 2021, there were 13 pyroclastic avalanche flows, with a sliding distance of 2,000 to 5,000 meters to the southeast, and the height of the ash column is more than 5,000 meters, the wind is weak to the west - southwest. Warm clouds reach the Lauborus River in the east-southeast sector.

The aviation code is red, before being reduced to orange.

Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge
Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlargeSinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge

Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge

Ash falls are found in various villages, with a thickness of 3 cm.

The Himawari-8 satellite picked up an ash cloud drifting west.

Ash falls are found in various villages, with a thickness of 3 cm.  The Himawari-8 satellite picked up an ash cloud drifting west.

Ash falls are found in various villages, with a thickness of 3 cm. The Himawari-8 satellite picked up an ash cloud drifting west.

Sumatra - Sinabung ash cloud seen by Himawari-8 on 02.03.2021 / 11h WIB - Doc. BMKG

Sumatra - Sinabung ash cloud seen by Himawari-8 on 02.03.2021 / 11h WIB - Doc. BMKG

Sinabung - plume and co-pyroclastic cloud 02.03.2021  - ANTARA FOTO  /Sastrawan Ginting

Sinabung - plume and co-pyroclastic cloud 02.03.2021 - ANTARA FOTO /Sastrawan Ginting

The seismicity of March 2 between 00 and 6 a.m. is characterized by:

- 1 eruption earthquake, with an amplitude of 40 mm, and the duration of the earthquake was 191 seconds.
- 13 earthquakes linked to pyroclastic flows, with an amplitude of 120 mm and an earthquake duration of 143-485 seconds.
- 35 collapse / avalanche earthquakes, with an amplitude of 10 to 65 mm and a duration of 22 to 160 seconds of the earthquake.
- 23 low frequency earthquakes, with an amplitude of 5 to 25 mm and the duration of the earthquake was 10 to 40 seconds.
- 1 remote tectonic earthquake
- 1 episode of continuous tremor with an amplitude of 2-5 mm, dominating 3 mm.

 

The activity level remains at 3 / siaga with prohibitions of 3 to 5 km. depending on the flanks concerned
 

Sources: PVMBG, Magma Indonesia, Beidar Sinabung, Nachelle Homestay, and local news agencies

THE PACAYA VOLCANO. The volcano prevention unit -UPV-, the strategic intervention team -EIE-, the immediate intervention team -ERI- and the CONRED I region, are deployed at different strategic points to check the conditions and coordinate actions with the hierarchical system of coordinators.

THE PACAYA VOLCANO. The volcano prevention unit -UPV-, the strategic intervention team -EIE-, the immediate intervention team -ERI- and the CONRED I region, are deployed at different strategic points to check the conditions and coordinate actions with the hierarchical system of coordinators.

In the early hours of March 1, 2021, Insivumeh recorded a notable increase in the internal seismic activity of the Pacaya, corresponding to an increase in Strombolian activity.

 

Pacaya - increased RSAM - Insivumeh

 

According to observers of the observatory, explosions expel ballistic materials to a height of up to 500 meters above the crater; this activity is accompanied by a plume of ash and gas at 3,500 m. asl., moving west and southwest.

Ash falls are observed in El Patrocinio, with possibilities in Los Rios, Los Jazmines El Rodeo, San José, and the municipalities in the same direction.

To be continued

 

Source: Insivumeh

Sabancaya- activity from 22 to 28.02.2021 - Doc. I.G. Peru

Sabancaya- activity from 22 to 28.02.2021 - Doc. I.G. Peru

The eruptive activity of Sabancaya between February 22 and 28 remains at moderate levels, with an average of 91 daily explosions, and the observation of plumes of ash and gas up to 2,000 meters above the summit.

During this period, I.G. Peru recorded 1977 earthquakes of volcanic origin, associated with the circulation of internal fluids. VT earthquakes, of magnitude between 1.9 and 2.8, occur mainly north of the volcano.

The deformations do not present any significant anomalies, except for slight inflation in the north. The satellites did not identify any thermal anomaly.

 

The volcanic alert remains in Naranja, with an inaccessible area of ​​12 km. radius

 

Source: I.G.P.

Reykjanes peninsula - surroundings of Fagradalsfjall - Doc. Skjáskot Iceland 360 VR via mbls

Reykjanes peninsula - surroundings of Fagradalsfjall - Doc. Skjáskot Iceland 360 VR via mbls

New data provides reason to take a closer look at the magma intrusion scenario beneath the Fagradalsfjall area on the Reykjanes Peninsula.

Mount Fagradalsfjall, the westernmost part of the Reykjanes Peninsula's mountain ridge, is actually a small plateau. Some hyalocaslite ridges protrude, especially in the western part. Its highest altitude is 385 m. above sea level.

Reykjanes Peninsula - Fagradalsfjall - wrapped icelandic InSAR 23 feb. to1 ° Tue. - Doc.IMO

Reykjanes Peninsula - Fagradalsfjall - wrapped icelandic InSAR 23 feb. to1 ° Tue. - Doc.IMO

I reproduce the IMO update from 03/01/2020 at 6:15 p.m.:

“The Scientific Council for Civil Protection met in a teleconference today to discuss the earthquake on the Reykjanes Peninsula. The meeting was attended by representatives of the Icelandic Meteorological Office, University of Iceland, Environment Agency, Isavia-ANS, HS-Orka and ÍSOR.

It was stated at the meeting that the Meteorological Bureau's automatic seismic system has measured around 1,800 earthquakes since midnight and that they are mostly confined to the SW area of ​​Keilir and Trölladyngja. Of those 1,800, 23 earthquakes of magnitude 3 or greater and about 3 earthquakes are of magnitude 4 or greater. The largest of midnight was measured at 4:35 p.m., with a size of 5.1 and it came from about 1 km ASA through Keilir.

The Scientific Council also reviewed the satellite images (InSAR) received today. Excerpts from these images show more entries than has been previously seen in the region in recent days. The most likely explanation is that magma is forming under the area where the greatest seismic activity has taken place in recent days. These new data will be better processed, for example by means of a model, in order to better inform the course of events.

In light of this new data which was discussed at a Scientific Council meeting today and which has been reviewed by experts, it is important to take a closer look at the magma intrusion scenario beneath the area. by Fagradalsfjall.
 

The possible scenarios are:

1. Seismic activity will decrease in the coming days or weeks.
2. The eruption will increase with larger earthquakes, up to magnitude 6 near Fagradalsfjall
3.An earthquake with a magnitude of up to 6.5 will have its source in the Sulfur Mountains.
4. Magma intrusions continue near Fagradalsfjall with either:
- The magma intrusion activity decreases and the magma solidifies
- they lead to a lava flow which will probably not threaten the colonies.


Current activity on the Reykjanes Peninsula is divided into chapters and it is difficult to predict the exact development and whether one scenario is more likely than another. New data is expected later this week that could further shed light on the reasons for this crash. The Scientific Council will meet again tomorrow to make a new assessment of the available data as well as to assess new measures. "

 

Sources: IMO & mbls

Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35
Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35
Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35

Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35

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Publié dans : #volcanic activity

After a small calm of a few days, Strombolian activity resumed at the southeast crater of Etna on February 28 at around 7.45 am local time, with a sudden increase in the tremor.

The images taken by the thermal cameras of Monte Cagliato (east side of Etna) and Montagnola (high southern slope) show the speed with which the phenomena developed, from the first small explosions to the sustained lava fountains, with the creation of a subplinal eruptive column.

Etna "on pause" this 02/26/2021 / 09:50 - image Sentinel 2 bands 4,3,2 + bands 12,11,8A via Mounts project

Etna "on pause" this 02/26/2021 / 09:50 - image Sentinel 2 bands 4,3,2 + bands 12,11,8A via Mounts project

Etna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlargeEtna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlarge

Etna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlarge

Etna - paroxysmof 02/28/2021- INGV OE

Etna SEC - subplinal eruptive column - photo kindly shared by © Pippo Scarpinati

Etna SEC - subplinal eruptive column - photo kindly shared by © Pippo Scarpinati

Strombolian activity, characterized by a continuous jet, was mainly concentrated in two vents and reached an initial height of about 300 m. An overflow feeds a lava flow towards the Valle del Bove.

At 10:20 a.m. local time, a sudden decrease in tremor to medium-low values ​​was observed. The source of the quake remains in the area of ​​the SE crater at a depth of about 2,600 m above sea level.

At 10:33 a.m. local time, the SEC fountain stopped almost suddenly, while the lava flow to the Valle del Bove remained active.

Etna - the impressive plume of the 7th paroxysm at 09:50 UTC, or 1:30 after the start of the broadcast; the overflow and the lava flow are also visible - image Sentinel2 28,02,2021 / via Copernicus / Directorate-General for Defense Industry and Space l DG DEFIS - one click to enlarge

Etna - the impressive plume of the 7th paroxysm at 09:50 UTC, or 1:30 after the start of the broadcast; the overflow and the lava flow are also visible - image Sentinel2 28,02,2021 / via Copernicus / Directorate-General for Defense Industry and Space l DG DEFIS - one click to enlarge

Etna - sulfur dioxide anomaly on 28,02,2021, with 149.02DU of SO2 at an altitude of ~ 11km. Estimated mass within 300 km of 15.1ktons. - Doc. Tropomi / DLR-BIRA-ESA

Etna - sulfur dioxide anomaly on 28,02,2021, with 149.02DU of SO2 at an altitude of ~ 11km. Estimated mass within 300 km of 15.1ktons. - Doc. Tropomi / DLR-BIRA-ESA

Etna - amplitude of the tremor at 02/28/2021 / 10:10 a.m. - Doc. INGV OE

Etna - amplitude of the tremor at 02/28/2021 / 10:10 a.m. - Doc. INGV OE

A resumption of Strombolian activity in the SEC, accompanied by the emission of ash is observed from 11:20 a.m., with a further increase in the average amplitude of the volcanic tremor ... to drop around 12 p.m.

The source of the tremor is still located in the area of ​​the SE crater, at a depth of about 2500 m above sea level, while showing a gradual slide towards the other summit craters, during the last hours.

 

Source: INGV & Boris Behncke

Etna - the flow and the projections cool, while the other craters degassing - webcam INGV Emot0327 on 02.28.2021 / 4:10 p.m.

Etna - the flow and the projections cool, while the other craters degassing - webcam INGV Emot0327 on 02.28.2021 / 4:10 p.m.

Analysis of Stromboli camera footage revealed explosive footage in the North Zone, which began with three events of lesser intensity at 1:32:50, 1:33:00 and 1:33:10 UTC, respectively.

After approximately ten seconds, a major explosion occurred at 1:33:30 UTC lasting approximately 10 seconds and ended at 1:34:00 UTC.
This latter activity produced a fall of coarse material along the Sciara del Fuoco and part of the material fell in the direction of Pizzo.

 

From the seismic point of view, after the phase of increasing the amplitude of the tremor, which followed the explosive sequence, the values ​​returned to the standard around 01:37 UTC approximately. No significant change is observed in the frequency of occurrence of explosive events.
The strain data does not show significant changes.

 

Source: INGV

Stromboli - 01.03.2021 / 01h33 - webcam therm. INGV OE

Stromboli - 01.03.2021 / 01h33 - webcam therm. INGV OE

The Pacaya maintains weak to moderate explosions on February 28, characterized by sporadic expulsions of incandescent material 150 meters above Mackenney crater, and an ash plume dispersing westward, with fallout reported to Patrocinio.

Its effusive activity feeds a lava flow towards the SSO, of 1,750 meters long.

Insivumeh recalls the ban on access to the Mackenney and the flow areas, due to their instability, their high temperature and the gases emanating from them.

 

Source: Insivumeh

Volcan De Pacaya - Finca El Caracol neighbors share this beautiful photo of the lava flow during the night of February 27-28 - Doc. DisastersGT

Volcan De Pacaya - Finca El Caracol neighbors share this beautiful photo of the lava flow during the night of February 27-28 - Doc. DisastersGT

In Klyuchevskoy, the fissure eruption on the northwest flank, which began late in the day on February 17, continues with the formation of a cinder cone.

In the first days of the eruption, a lot of pyroclasts were expelled by the gases and its growth was rapid.

Then with the arrival of a magma less saturated with gas, the eruption passed to a more effusive phase, slowing down the growth of the cone; it begins to collapse in the lava flow which emanates from it.

 

Source: Сергей Самойленко

Klyuchevskoy- the growing cinder cone on the active crack of the NW flank - photo Сергей Самойленко / 02.28.2021

Klyuchevskoy- the growing cinder cone on the active crack of the NW flank - photo Сергей Самойленко / 02.28.2021

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

A moderate eruptive activity continues at Ebeko, with this February 27 an explosion accompanied by an ash plume at more than 2,500 meters asl, then drifting 3 km to the southwest of the volcano

The aviation code remains orange, with other explosions potentially affecting low-altitude flights and Severo-Kurilsk airport.

 

Sources: KVERT, VAAC Tokyo and Toppress

Ebeko - gas plume and ash - photo Toppress 02.27.2021

Ebeko - gas plume and ash - photo Toppress 02.27.2021

The VAAC Darwin issued an orange VONA on February 28 for the Sinabung, following a discreet emission of ash up to an altitude of flight 110, with extension to the southwest.

The seismicity of February 27 is characterized by:

- 29 collapse / avalanche earthquakes, with an amplitude of 3 to 120 mm and a duration of 35 to 161 seconds of the earthquake.
- 3 blast earthquakes, with an amplitude of 13 to 16 mm and the earthquake lasted 15 to 45 seconds.
- 189 low frequency earthquakes with an amplitude of 3 to 10 mm and the duration of the earthquake was 6 to 30 seconds.
- A distant tectonic earthquake.

The activity level remains at 3 / siaga.

 

Sources: VAAC Darwin, Nachelle homestay

Sinabung - 02/28/2021 / 6:53 am - photo Nachelle homestay

Sinabung - 02/28/2021 / 6:53 am - photo Nachelle homestay

The Sakurajima experienced this February 28 at 10 a.m. JST an explosion, accompanied by a plume rising to 1,500 m. above the Minamidake crater, with dispersion towards the northwest.

The JMA reports that large volcanic bombs were scattered between 800 and 1,000 m. from the crater.

 

Source: JMA

February 28, 2021, ~ Explosion ~ 桜島 Sakurajima Volcano, Japan ~ 10:00 JST

In Kilauea, lava from the West Vent continues to feed the lava lake in Halema'uma'u Crater.

The active western half of the lava lake measured approximately 217 m. depth, measured by a remote laser rangefinder on the morning of February 27, 2021.

Observations yesterday afternoon indicated that lava effusion continues at the western fissure. The lava quickly develops a thin crust as it flows outward to the east with occasionally a crust sinking between the vent and the main island, but not beyond the island.

Stagnant (solidified) lake crust covers the eastern half of the lake and slowly grows west around the main island. The position and dimensions of the main island and the smaller islands have not changed due to the solidified crust. Some minor scree debris collects on the lava surface around one or two of the islands as their edges cool, crack and begin to crumble.
 

Source: HVO

Kilauea / Halema'uma'u crater - map of summit eruptive activity - Doc. HVO-USGS

Kilauea / Halema'uma'u crater - map of summit eruptive activity - Doc. HVO-USGS

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  Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

 Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

Sinabung - seismicity at 02.26.2021 - note a gradual increase over the past month - Doc. Magma Indonesia

Sinabung - seismicity at 02.26.2021 - note a gradual increase over the past month - Doc. Magma Indonesia

Sinabung's main crater emits a thin, white plume about 50-200 meters from the summit.

The seismicity of February 26 is broken down into:

- 111 collapse / avalanche earthquakes, with an amplitude of 2 to 120 mm and an earthquake duration of 25 to 250 seconds.
- 31 emission earthquakes, with an amplitude of 3 to 27 mm and the earthquake lasted 12 to 110 seconds.
- 373 low frequency earthquakes, with an amplitude of 2 to 11 mm, and the duration of the earthquake was 5 to 26 seconds.
- a local tectonic earthquake.

 

The activity level remains at 3 / siaga /
Communities and visitors / tourists not to conduct activities in the villages that have been displaced, as well as the location within a radial radius of 3 km from the summit of G. Sinabung, as well as within a sector radius of 5 km for the south-eastern sector, and 4 km for the east-north sector.

 

Sources: PVMBG, Magma Indonesia 

Taal - everything seems calm on 02.26.2021 - photo Phivolcs

Taal - everything seems calm on 02.26.2021 - photo Phivolcs

During the last 24 hours, the Taal volcanic monitoring network recorded twenty-eight (28) volcanic earthquakes and one hundred and thirty (130) episodes of volcanic tremor lasting from one (1) to five (5) minutes. . Despite this, only weak steam-laden plumes were emitted by fumarole activity at the vents of the main crater. Elevated temperatures of 74.6 ° C and a pH of 1.59 were last measured from the main crater lake on February 18 and 12, 2021, respectively. The ground deformation parameters of the continuous electronic tilt on the volcano island have recorded slight deflation around the main crater since October 2020, but overall, very slow and steady inflation of the Taal region was recorded by continuous GPS data after the eruption.

Alert level 1 (abnormal) is maintained on the Taal volcano. DOST-PHIVOLCS reminds the public that at Alert Level 1, sudden steam or phreatic explosions, volcanic earthquakes, minor ash falls and fatal accumulations or expulsions of volcanic gas can occur and threaten areas of the volcanic island of Taal (TVI). DOST-PHIVOLCS strongly recommends that entry into TVI, the Taal Permanent Danger Zone or PDZ, especially around the main crater and Daang Kastila fissure, remain strictly prohibited.
 

Source: Phivolcs

Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO

An intense earthquake swarm began on the Reykjanes Peninsula at 10 a.m. on February 24 with an M5.7 earthquake followed by an M5.0 Earthquakes were widely felt in the southwestern part of the country, in the north-west of Iceland to Ísafjörður.

About twenty earthquakes of M4 and more have been recorded and more than 100 on M3. Earthquake rate decreased on February 25

Since noon on the 26th it started to increase again and several earthquakes above M4 were recorded. The largest earthquake on February 26 was M4.9 at 10:38 p.m. This was widely felt in the SW eg. in Vestmanneyjar, Borgarfjörður, Rangárþing. Three earthquakes on M3.0 were detected around 2:30 a.m. The largest was M3.8 and was felt in the southwest and west of Iceland.

Such intense swarms are not unheard of eg. on June 10, 1933, five earthquakes M4.9-M5.9 were recorded at Fagradalsfjall.

The swarm is still ongoing and since February 23, the SIL system has detected more than 6,000 earthquakes in the region.
 

Source: IMO

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