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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
 Etna Northeast crater - ash emission on 07.26.2021 / 8.50 p.m. GMT - photo © Pippo Scarpinati, da Sant'Alfio.

 Etna Northeast crater - ash emission on 07.26.2021 / 8.50 p.m. GMT - photo © Pippo Scarpinati, da Sant'Alfio.

From 18:20 UTC, a continuous emission of ash is observed at the level of the northeast crater of Etna. In the absence of wind, the ash plume reaches a height of about 6,000 m above sea level.

The minor event produced no incandescence, infrasound, or significant tremor signal. It ended after two hours.

 

Sources: INGV OE, Boris Behncke and Pippo Scarpinati

Etna crater Northeast - ash emission on 07/26/2021 - photo Boris Behncke

Etna crater Northeast - ash emission on 07/26/2021 - photo Boris Behncke

Etna - ash emission on 07/26/2021 / 8:50 p.m. - LAVE webcam Schiena del Asino

Etna - ash emission on 07/26/2021 / 8:50 p.m. - LAVE webcam Schiena del Asino

In Iceland, the activity of Fagradalsfjall continues. A glow is visible on the webcam at the level of the active cone from 00h until 6.30am. this 27 july . However, the amount of lava is slowly decreasing overall.

Culture Minister Lilja Dögg Alfreðsdóttir has officially confirmed the name of the newly created landscape around the volcanic eruption on the Reykjanes peninsula. The lava field will be called Fagradalshraun.

 

Sources: webcam & Iceland review

Fagradalsfjall - 27.07.2021 / 06:30 - webcam_langihryggur NV

Fagradalsfjall - 27.07.2021 / 06:30 - webcam_langihryggur NV

Fagradalsfjall - tremor at 27.07.2021 - Doc. Hraun.vedur

Fagradalsfjall - tremor at 27.07.2021 - Doc. Hraun.vedur

The IGEPN reports the activity observed at the Reventador on July 16:

a degassing plume (gas and ash) is observed up to 700 meters above the level of the crater, dispersing towards the west. The VAAC issued an emission alert observed in satellites 688 meters above the crater level in a northeast direction.
FIRMS records 3 thermal alerts and MIROVA records 1 low thermal alert in the last 24 hours.
At night, an incandescence was observed in the upper part of the volcano, in addition to the rolling of incandescent blocks up to 700 meters below the level of the crater on the northeast flank.

Reventador - 07.25.2021 / 6:50 p.m. local - webcam Copete IGEPN

Reventador - 07.25.2021 / 6:50 p.m. local - webcam Copete IGEPN

Light rains were recorded which generated signals associated with the decrease in mudslides and debris (lahars) at the Sangay volcano. This phenomenon has been recurring since the start of the activity in May 2019 and is due to the rains in the volcano remobilizing abundant volcanic materials accumulated in recent weeks.

As a precaution, it is recommended not to enter or approach the canals of the Volcán and Upano rivers.
The VAAC reported 4 emission alerts observed in satellites with altitudes of up to 870 meters above crater level to the west.
No thermal alerts have been recorded in the last 24 hours.

 

Source: IGEPN

Sabancaya - activity from July 19 to 25, 2021 (bifid plume) - photo I.G. Peru

Sabancaya - activity from July 19 to 25, 2021 (bifid plume) - photo I.G. Peru

The eruptive activity of the Sabancaya volcano remained at moderate levels from July 19 to 25, 2021, an average of 58 daily explosions, accompanied by plumes of ash and gas up to 2,300 m above the summit of the volcano.

The IGP recorded and analyzed 1,176 earthquakes of volcanic origin, associated with the circulation of magmatic fluids within the Sabancaya volcano. During this period, Volcano-Tectonic (VT) earthquakes associated with rock fracturing were located mainly in the North, North-East, North-West and South-West of Sabancaya, of magnitudes between M1, 8 and M3.9.

The monitoring of the deformation of the volcanic structure using GNSS techniques (processed with fast orbits) does not present any significant anomalies. However, an inflation process was observed in the northern sector (around the Hualca Hualca volcano).

Satellite recordings have identified the presence of 9 thermal anomalies ((maximum value of VRP 162 MW on 07/24 - Mirova) associated with the presence of a lava body on the surface of the volcano's crater.

 

Source: I.G. Peru.

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
  Fagradalsfjall - night activity 25.07.2021 - mbls webcam

 Fagradalsfjall - night activity 25.07.2021 - mbls webcam

Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV
Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV

Fagradalsfjall - 25.07.2021, respectively at 7.40 p.m. and 10.00 p.m. - webcam_langihryggur NV

In Fagradalsfjall, the eruption remains active, with a strong spattering between 5 p.m. on July 25 and 2 a.m. on July 26, before the fog obscures the site.

The oscillations of the tremor seem more regular for a few days.

 

Sources: Jarðvísindastofnun Háskólans, Hraun.vedur webcams mbls, RUV and Visir

Fagradalsfjall - tremor at 26.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 26.07.2021 - Doc. Hraun.vedur.is

Persistent nighttime glow observations on Whakaari / White Island web cameras indicate continued high temperature gas emission. Observation of the night glow on web cameras continued from June 30 until today. Last week's thermal infrared (IR) observation and measurement flight reported the emission of very hot gas (498-654°C) from some of the 2019 lava extrusion vents.
The continued drop in the carbon dioxide / sulfur dioxide ratio indicates continued degassing of fresh magma.

 

The volcanic alert level has been raised to 2 and the aviation color code to yellow.
While Volcanic Alert Level 2 is primarily associated with the risks of volcanic unrest (including releases of hot volcanic steam and gases, earthquakes, landslides, and hydrothermal activity), there are also Risk of rash and rashes can always occur with little or no warning.

 

Source: GeoNet / Volcanic alert bulletin 26,07,2021

Whakaari / White island - volcanic alert level 2 code aviation yellow - Photo GeoNet 26.07.2021

Whakaari / White island - volcanic alert level 2 code aviation yellow - Photo GeoNet 26.07.2021

At Merapi, on Java, the main crater plume is observed white in color with high intensity about 100 meters from the summit.

At the seismicity level, the PVMBG reports:

- 156 Avalanche earthquakes with an amplitude of 3 to 31 mm and a duration of 12.9 to 161.2 seconds.
- 17 blast / emission earthquakes with an amplitude of 3 to 10 mm and the duration of the earthquake from 9.5 to 31.7 seconds.
- 185 hybrid / multiphase earthquakes with an amplitude of 3-22 mm, S-P 0.2-0.9 seconds and an earthquake duration of 5.5 to 11.5 seconds.
- 69 shallow volcanic earthquakes with an amplitude of 22 to 78 mm and a duration of 6.4 to 35.1 seconds.
- 2 distant tectonic earthquakes.

 

Sources: PVMBG, Magma Indonesia and BPPTKG

Merapi - 07.25.2021 / 11:34 pm - webcam Magma Indonesia

Merapi - 07.25.2021 / 11:34 pm - webcam Magma Indonesia

Merapi from Kemalang - 07.26.2021 / 06:11 - photo Sukiman Lintas Merapi

Merapi from Kemalang - 07.26.2021 / 06:11 - photo Sukiman Lintas Merapi

Merapi - seismicity at 25.07.2021 - Doc. BPPTKG

Merapi - seismicity at 25.07.2021 - Doc. BPPTKG

" The Volcanological Observatory of Goma (OVG) informs the entire population of Goma and its surroundings that this Saturday, July 24, 2021 afternoon, a fall of dust / volcanic ash over a large part of the surrounding area is observed from the Nyiragongo volcano.

These ashes come from the collapse of part of the crust of the central crater of the Nyiragongo volcano. This event has no relation to a certain eruptive activity of the volcano which could worry the public.

The OVG then asks everyone to observe the rules of hygiene by carefully covering food and dishes as well as to reserve the use of rainwater as drinking water. "

 

Source: The Director General of the OVG, Prof Dr MUHINDO SYAVULISEMBO Adalbert

Nyiragongo - the crater seen at night on 06.12.2021 - Photo by Arsène T. Sadiki via Ch.Balagizi

Nyiragongo - the crater seen at night on 06.12.2021 - Photo by Arsène T. Sadiki via Ch.Balagizi

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

At least 21,780 people have been displaced by the lingering unrest at Taal Volcano over the past two weeks.
The National Council for Disaster Risk Reduction and Management said 6,000 people were still evacuated, while around 16,000 people remained with friends or relatives. The affected residents are from 145 barangays.
Aid worth around 16 million pesos was distributed to evacuees, including family food packages and non-food items such as hygiene and family kits and tents.

Taal volcano island - alert level 2 - photo Philstar

Taal volcano island - alert level 2 - photo Philstar

After the phreatomagmatic eruption in the main crater on July 1, 2021 and nineteen (19) weak phreatomagmatic bursts recorded until July 9, 2021, there was a slowdown in the volcanic activity of Taal. Current turbulence includes renewed seismic activity, a general decrease in volcanic gas evaporation, slow volcanic deflation, and positive anomalies using microgravity. These observations are based on the following signs:

As of July 1, 2021, the volcanic earthquakes recorded by the Taal Volcano Network (TVN) have a total number of 1,201 and have associated forces ranging from M1.8 to M4.6. These include 789 volcanic earthquakes, 365 low frequency events, 27 hybrids and eight (8) volcano-tectonic earthquakes caused by magmatic activity and the hydrothermal region under the volcanic island of Taal (TVI). Most of the earthquakes originated under the main crater and the northeastern part of the TVI indicates the movement of shallow degassed magma, volcanic gas, and hydrothermal fluids in this part of the volcano.

Taal - RSAM and daily earthquakes at 23.07.2021 - Doc. Phivolcs - one click to enlarge

Taal - RSAM and daily earthquakes at 23.07.2021 - Doc. Phivolcs - one click to enlarge

Taal - sulfur dioxide flow at 23.07.2021 - Doc. Phivolcs - one click to enlarge

Taal - sulfur dioxide flow at 23.07.2021 - Doc. Phivolcs - one click to enlarge

The sulfur dioxide flow, measured by Flyspec, averaged 12,161 tonnes / day during the first week of July 2021, with a max. of 22,628 tonnes / day on July 4.

Since July 8 and July 22, the sulfur dioxide rate has fallen to 4,763 tonnes / day.

 

Soil deformation data confirms that hydrothermal activity is taking place below the Taal Fracture Zone, and magma is flowing from the southeastern part to different parts of Taal Volcano Island.

 

In accordance with these criteria, the Phivolcs reduced the alert level from 3 to 2 for the Taal. At Alert Level 2, sudden explosions of steam or gas, volcanic earthquakes, minor ash falls and fatal accumulations or expulsions of volcanic gas can occur and threaten areas in and around TVI. DOST-PHIVOLCS strongly recommends that entry be strictly prohibited on the island of Taal Volcano, the Permanent Danger Zone or PDZ of Taal, especially the surroundings of the main crater and Daang Kastila fissure, as well as the occupation and sailing on Taal Lake.

 

Source: Phivolcs

Turrialba - formation of 2 lakes close to the active crater - Doc. Ovsicori 07/24.2021

Turrialba - formation of 2 lakes close to the active crater - Doc. Ovsicori 07/24.2021

At 11:30 a.m. local time on July 23, 2021, a one-minute eruption was recorded at the Turrialba volcano.

Due to cloud cover, there were no visual observations, but ashfall was reported 3.5 km west of the volcano. This eruption occurred a few hours after the start of a rainy event. The rain is still on the region.

A note: 2 lakes formed near the active crater, under the effect of these heavy rains.

The H2S / SO2 ratio was measured yesterday; it shows a slight decrease compared to the previous week.

 

Source: Ovsicori

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Fagradalsfjall / Meradalur - 07.21.2021 / 8.30am - webcam mbls

Fagradalsfjall / Meradalur - 07.21.2021 / 8.30am - webcam mbls

Further measurements were made at Fagradalsfjall / Reykjanes Peninsula on Monday July 19, when the plane equipped with an Isavia radar altimeter took profile measurements of the lava. In addition, data from the Pléiades satellite of July 2 has been received. Terrestrial models have been made based on these measurements and they are compared to data from June 26.

Eruption at Fagradalsfjall - parameters of the eruption on 19.07.2021 - Doc. Jarðvisindastofnun Háskólans

Eruption at Fagradalsfjall - parameters of the eruption on 19.07.2021 - Doc. Jarðvisindastofnun Háskólans

The average lava flow over the period from June 26 to July 2 (6 days) was a little over 10 m³ / s but from July 2 to 19 (17 days) the average flow was 7.5 m³ / s.

Volcanic activity changed at the end of June. Then the activity began to fluctuate between periods of strong lava flow, interspersed with periods of calm. Current measurements show that the lava flow has diminished considerably. The rash is therefore clearly on the decline.

The lava volume is now 96 million cubic meters, and the area of ​​the lava field is just under 4 square kilometers. The increase in area has been very small over the past three weeks, as lava has mainly accumulated in the Meradalir valleys and on the western slope of these. During the past two weeks, no lava has flowed in Geldingadalur, Nátthaga and Syðri Meradalir.

2021.07.21 Fagradalsfjamm - thermal anomalies in Meradalur - image Sentinel-2 bands 12,11,4 from 21.07.2021 - one click to enlarge

2021.07.21 Fagradalsfjamm - thermal anomalies in Meradalur - image Sentinel-2 bands 12,11,4 from 21.07.2021 - one click to enlarge

Over the past three weeks the flow has decreased, indicating that the pressure in the system is now decreasing. However, it is too early to try to predict how long the rash will last.

 

Source : http://jardvis.hi.is/eldgos_i_fagradalsfjalli, mbls, Hraun.vedur

Fagradalsfjall - tremor variations at 07.24.2021 - Doc Hraun.vedur.is

Fagradalsfjall - tremor variations at 07.24.2021 - Doc Hraun.vedur.is

Fagradalsfjall - Meradalur - Iceland Volcano Timelapses

Merapi activity report July 16-22, 2021

This week, lava avalanches were observed 62 times in the southeast with a maximum slide distance of 1,200 m, 101 times in the southwest with a maximum slide distance of 1,800 m, 2 times in the west with a maximum sliding distance of 1,500 m, and once to the north-west with a glide of 500 m.

Avalanches observed on the west side are old lava from 1992 and 1998, and avalanches leading to the northwest are old lava from 1948.

MMerapi - photo PGM  Babadan / BPPTKG

MMerapi - photo PGM Babadan / BPPTKG

Morphological analysis of the Tunggularum Camera Station shows that the volume of the dome in the southwest sector is 1,880,000 m³. While the analysis of the Deles3 Camera Station shows the volume of the central dome of 2,808,000 m³.

The deformation of Mount Merapi, which was monitored using EDM this week, showed a distance shortening rate of 7cm / day.

 

The volcanic activity of Mount Merapi is still quite high in the form of effusive eruption activity. The state of the activity is defined in level 3 / siaga.

The current potential danger consists of lava avalanches and hot clouds in the southeast-southwest sector for a maximum of 3 km to the Woro River, and 5 km to the Gendol, Kuning, Boyong rivers. , Bedog, Krasak, Bebeng and Putih.

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

 

Source: BPPTKG

 Great Sitkin - image archives 06.17.2021 @AlaskaAir pilot Dave Clum / AVO

Great Sitkin - image archives 06.17.2021 @AlaskaAir pilot Dave Clum / AVO

A satellite radar image from last night on July 22 at 9:32 p.m. (July 23 05:32 UTC) shows a small area of ​​uplift about 50 m (~ 150 ft) in diameter at the center of Great Sitkin crater suggesting a magma rise near the surface. This lava dome-like feature appears to have been in place between July 14-22. As a result, AVO is increasing the Aviation Color Code to Orange and the Volcanic Alert Level to Watch.

Seismicity has been at relatively low levels this week compared to last week and we suspect the lava dome feature was put in place last week. Moderately high surface temperatures consistent with this feature were observed in satellite data on July 22. Cloudy conditions have obscured satellite views of the volcano for most of the past week. AVO will continue to closely monitor this new uplift feature.

The prognosis for eruptive activity is uncertain. Continued growth of the Lava Dome characteristic, additional explosive events, or a return to non-eruptive behaviors are all possible. The AVO will report significant changes and observations in the surveillance data if they occur.

 

Source: AVO

Semisopochnoi - steam emissions on 07.21.2021 / 11:04 p.m. DKT - AVO webcam

Semisopochnoi - steam emissions on 07.21.2021 / 11:04 p.m. DKT - AVO webcam

The Semisopochnoi was downgraded from the Aviation Orange color code to YELLOW on 07/21/2021 at 4:28 p.m.

Seismicity is greater than background noise, but no evidence of explosive activity was detected in the seismic or infrasound data. No activity was observed in the cloudy satellite views, but strong vapor emission from the active vent was observed on the web camera images from the night of July 22.

This summer's fieldwork restored remote access to Semisopochnoi's cameras and seismic stations on the island, which is useful for keeping tabs on one of the most remote active volcanoes in Alaska in the far west of the Aleutian Islands.

The Semisopochnoi aviation code remains in YELLOW, and the volcanic alert in Advisory.

 

Source: AVO

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Karymsky - ash emission - photo A.Reznikov 09.07.2021 / IVS FEB RAS

 Karymsky - ash emission - photo A.Reznikov 09.07.2021 / IVS FEB RAS

For 3 days (July 21 to 23), a moderate activity has continued at the Karymsky.

According to Himawari-8 satellite data from KVERT, ash emission continues continuously. The explosions send ash between 1,300 and 1,600 meters above sea level, and the ash plume extends 50-100 km east-northeast of the volcano.

Ash explosions up to 6-7 km altitude could occur at any time. The current activity could affect low-flying planes, and justify the orange aviation code.

 

Sources: KVERT, VAAC Tokyo, and Mirova

Ili Lewotolok - 23.07.2021 / 07:26 WITA - webcam PVMBG

Ili Lewotolok - 23.07.2021 / 07:26 WITA - webcam PVMBG

Mount Ili Lewotolok continues its activity, with on Friday July 23, 2021 at 07:26 WITA, an explosion accompanied by a plume of thick and gray ash observed at ± 800 m above the summit (± 2223 m above the level of the sea) to the west. This eruption was recorded on a seismograph with a maximum amplitude of 11 mm and a duration of 39 seconds.

However, there has been a relative decrease in seismicity for a few days.

Source: Magma Indonesia

Ili Lewotolok - seismicity at 07.22.2021 - Doc. Magma Indonesia

Ili Lewotolok - seismicity at 07.22.2021 - Doc. Magma Indonesia

The south-eastern crater of Etna, taking a "break" for 3 days, allowed a site visit on July 22. According to boris Behncke, " its cone has become incomprehensible and is most likely now the new summit of the volcano. A few small explosions made the investigation more ... exciting."

 

Source: Boris Behncke

The cone at the south-eastern crater of Etna, the highest point ? - photo Boris Behncke 07.22.2021

The cone at the south-eastern crater of Etna, the highest point ? - photo Boris Behncke 07.22.2021

Etna - ash explosion on 07.22.2021 - photo Boris Behncke

Etna - ash explosion on 07.22.2021 - photo Boris Behncke

On Big Island / Hawaii, Mauna Loa volcano remains in a state of low unrest.

Seismicity rates at the summit remain slightly above long-term background levels, with 38 low-magnitude earthquakes (below M2.5) recorded below the summit and upper flanks over the past week. of Mauna Loa. The majority of these earthquakes occurred at shallow depths below 8 kilometers below sea level.

Monitoring of soil deformation, gas releases and visual monitoring show no significant changes.

 

The volcanic alert level remains at advisory, and the aviation code at Yellow.

 

Source: HVO

The new MKcam is positioned on Mauna Kea with a southerly view of the summit of Mauna Loa and the Northeast Rift Zone. The MKcam view also includes elements of the East Rift Zone and Kīlauea Summit, including Kānenuiohamo, Maunaulu, and the Halema'uma'u plume. Kūlani, a cone over the northeastern Mauna Loa fault zone, is also visible in the image. -  USGS webcam image. / 29.05.2021

The new MKcam is positioned on Mauna Kea with a southerly view of the summit of Mauna Loa and the Northeast Rift Zone. The MKcam view also includes elements of the East Rift Zone and Kīlauea Summit, including Kānenuiohamo, Maunaulu, and the Halema'uma'u plume. Kūlani, a cone over the northeastern Mauna Loa fault zone, is also visible in the image. - USGS webcam image. / 29.05.2021

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The activity of the Sirung volcano saw an increase which was observed visually from the phreatic eruption that occurred on July 21, 2021 from 4:44 p.m. WITA to approximately 6:00 p.m. WITA, which emitted white-gray gas and ash with light to medium intensity. The maximum height of the plume reached about 2000 meters above the summit, with a dominant direction to the north.

The increase in the amplitude of the tremor lasted about 10 hours on July 21, 2021 before the ash was released, but volcanic earthquakes indicating movement of magma from the depth were not recorded and the amplitude of the tremor did not show a significant increase.

The phreatic eruption that occurred was the result of the interaction between the heat of the magma and the hydrothermal system of Mount Sirung.

Mount Sirung's activity level was raised to Level II (waspada) on July 21, 2021 at 9:00 p.m. WITA, along with a VONA Orange issued by VAAC Darwin.

It is recommended that the community around Mount Sirung as well as visitors / climbers / tourists not perform activities within 1.5 km of the summit / crater of Mount Sirung.

The last (phreatic) eruption of Sirung dates from May 8 and 12, 2012.

Sirung caldera summit - Photo by L.D. Reksowirogo, 1972 (Volcanological Survey of Indonesia) / GVP

Sirung caldera summit - Photo by L.D. Reksowirogo, 1972 (Volcanological Survey of Indonesia) / GVP

Sirung volcano is located at the northeast end of a 14 km line of volcanic centers that form a peninsula at the southern end of Pantar Island. The volcano is truncated by a 2 km wide caldera, the soil of which often contains one or more small lakes. Much of the volcano is made up of basaltic lava flows, and the lava dome of Gunung Sirung forms the highest point on the western edge of the caldera.

 

Source: PVMBG & VAAC Darwin, GVP

Nevado de Chillan - ash plume from 07/21/2021 / 8:54 a.m. - Sernageomin webcam

Nevado de Chillan - ash plume from 07/21/2021 / 8:54 a.m. - Sernageomin webcam

On Tuesday July 20, at 4:38 p.m. local time (8:38 p.m. UTC), monitoring stations installed near the Nevados de Chillán volcanic complex recorded an earthquake associated with fluid dynamics (long period type) in the volcanic system. A plume of ash and gas was emitted up to 560 m above the point of emission.

On July 21, a similar earthquake occurred, with the emission of a plume 300 m high. above the crater.

 

Source: Sernageomin

Nevado del Ruiz - Arenas crater - photo archives Jair Ramirez / Ingeominas

Nevado del Ruiz - Arenas crater - photo archives Jair Ramirez / Ingeominas

Nevado del Ruiz activity during the week of July 13 to 19:


Seismicity linked to fluid dynamics, inside volcanic conduits, increased in number of events and in seismic energy released compared to the previous week. This seismic activity was characterized by the appearance of continuous volcanic tremor, tremor pulses, long and very long period earthquakes, which exhibited varying energy levels and spectral content. The earthquakes were located mainly in the Arenas crater. Some of these signals were associated with ash emissions.


Seismicity generated by rock fracturing increased in number of earthquakes and seismic energy released, compared to the previous week. This seismic activity was localized mainly in the south-southwest sectors and the Arenas crater, to a lesser extent in the southwest, northeast and distal north sectors of the volcano. The depths of the earthquakes ranged from 0.4 to 5.5 km. An increase in this type of seismicity emerged on July 14, the earthquakes were located about 3.3 km southwest of the Arenas crater at depths that varied between 2.8 and 4.2 km. The maximum magnitude recorded during the week and, in turn, the largest of the increase was 1.8 ML (local magnitude), corresponding to the earthquake recorded on July 14 at 09:41 (local time), located at 3 , 6 km south-southwest of the Arenas crater at 3.7 km deep.
Regarding drumbeat-type seismicity, there were several low energy episodes associated with rock fracturing on July 13, 14 and 17. This seismicity has been linked to the processes of ascent, location-growth and evolution of a lava dome1 at the bottom of the Arenas crater.

The deformation of the volcanic surface, measured from GNSS (Global Navigation Satellite System) stations and electronic inclinometers continued to show minor changes.
The volcano continues to emit water vapor and gases, mainly sulfur dioxide. The column of gas and vapor reached a maximum height of 1,098 m above the summit of the volcano on July 14. The dispersion of the column was governed by the direction of the wind, towards the west-northwest and west-southwest sectors of the volcano.

During the last week, the MIROVA and NASA FIRMS portals did not report thermal anomalies in the volcano area.
 


The Nevado del Ruiz volcano continues at the yellow activity level.

 

Source: Weekly activity bulletin of the Nevado del Ruiz volcano 13/07 / 19.07.2021 / Servicio Geologico Colombiano

Lake Kivu - location of earthquakes in Rwandan waters - Doc. RSM

Lake Kivu - location of earthquakes in Rwandan waters - Doc. RSM

Shallow, low-magnitude earthquakes continue to be recorded in Lake Kivu, following the Nyiragongo eruption in May 2021.

These earthquakes, respectively M 3.9 and 3.5, were recorded at a depth of about 5 km at 6:26 p.m. and 6:32 p.m. on July 21 (Rwanda Seismic Monitor)

 

Source: Dr. Charles Balagzi / Geochemistry and Environmantal Department, at Goma Volcano Observatory

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Publié le par Bernard Duyck
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 White island - photo GeoNet

White island - photo GeoNet

Recent aerial surveillance from Whakaari / White Island shows high temperatures of 498 to 654 ° C near the lava domes that formed in December 2019 ... an increase from the 110 ° C measured in May-June.

The volcano continues to produce a plume of gas and vapor, which continues to cause acid rain downwind.

The high temperature magmatic gases again reach the surface vents. The mechanism causing these changes is not identified with certainty: either the magma is involved in these subterranean movements towards the surface, or they come from gases released by a stationary body of magma.

Short-lived tremor and volcanic earthquakes have also been recorded.

The volcanic alert level remains at 1, associated with dangerous phenomena (discharge of steam and hot volcanic gases, earthquakes, landslides, and hydrothermal activity). Rashes can occur with little or no warning signs.

 

Source: GeoNet

Taal - steam and gas plume - photo archives CNNPH Philippines Army / Marcello Teofilo

Taal - steam and gas plume - photo archives CNNPH Philippines Army / Marcello Teofilo

In the last 24 hours, the Taal Volcano Network has recorded 10 volcanic earthquakes, including 3 lasting 2-3 minutes, six 6 low frequency earthquakes, and low intensity background tremor persisting since July 7, 2021. .

High levels of volcanic sulfur dioxide emissions and vapor-rich plumes that rose 900 meters before drifting east and northeast were generated by the Taal Main Crater.

Sulfur dioxide emissions average 5,286 tonnes / day on July 20, 2021.

Based on ground deformation parameters from electronic tilt, continuous GPS, and InSAR monitoring, Taal Volcano Island began to deflate in April 2021 as the Taal region continues to undergo expansion. very slow since 2020.


Alert level 3 (magmatic disturbances) now prevails over the Taal volcano. At Alert Level 3, magma exiting the main crater could cause an explosive eruption.

 

Source: Phivolcs

Fagradalsfjall - the active cone and the lava flows on 20.07.2021 / 13:42 - webcam mbls

Fagradalsfjall - the active cone and the lava flows on 20.07.2021 / 13:42 - webcam mbls

Four months and a day have passed since the start of the volcanic eruption on the Reykjanes Peninsula. Scientists have been working for several days to measure the current character of the lava flow, as well as the growth and composition of the lava field.

The eruption has been irregular recently. Geophysicist Þorvaldur Þórðarson says it oscillates between phases of high and low activity and the activity of lava fountains changes about every five to seven minutes, with ten to fifteen minutes between periods of activity.

A drop of ten meters is still to be overcome by the lava before it overflows Meradalur, and resumes its route towards the sea.

We are awaiting the results of an observation and parameterization of the lava field.

 

Source: RUV

Fagradalsfjall - tremor at 21.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 21.07.2021 - Doc. Hraun.vedur.is

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

From around 22:00 UTC on July 19, 2021, the resumption of Strombolian activity at the level of the south-eastern crater of Etna is observed. According to the forecast model, the volcanic ash produced by the current activity is dispersed in the direction of S.
The temporal trend of the mean amplitude of the seismic signal which from the afternoon of day 18 is characterized by large fluctuations, currently shows a fairly stationary trend on medium-high values. The location of the centroid of the volcanic tremor sources is currently located in correspondence with the southeast crater at an altitude of about 2700 m above sea level.

From around 02:20 UTC on July 20, a sudden increase in the amplitude of the volcanic tremor was observed which reached high values. The centroid of the tremor sources is located in correspondence with the southeast crater at an altitude of about 2900 m above sea level.

The INGV reports at 05:47 UTC the gradual transition of Strombolian activity towards a lava fountain at the crater of
South East. Based on the forecast model, the eruptive cloud produced by the current activity disperses towards the SSE. In addition, an overflow of lava is observed from surveillance cameras to the southwest.

The activity is ongoing ... to be continued

 

Source: INGV OE

Etna SEC - 07.20.2021 / 5:12 am - webcam Emot0104 / INGV

Etna SEC - 07.20.2021 / 5:12 am - webcam Emot0104 / INGV

Etna SEC - 07.20.2021 / 07:29 - new webcam LAVE

Etna SEC - 07.20.2021 / 07:29 - new webcam LAVE

 Etna - tremor at 20.07.2021 / 11h  - Doc. INGV OE

Etna - tremor at 20.07.2021 / 11h - Doc. INGV OE

Etna - 20.07.2021 - photo courtesy of © Pippo Scarpinati
Etna - 20.07.2021 - photo courtesy of © Pippo Scarpinati

Etna - 20.07.2021 - photo courtesy of © Pippo Scarpinati

Update :

From around 08:10 UTC the tremor showed a rapid decrease in values ​​which are currently at an average level with a downward trend ...
and the lava fountain of the southeast crater has ceased, weak Strombolian activity continues at the southeast crater with emission of ash.

Etna south-eastern crater - images from January and 20.07.2021 showing the evolution of the SEC - comment by Boris Behncke below - EMOT / INGV OE webcam

Etna south-eastern crater - images from January and 20.07.2021 showing the evolution of the SEC - comment by Boris Behncke below - EMOT / INGV OE webcam

" Six months and three days separate these two images taken by the thermal surveillance camera of Montagnola," EMOT ", on the high southern slope of Etna. Barely freed from its clouds of ash and gas of the last paroxysm (morning of July 20, 2021), the Southeast Crater from this point of view shows a proud cone, almost perfectly symmetrical, and tens of meters higher than at the beginning of this year. Then it seemed crouched, it was wide and flat, a set of volcanic cones pushing side by side and partially on top of each other, the old, the new and the “saddle.” Now the active vents are concentrated exactly in the center of this complex apparatus, and as in the olden days, 20 years ago, the South-East crater shows itself as a full-fledged volcano, pretending to be * it * Etna ". - Comment from Boris Behncke / INGV

Sinabung - eruptive episode of 07.19.2021 / 7:01 p.m. - PVMBG webcam

Sinabung - eruptive episode of 07.19.2021 / 7:01 p.m. - PVMBG webcam

In Sinabung, two eruptive episodes took place on July 19, 2021, respectively at 6:50 p.m. WIB with the height of the ash column observed ± 1000 m above the peak (± 3460 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 86 mm and a duration of 662 seconds.
and at 7:01 p.m. WIB with the height of the ash column observed at ± 300 m above the peak (± 2760 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 47 mm and a duration of 605 seconds.

In addition, the seismicity was characterized by:

- 3 avalanche earthquakes with an amplitude of 15-45 mm and an earthquake duration of 27-74 seconds.
- 8 emission / blast earthquakes with an amplitude of 5 to 59 mm and the duration of the earthquake from 15 to 30 seconds.
- A non-harmonic tremor episode with an amplitude of 3 mm and an earthquake duration of 1422 seconds.
- 1 low frequency earthquake with an amplitude of 22 mm and a duration of 18 seconds.
- 13 hybrid / multiphase earthquakes with an amplitude of 5 to 85 mm, lasting from 7 to 25 seconds.
- 1 local tectonic earthquake with an amplitude of 120 mm, S-P 5.8 seconds and a duration of 60 seconds.

The activity level remains at 3 / siaga.

 

Sources PVMBG, Magma Indonesia

Sinabung - 07.19.2021 from 7:01 p.m. WIB - ithinkx video

 Anak Krakatau, in activity level of level II (Alert) since March 25, 2019, presented, on july 18, a white plume, light to medium, 50 meters high.

Thanks to the seismographic recordings of July 18, 2021, it was recorded - 2 blast / emission earthquakes
- 3 low frequency earthquakes
- 1 distant tectonic earthquake
- continuous tremor, amplitude 1-12 mm (predominance of 2 mm)

The public / tourists are not allowed to approach the crater within 2 km of the crater.

 

Sources: PVMBG & Sentinel-2

Anak Krakatau - clear sky and light plume of gas and steam on 07/18/2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Anak Krakatau - clear sky and light plume of gas and steam on 07/18/2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

In Sabancaya, the week of July 12 to 18, 2021, is characterized, like the previous week of a moderate level of activity, with an average of 100 volcanic explosions per day, accompanied by plumes of ash up to 2,000 meters above Summit.

I.G. Peru provides information for the week 1.124 volcanic earthquakes associated with the circulation of internal magmatic fluids. Volcano-tectonic earthquakes, in connection with the fracturing of rocks occur in an area north of the volcano, from M 1.8 to M 3.1.

No significant deformation anomias; Eleven thermal anomalies, associated with the presence of a surface lava body in the crater, were observed, with a max. of 48 MW.

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

 

Sources: I.G. Peru

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Complejo Volcánico Nevados de Chillán - photo archives Sernageomin

Complejo Volcánico Nevados de Chillán - photo archives Sernageomin

This Sunday, July 18 at 7:17 p.m. local time (11:17 UTC), the monitoring stations installed in the vicinity of the Nevados de Chillán volcanic complex recorded an earthquake associated with fluid dynamics in the volcanic system (Long Period).

The explosive activity continues; a VAAC Buenos Aires advisory mentions a plume of ash and gas at an altitude of 4,300 meters moving north for 10 km.

 

Sources: Sernageomin & VAAC Buenos Aires

Eruption at Fagradalsfjall - the incandescence visible above the clouds on 17.07.2021 / 02h - Icelandair flight via mbls / Gunnhildur

Eruption at Fagradalsfjall - the incandescence visible above the clouds on 17.07.2021 / 02h - Icelandair flight via mbls / Gunnhildur

Fagradalsfjall eruption - Natthaga valley - lava field - photo 07.17.2021 © Jean-Michel Mestdagh

Fagradalsfjall eruption - Natthaga valley - lava field - photo 07.17.2021 © Jean-Michel Mestdagh

Fagradalsfjall eruption - Natthaga valley - lava flow - photo 07.17.2021 © Jean-Michel Mestdagh

Fagradalsfjall eruption - Natthaga valley - lava flow - photo 07.17.2021 © Jean-Michel Mestdagh

The eruption continues in Fagradalsfjall, always more visible around midnight and early in the day.

The tremor is marked by fluctuations. Spattering and  overflows of lava are responsible for the flows that are heading towards Meradalur.

Some pollution from the eruption was detected in the capital region on July 18, due to SO2 and sulfate particles (SO4). It does not come directly from the eruption area, but is caused by an older cloud of gas returning overnight (RUV).

 

Sources: RUV, mbls, and photos from Jean-Michel Mestdagh

Fagradalsfjall - the active crater, seen from trail B in the fog - photo 07/18.2021 © Jean-Michel Mestdagh

Fagradalsfjall - the active crater, seen from trail B in the fog - photo 07/18.2021 © Jean-Michel Mestdagh

Fagradalsfjall - lava flows, views from trail B in the fog - photo 07/18.2021 © Jean-Michel Mestdagh

Fagradalsfjall - lava flows, views from trail B in the fog - photo 07/18.2021 © Jean-Michel Mestdagh

Fafradalsfjall - active vent in Geldingadalur - 07.19.2021 / 01h18 - mbls webcam

Fafradalsfjall - active vent in Geldingadalur - 07.19.2021 / 01h18 - mbls webcam

Fafradalsfjall - active vent in Geldingadalur - 07.19.2021 / 01:32 - mbls webcam

Fafradalsfjall - active vent in Geldingadalur - 07.19.2021 / 01:32 - mbls webcam

Fagradalsfjall eruption - Meradalur - 07/18.2021 / 00h - 24h - video timelapse mbls

Fagradalsfjall - trémor variation at 19.07.2021  - Doc. Hraun.vedur.is

Fagradalsfjall - trémor variation at 19.07.2021 - Doc. Hraun.vedur.is

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Popocatépetl - explosion on 07/16/2021 / 8:45 p.m. - Mexico City webcams

Popocatépetl - explosion on 07/16/2021 / 8:45 p.m. - Mexico City webcams

Popocatépetl - explosion on 07/16.2021 / 8:03 pm - Mexico City webcams

Popocatépetl - explosion on 07/16.2021 / 8:03 pm - Mexico City webcams

On July 16, there were two explosions at Popocatépetl, respectively at 8:01 p.m. and 8:43 p.m. accompanied by the emission of water vapor, gas and ash. The emission reached an average height of 900 m in a westerly direction.


On July 17 from 1:50 a.m., a low amplitude tremor episode started and at 3:50 a.m. the amplitude increased with a continuous emission of water vapor, gas and ash, in addition to incandescent fragments were observed at short distance.
At 3:40 a.m. a high amplitude tremor episode began which continues at this time with a continuous emission of water vapor, gas and ash towards the west.

Cenapred further reports, in the last 24 hours, 74 exhalations of water vapor, gas and light amounts of ash have been identified, as well as a total of 457 minutes of tremor.

A weak thermal anomaly, of VRP 5 MW, was noted by Mirova on July 17 at 8:15 a.m.

Volcanic alert remains at AmarilloFase2

 

Source: Cenapred

Popocatépetl - continuous emission of gas and ashes, ... on 07/17/2021 / 07:08 a.m. - Mexico City webcams

Popocatépetl - continuous emission of gas and ashes, ... on 07/17/2021 / 07:08 a.m. - Mexico City webcams

No eruption is reported at Poas, the activity is limited to passive degassing and thermal convection of the lake,
The fumaroles on the north and east walls of the active crater and the sub-lacustrine fumarole on the southeast side remain active on July 15 and 16.

There is a persistent tremor of very low amplitude and dominant frequency of 5.5 Hz associated with fumarolic activity. A smaller number of volcanic earthquakes is recorded. Magmatic gas emissions remain low, as does seismicity. The Poas maintains a slight extension.

 

Source: Ovsicori

Poas - fumarole on the north inner wall of the crater on 07.15.2021 - Ovsicori webcam

Poas - fumarole on the north inner wall of the crater on 07.15.2021 - Ovsicori webcam

Poas - fumarole on the north inner wall of the crater on 07/16/2021 4:56 p.m. - Ovsicori webcam

Poas - fumarole on the north inner wall of the crater on 07/16/2021 4:56 p.m. - Ovsicori webcam

In the last 24 hours, the Taal Volcano Network recorded 86 volcanic earthquakes, including 84 volcanic tremor events with durations of one to 34 minutes, 1 low frequency volcanic earthquake, 1 hybrid earthquake and the low-level bottom tremor that has persisted since July 7, 2021.

High levels of volcanic sulfur dioxide emissions and vapor-rich plumes that reached heights of 2,100 meters before drifting northeast were generated from the main Taal crater.

Sulfur dioxide (SO2) emissions averaged 5,466 tonnes / day on July 17, 2021. Based on soil deformation parameters from electronic tilt, continuous GPS and InSAR monitoring, the island Taal volcano began to deflate in April 2021 while the Taal region continues to experience very slow expansion. since 2020.

Alert level 3 (magmatic disturbances) now prevails over the Taal volcano. At Alert Level 3, magma exiting the main crater could cause an explosive eruption. The public is reminded that the entire Taal Volcano Island is a Permanent Danger Zone (PDZ) and entry to the island as well as the high risk barangays of Agoncillo and Laurel must be prohibited due to the dangers of pyroclastic and volcanic density currents. tsunami in case of strong eruptions. All activities on Taal Lake should not be permitted at this time.

 

Source: Phivolcs

Taal - summary table of activity on 07/18/2021 - Doc. Phivolcs

Taal - summary table of activity on 07/18/2021 - Doc. Phivolcs

In Iceland, the eruption continues at Fagradalsfjall, under stubborn fog and the consequent lack of aerial observation.

The tremor continues to vary; on webcams, we can observe a lava overflow at 2:17 p.m., which fed lava flows in Meradalur.

 

Sources: RUV webcam and mbls, tremor via Hraun.vedur.is

Fagradalsfjall - activity 07/18.2021 / 02:02 - mbls webcam

Fagradalsfjall - activity 07/18.2021 / 02:02 - mbls webcam

Fagradalsfjall - trémor at 18.07.2021 - Doc.Hraun.vedur.id

Fagradalsfjall - trémor at 18.07.2021 - Doc.Hraun.vedur.id

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