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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

At Fagradalsfjall, the variations of the tremor resumed.
After a half-day break, the eruption in Geldingadalur took a better turn on July 16. The rash increased and resumed properly from ten o'clock this morning. Lava started to flow from the crater again towards Meradalur.

A plane operated by the meteorological office flew over the region several times on 07/16: the eruption increased and the crater filled.
In a conversation with mbl.is, a nature conservation expert at the meteorological office said the lava flow could be assumed to have a flow rate of around ten cubic meters per second.

 

Source: mbls

Fagradalsfjall - 07.17.2021 / 02:41 - active crater and lava flow -  webcam mbls

Fagradalsfjall - 07.17.2021 / 02:41 - active crater and lava flow - webcam mbls

Fagradalsfjall - variations of the tremor at 07.17.2021 - doc. Hraun.vedur.is

Fagradalsfjall - variations of the tremor at 07.17.2021 - doc. Hraun.vedur.is

An explosion occurred at Suwanosejima at 7:58 a.m. on July 17, and the eruptive plume rose 3,400 m above the crater rim.
Volcanic ash disperses northwest of the crater and a large amount of ash fell on the village of Toshima
In addition, in the area from the crater about 4 km to the north, small volcanic bombs are blown away.

 

Source: JMA

Suwanosejima - eruptive plume from 07.17.2021 around 8am - JMA webcam

Suwanosejima - eruptive plume from 07.17.2021 around 8am - JMA webcam

The seismic activity at La Soufrière, St Vincent has remained weak since the tremor associated with the explosion and the ash evacuation of April 22. In the past 24 hours, only a few small earthquakes have been recorded.
Persistent vapor emissions from a few regions within the crater continue to be the dominant observable feature.
Thermal anomalies continue to be detected but do not indicate that an explosive event is imminent but that there is a heat source, most likely from a small body of magma remaining, near the bottom of the summit crater.
Sulfur dioxide flow measurements at La Soufrière were taken by boat off the west coast on July 13, with the help of the coast guard. Several crossings were made and gave an average SO2 flow of 306 tonnes per day.

The volcano is at the ORANGE alert level.

 

Sources: UWI-SRC & NEMO

Soufrière de St. Vincent - The top of the volcano and the top of the Larakai valley filled with deposits. - photo Javid Collins, UWI-TV.

Soufrière de St. Vincent - The top of the volcano and the top of the Larakai valley filled with deposits. - photo Javid Collins, UWI-TV.

Between July 9 and 16, the Volcanological and Seismological Observatory of Martinique recorded at least 76 volcano-tectonic earthquakes of magnitude less than or equal to 0.2. There were 41 earthquakes between July 2 and 9.

This week's 76 earthquakes were located inside the volcanic edifice between sea level and 1 km above sea level. None of these earthquakes were felt by the population.

A main area of ​​heavily degraded vegetation is still observed on the southwest flank of Mount Pelée, between the upper Claire River and the Chaude River.

These observations reflect the variable dynamics of the processes of magmatic and hydrothermal origin at Mount Pelée in line with its renewed activity since April 2019.

The alert level remains on Yellow alert.

 

Source: OVSM

Summit of Mount Pelée / Martinique - photo jmp48

Summit of Mount Pelée / Martinique - photo jmp48

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Ili Lewotolok - Strombolian activity of 07.15.2021 / 7.45 p.m. WITA - Magma Indonesia webcam

 Ili Lewotolok - Strombolian activity of 07.15.2021 / 7.45 p.m. WITA - Magma Indonesia webcam

At Ili Lewotolok, in level 3 / siaga activity since November 29, 2020, plumes of color varying between white and gray are observed at heights up to 800 meters above the summit on July 15.

At the seismicity level, the PVMBG reports:

- 18 eruption earthquakes

- 32 blast / emission earthquakes

- 5 episodes of harmonic tremor

- 50 episodes of non-harmonic tremor

- 1 deep volcanic earthquake.

 

Communities around Mount Ili Lewotolok as well as visitors / climbers / tourists are recommended not to engage in activities within 3 km of the summit / crater.

 

Sources: PVMBG, Magma Indonesia

Ili Lewotolok - seismicity - there are three stages / phases between April and July 2021 - Doc. Magma Indonesia - one click to enlarge

Ili Lewotolok - seismicity - there are three stages / phases between April and July 2021 - Doc. Magma Indonesia - one click to enlarge

A moderate eruptive activity continues at Karymsky.

Satellite data shows ash plumes extending up to 80 km from the volcano on July 8, 11 and July 15.

A thermal anomaly is observed on July 8 and 10-13.

The KVERT reports for this July 15 an ash plume at 2,000 meters asl. Moving over 42 km towards the SEE.

The aviation code remains orange; other ash explosions can occur at any time and affect air traffic.

 

Sources: KVERT é VAAC Tokyo

Karymsky - Photo archives in the absence of visibility / Belousov via Volkstat 10.2020

Karymsky - Photo archives in the absence of visibility / Belousov via Volkstat 10.2020

Karymsky - Volcanic ash advisory 15.07.2021 / 0600Z / Vaac Tokyo

Karymsky - Volcanic ash advisory 15.07.2021 / 0600Z / Vaac Tokyo

In Fagradalsfjall, lava flows in tunnels.

July 15, only visible difference: modifications of the tremor after 4 days of intense variations.

Due to bad weather, the observatory has still not been able to make new satisfactory aerial observations and measurements.

Skylight in the middle of a large lava field near the Fargadalsfjall volcano. Captured with the Mavic 2 Pro drone by Sigurður þór Helgason

Fagradalsfjall - variations of the tremor at 16.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - variations of the tremor at 16.07.2021 - Doc. Hraun.vedur.is

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Suwanosejima - 07/14/2021, at 1:51 p.m. and 2:13 p.m. respectively - JMA webcam
 Suwanosejima - 07/14/2021, at 1:51 p.m. and 2:13 p.m. respectively - JMA webcam

 Suwanosejima - 07/14/2021, at 1:51 p.m. and 2:13 p.m. respectively - JMA webcam

The eruption continues on Suwanosejima.

The JMA noted on July 12 a plume of gas and ash at 3,000 meters above the active crater, and on July 14 at 2:18 p.m., a plume at 2,800 meters above the crater.

The ashes are scattered northwest of the crater, with falls over the village of Toshima.

Bombs can fall in an area of ​​2 km radius to the north.

 

Source: JMA

Semisopochnoi - photo archive AVO / Dietterich, Hannah 30.05.2021

Semisopochnoi - photo archive AVO / Dietterich, Hannah 30.05.2021

Semisopochnoi - RSAM of 13.07.2021 - Doc.AVO

Semisopochnoi - RSAM of 13.07.2021 - Doc.AVO

The aviation color code was increased to Orange and the volcanic alert level to Watch on July 12 at Semisopochnoi, due to the occurrence of a continuous volcanic earthquake and detections of explosive activity on sensors Newly installed local infrasound.

Satellite observations on the afternoon of July 13 showed emissions from a cloud of volcanic gas (SO2), possibly containing volcanic ash. The emissions occurred for tens of minutes beginning at around 2100 UTC (1300 AKDT) and produced a low-level cloud that moved south to an altitude of less than 1,500 meters asl.

The volcanic tremor continued for several hours yesterday afternoon before dropping to low levels. No additional gas / ash emissions were observed in satellite data or detected on the local infrasound network.

 

Source: AVO

Kilauea - Halema'uma'u - laser rangefinder measurements to study the surface of the solidified lava lake at Halema'uma'u, at the top of Kīlauea. - Mr. Patrick USGS 09.07.2021

Kilauea - Halema'uma'u - laser rangefinder measurements to study the surface of the solidified lava lake at Halema'uma'u, at the top of Kīlauea. - Mr. Patrick USGS 09.07.2021

The Kīlauea volcano is not currently erupting.

No surface activity has been observed by field crews or on webcam images since May 23, 2021. Seismicity has slowly increased in recent weeks in the summit region, with continued summit inflation in recent months .
Summit tiltmeters have recorded two cycles of deflation-inflation over the past week, along with continued gradual inflation. Continuing inflation was also recorded by the summit's GPS instruments; however, the tilt and GPS movement pattern indicates that the center of inflation may have shifted slightly towards the southern part of the caldera.

Seismicity has slowly increased in recent weeks, although it has yet to reach the levels seen immediately before the December 2020 eruption.
Sulfur dioxide emission rates remain slightly high.


Current volcanic alert level: Advisory
Current Aviation Color Code: Yellow

 

Source: HVO 13.07.2021

Geldingadalur crater - photo 07.12.2021 / Volcanology and Natural Hazard Group, University of Iceland. in Iceland Review

Geldingadalur crater - photo 07.12.2021 / Volcanology and Natural Hazard Group, University of Iceland. in Iceland Review

Fagradalsfjall - crater on 13.07.2021 - from langihryggur webcam

Fagradalsfjall - crater on 13.07.2021 - from langihryggur webcam

Fagradalsfjall - 14.07.2021 / 00h00 - webcam_langihryggur NV

Fagradalsfjall - 14.07.2021 / 00h00 - webcam_langihryggur NV

At Fagradalsfjall, it seems that morphological changes have taken place at the active crater in Geldingadalur and that a new channel has formed for the lava towards Meradalur ... all this in the absence of news through the usual channels, presumably due to bad weather conditions.

The variations of the tremor remain important.

 

Sources: webcams

Fagradalsfjall - tremor at 14.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 14.07.2021 - Doc. Hraun.vedur.is

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Semisopochnoi - Cerberus cone degassing  - AVO archive photo 06.08.2021 by Cyrus Read

 Semisopochnoi - Cerberus cone degassing  - AVO archive photo 06.08.2021 by Cyrus Read

Aviation color code and alert level for Semisopochnoi, in Aleutian Arc, changed to Orange / Watch due to seismic tremor and low level ash emissions on 12.07. 2021.

A continuous volcanic tremor began to be observed at ~ 8:00 p.m. UTC (12:00 a.m. AKDT) and is continuing. Ash emissions were visible in satellite data starting around 9:00 p.m. UTC (1:00 p.m. AKDT) down to an altitude below 5,000 feet asl (depending on wind direction). Satellite observations yesterday afternoon showed a robust steam plume and sulfur dioxide emissions.

 

Source: AVO

Sinabung - photo Beidar Sinabund / Sadrah Peranginangin 07/13.2021 / 09:25 WIB

Sinabung - photo Beidar Sinabund / Sadrah Peranginangin 07/13.2021 / 09:25 WIB

In Sinabung, on the island of Sumatra, on Tuesday July 13, 2021 at 09:34 WIB, an eruptive episode is observed, accompanied by an ash plume observed at ± 300 m above the summit (± 2760 m above the sea ​​level). The ash column is gray, thick, leaning to the east and south-east.

This eruption was recorded on a seismograph with a maximum amplitude of 14 mm and a duration of 1069 seconds.

 

Sources: PVMBG, Magma Indonesia, Beidar Sinabung

Ili Lewotolok - 13.07.2021 / 10:08 WITA - webcam PVMBG / Magma Indonesia

Ili Lewotolok - 13.07.2021 / 10:08 WITA - webcam PVMBG / Magma Indonesia

Mount Ili Lewotolok experienced an eruptive episode on Tuesday, July 13, 2021 at 10:06 a.m. WITA, which produced an ash plume observed ± 800 m above the summit (± 2223 m above sea level).

 

Sources: PVMBG, Magma Indonesia.

Reventador - gas and ash emission on 12.07.2021 / 23:41 UTC - IGEPN webcam

Reventador - gas and ash emission on 12.07.2021 / 23:41 UTC - IGEPN webcam

Gas and ash emissions were observed yesterday afternoon in Reventador, Ecuador, 500 to 1,000 meters above crater level in a northwest direction.

VAAC Washington reported 2 alerts of satellite-observed transmissions, which reached heights of 700 meters above crater level in a west-northwest direction.

FIRMS has reported 1 thermal alert to the Reventador in the last 24 hours.

At night, an incandescence was observed in the crater and the rolling of incandescent materials along the southeast flank of the volcano up to 300 meters below the level of the crater. The rest of the time, the volcano remained cloudy.

The alert level is Naranja

 

Source: IGEPN

Fagradalsfjall - gas plume and ash on 07.13.2021 / 03:48 a.m. - webcam_slaga NNA

Fagradalsfjall - gas plume and ash on 07.13.2021 / 03:48 a.m. - webcam_slaga NNA

The eruption continues at the same pace as yesterday in Fagradalsfjall, with better visibility, at least this early morning.

From the images of the webcams, we will retain for this July 13, a dark plume at 3:48 a.m., and various incandescent events, including one at 4:10 a.m.

The tremor remains in the standards of the day before.

 

Sources: webcams and tremor diagram via Hraun.vedur.is

Fagradalsfjall - incandescence at the crater active on 13.07.2021 / 04:10 a.m. - webcam_langihryggur NV

Fagradalsfjall - incandescence at the crater active on 13.07.2021 / 04:10 a.m. - webcam_langihryggur NV

 Fagradalsfjall - trémor 0n 07.13.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - trémor 0n 07.13.2021 - Doc. Hraun.vedur.is

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

In Fagradalsfjall, the eruption is still going well, despite the eruptive break that lasted for several days last week.

Changes can be noted at vent # 5: an internal rear part of the cinder cone collapsed on July 10, and very fluid lava is flowing towards Meraldalur from its foot.

The variations of the tremor remain large, but a slightly longer distance is observed between the agitation pulses, although the activity of the pulses remains persistent.

On July 11, the weather did not allow good observations, between low clouds and dense fog.

 

Sources: RUV, mbls, IMO

Fagradalsfjall - tremor at 11.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor at 11.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall eruption - Activity of 07/10/2021 - Green Island video - https://www.youtube.com/watch?v=BwxRnG7VXx4

Fagradalsfjall eruption - part of back wall collapses - video Viðburðastofa Vestfjarða - https://www.youtube.com/watch?v=ExeSDpviRzg

Another warm-up phase has started at Mount Ruapehu, New Zealand.

In the past three months, the temperature of the crater lake (Te Wai ā-moe) has dropped from 41 ° C (April 12, 2021) to 20 ° C (July 2, 2021). The turnaround in the lake's temperature in early July followed two small volcanic earthquakes and was accompanied by a higher level of volcanic tremor over the weekend, as is often the case at the start of a warming episode.

Ruapehu - Te Wai ā-moe crater lake - photo archives Brad Scott

Ruapehu - Te Wai ā-moe crater lake - photo archives Brad Scott

Typically, over periods of several months, Ruapehu Crater Lake (Te Wai ā-moe) undergoes cycles of heating and cooling. At the end of December 2020, the lake warmed to around 43 ° C marking the peak of the previous cycle. At the start of 2021, the lake cooled until February 2021, before heating up again in early March. A maximum of 41 ° C was reached on April 12, 2021. The lake then began to cool to 20 ° C on July 2. The temperature of the lake started to rise again last week and is currently 23 ° C.

As the lake cooled (April-July), the modeled heat input to the lake was approximately 80 to 100 MW (megawatt). To heat the lake water temperature by 3 ° C, our modeling indicates that around 300-600 MW (megawatt) of heat is now entering the lake.

Two small earthquakes were located and a higher level of volcanic tremor accompanied the onset of the lake's temperature rise. The appearance of tremors is quite typical of the onset of such a heating phase.

The Volcanic Alert Level remains at Level 1, reflecting the current level of volcanic unrest. Mount Ruapehu is an active volcano and has the potential to erupt with little to no warning when in a state of volcanic unrest. The aviation color code remains green.

 

Source: GeoNet 07.12.2021 / A.Mazot

Taal - activity summary at 07.12.2021 / 08h - Mdrrmc Talisay Batangas

Taal - activity summary at 07.12.2021 / 08h - Mdrrmc Talisay Batangas

In the past 24 hours, the Taal volcano network has recorded 185 volcanic earthquakes, including seven of low frequency, 176 volcanic tremor episodes lasting between 1 to 16 minutes, and a low level bottom tremor that has persisted since July 7. 2021.

High levels of sulfur dioxide emissions and vapor-rich plumes that rose to 1,500 meters before drifting southwest and west-northwest were generated from the main crater of Taal. Sulfur dioxide (SO2) emissions were on average 6,421 tonnes / day on July 11, 2021.

Based on ground deformation parameters from electronic tilt, continuous monitoring by GPS and InSAR, 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 agitation) 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

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Fagradalsfjall vent 5 - 07.10.2021 / 10:17 pm - Visir webcam

 Fagradalsfjall vent 5 - 07.10.2021 / 10:17 pm - Visir webcam

Status of current activity in Fagradalsfjall :
On the night of July 10 to 11, the eruptive activity gradually increased again. The episodic trend has resumed, with pulsating lava fountains lasting 6 to 8 minutes and intervals between each episode of around 5 to 6 minutes at the moment. (Volcano Chaser).

This activity continues this July 11 in the early hours, according to the images of webcams.

 

Sources: RUV, mbls, Almannavarnir, Volcano Chaser

Fagradalsfjall - tremor at 11.07.2021 - Doc. Hraun.vedur

Fagradalsfjall - tremor at 11.07.2021 - Doc. Hraun.vedur

Fagradalsfjall - 07.11.2021 / 03:45 - view from Natthaga valley  / webcam_slaga NNA

Fagradalsfjall - 07.11.2021 / 03:45 - view from Natthaga valley / webcam_slaga NNA

Fagradalsfjall - 07.11.2021 / 04:20 - webcam_langihryggur NV

Fagradalsfjall - 07.11.2021 / 04:20 - webcam_langihryggur NV

Fagradalsfjall - vent # 5 07.11.2021 / 06:30 - RUV webcam

Fagradalsfjall - vent # 5 07.11.2021 / 06:30 - RUV webcam

The monitoring stations installed near the CV Nevados de Chillán recorded this Saturday, July 10, at 8:33 am and 9:05 am, 2 earthquakes associated with fluid dynamics within the volcanic system (Long Period).

Stay in alert  Amarilla level

 

Source: Sernageomin

Nevados de Chillán - 2021.07.10 / 12:33 UTC- webcam Portezuelo / Sernageomin

Nevados de Chillán - 2021.07.10 / 12:33 UTC- webcam Portezuelo / Sernageomin

Over the past 24 hours, the Taal volcano network has recorded:

- 74 volcanic earthquakes, including thirteen (13) low frequency volcanic earthquakes,

- and 61 volcanic tremor events with durations of 1 to 25 minutes

- and a low-level background tremor that has persisted since July 7, 2021.

A phreatomagmatic episode occurred at the main crater of Taal at 11:56 a.m. on July 10, which generated a dark gray plume of 200 meters, captured by the main crater's IP camera.

High levels of volcanic sulfur dioxide emissions and vapor-rich plumes that rose one thousand (1000) meters before drifting west-northwest and southwest were generated from the crater principal of Taal. Sulfur dioxide emissions averaged 6,488 tonnes / day on July 10, 2021.

Based on ground deformation parameters from electronic tilt, continuous monitoring by GPS and InSAR, 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 unrest now prevails over Taal volcano.

 

Sources: Phivolcs

Taal - activity summary as of 11.07.2021 - level 3 alert - Doc. Phivolcs

Taal - activity summary as of 11.07.2021 - level 3 alert - Doc. Phivolcs

The explosive eruption of Suwanosejima volcano in the Ryukyu Archipelago continues and has remained essentially unchanged at nearly constant levels.
Surveillance cameras from the Japan Meteorological Agency (JMA) observed a volcanic-type explosion at 11:44 a.m. local time today, July 11. An ash plume rose to an altitude of 6,900 feet (2,100 m).

Volcanic ash has scattered northeast of the crater, and within an hour a fairly large amount of ash is reported in Toshima village, as is ashfall in Kagoshima Prefecture.
An almost constant glow in the Ontake crater suggests that the flow of magma is increasing inside the building.

The explosions continue to generate pyroclastic bombs and boulders which are ejected up to 800 meters from the crater towards the northwest.


The warning bulletin indicates that the ballistic impacts of the volcanic bombs could affect an area approximately 2 km away from the main crater.

 


Source: JMA July 11, 2021 / 11:53 a.m.

Suwanosejima - 2021.07.11 / 11:48 loc - webcam JMA

Suwanosejima - 2021.07.11 / 11:48 loc - webcam JMA

A little activity seems to resume in Nishinoshima in this month of July, during which Mirova recorded weak to moderate thermal anomalies, of VRP between 2 and 41 MW (more precisely of VRP 41 MW on July 10, and 11 to 25 MW July 11).

 

Nishinoshima is on alert 3 / near crater warning.

 

Sources: JMA & Mirova

Nishinoshima - moderate thermal anomalies at 07.11.2021 / 03:20 - Doc. Mirova

Nishinoshima - moderate thermal anomalies at 07.11.2021 / 03:20 - Doc. Mirova

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The AVO / Alaska Volcano Observatory - USGS website announces this July 9 five volcanoes in aviation code Yellow / level of advisory alert: the Great Sitkin, the Gareloi, the Cleveland, the Semisopochnoi and the Pavlof.

The status of the Veniaminof volcano changed from unassigned to green / normal this week.

The summit of Pavlof, with Pavlof Sister in the background - photo AVO archives / Davif Fee

The summit of Pavlof, with Pavlof Sister in the background - photo AVO archives / Davif Fee

The status of the Pavlof volcano changed from green to yellow / Advisory alert level on July 9 at 11:40 a.m. The seismic activity has increased during the last day and is characterized by an almost continuous tremor. The tremor has also been observed in infrasound and regional seismic data.

No eruptive activity or emission from the summit was observed in cloudy views from satellites and web cameras. The increase in seismicity doesn't mean an eruption is imminent, but the Pavlof's past eruptions have occurred with little to no warning.

Pavlof Volcano is a snow and ice covered stratovolcano located at the southwestern end of the Alaska Peninsula about 953 km (592 mi) southwest of Anchorage. The volcano is approximately 7 km (4.4 mi) in diameter and has active vents on the north sides and is near the summit. With more than 40 historical eruptions, it is one of the most active volcanoes in the Aleutian arc. Eruptive activity is typically characterized by sporadic Strombolian lava fountains that continue for several months. Ash plumes up to 49,000 feet ASL were generated by past eruptions of the Pavlof, and during the eruption of March 2016, ash plumes up to 40,000 feet above sea level were generated and the ash has been tracked in satellite data as far away as eastern Canada. The nearest community, King Cove, is located 48 km (30 miles) southwest of Pavlof.

 

Source: AVO-USGS

Fagradalsfjall - spattering at cone # 5 on 07.10.2021, at 3:36 a.m. - VISIR webcam - one click to enlarge

Fagradalsfjall - spattering at cone # 5 on 07.10.2021, at 3:36 a.m. - VISIR webcam - one click to enlarge

Fagradalsfjall - spattering at cone # 5 on 07.10.2021, at  4:11 a.m.  - VISIR webcam - one click to enlarge

Fagradalsfjall - spattering at cone # 5 on 07.10.2021, at 4:11 a.m. - VISIR webcam - one click to enlarge

Fagradalsfjall - tremor on 10.07.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - tremor on 10.07.2021 - Doc. Hraun.vedur.is

At Fagradalsfjall, despite the foggy atmospheric conditions unfavorable to direct observation, we can observe a resumption of activity at the level of vent # 5 around the middle of the night.

An incandescence is first noticed, followed by spattering. The effusion of lava produces a lava flow, which spreads out in Meradalur.

 

Sources: Visir and almanavir webcams; Hraun, vedur, is

Fagradalsfjall - lava flow in Merardalur on 07.10.2021 / 10:05 am - Almanavir webcam

Fagradalsfjall - lava flow in Merardalur on 07.10.2021 / 10:05 am - Almanavir webcam

The eruption, which began in October 2015 (GVP), is still ongoing in Langila, on New Britain / Papouasie Nouvelle-Guinée.

On the image Sentinel-2 bands 12,11,4 of June 30, and July 7 - 10, 2021, we can observe a hot spot at the active crater and a plume of gas and ash marking an explosion, drifting towards the WNW.

 

Source: Sentinel-2

Langila / PNG - image Sentinel-2 L1C bands 12,11,4 from 07.10.2021

Langila / PNG - image Sentinel-2 L1C bands 12,11,4 from 07.10.2021

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 Etna SEC - a new climax on 07.08.2021 - photo Gio Giusa

 Etna SEC - a new climax on 07.08.2021 - photo Gio Giusa

From around 19:00 UTC on July 8, the resumption of Strombolian activity is observed at the level of the south-eastern crater of Etna; this is sharply increasing from 19:55 UTC. Based on the forecast model, the ash produced by the current activity is dispersed in the direction of S.

Around 8:45 p.m. UTC, we observe the gradual passage of Strombolian activity at the lava fountain stage at the Southeast crater. In addition, there is an overflow of lava in the SW direction. According to the forecast model, the eruptive cloud produced by the current activity disperses in the S direction, reaching a height of about 4000 m above sea level.


The INGV reports at 22:47 that the lava fountain of the Southeast crater is complete, while a weak emission of ash continues.

The explosive activity produced an eruptive cloud which reached about 11,000 m altitude, based on satellite images, moving first in the S direction then in the SE direction, and a small lava flow from the southern flank of the south-eastern crater cone. The flow, which has moved towards the SW, is currently still fed and is located at an altitude of about 2800 m above sea level. News has been received of fallout of volcanic material on the villages of Zafferana Etnea (E side), Fleri (SE side), Pedara and Cannizzaro (S side).

 

Source: INGV OE

Etna SEC- 08.07.2021 / 20h57 - webcam EMOT & EMOV INGV - one click to enlargeEtna SEC- 08.07.2021 / 20h57 - webcam EMOT & EMOV INGV - one click to enlarge

Etna SEC- 08.07.2021 / 20h57 - webcam EMOT & EMOV INGV - one click to enlarge

Etna- trémor at 09.07.2021 / 06h - INGV OE

Etna- trémor at 09.07.2021 / 06h - INGV OE

Etna - Thermal anomalies at 07.08.2021 / 9.50 a.m. - Sentinel-2 bands 12,11,8A and MODIS thermal volcanic activity images - Doc. Mirova

Etna - Thermal anomalies at 07.08.2021 / 9.50 a.m. - Sentinel-2 bands 12,11,8A and MODIS thermal volcanic activity images - Doc. Mirova

A moderate activity is observed at the Karymsky on July 7 and 8, 2021; it is accompanied by plumes of ash at 2,500 m. asl. extending 60 km west of the volcano.

KVERT issued an orange VONA on July 8, with ash explosions that can affect civil aviation and low-level flights at any time.

 

Source: KVERT / KSCNET

Karymsky - photo archives Volkstat 2020

Karymsky - photo archives Volkstat 2020

In Nyiragongo, the air quality monitoring carried out by the OVG during the eruption made it possible to limit the loss of human life due to toxic gases. However, some loss of human life was noted.

 

Source: Dr. Charles Balagizi / 08,07,2021

Nyiragongo - thermal anomalies at 07/06/2021 / 8:30 am - Sentinel-2 bands 12,11,8A and MODIS thermal volcanic activity images - Doc. Mirova

Nyiragongo - thermal anomalies at 07/06/2021 / 8:30 am - Sentinel-2 bands 12,11,8A and MODIS thermal volcanic activity images - Doc. Mirova

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Taal - phreatomagmatic episode of 07.07.2021 / 05h18

Taal - phreatomagmatic episode of 07.07.2021 / 05h18

Taal - 07.07.2021 - small phreatomagmatic plume - extract from video Phivolcs

Taal - 07.07.2021 - small phreatomagmatic plume - extract from video Phivolcs

At 5:18 a.m. on July 7, a short-lived phreatomagmatic eruption occurred at the main Taal crater and generated a grayish plume that rose 300 meters before drifting southeast. Five other short phreatomagmatic bursts occurred at 8:47 am, 9:15 am, 9:26 am, 11:56 am and 9:41 pm yesterday and caused short plumes that rose up to 700 meters above the main crater lake.

In the past 24 hours, the Taal Volcano network recorded 61 volcanic earthquakes, including

5 explosion-type earthquakes, 24 low-frequency volcanic earthquakes, 21 volcanic earthquakes. episodes of two 2 to four 4 minutes, 10 hybrid earthquakes and a low level background tremor which ended yesterday at 6:21 pm but resumed at 9:52 pm.

High levels of volcanic sulfur dioxide or SO2 gas emissions and vapor-rich plumes that rose to 1,500 meters before drifting southwest were generated from the main crater of Taal. Sulfur dioxide emissions averaged 11,397 tonnes / day on July 7, 2021. Based on soil deformation parameters from electronic tilt, GPS continuous monitoring and InSAR, Taal Volcano Island began to deflate in April 2021 while the Taal region continues to experience a 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 volcano island - DJI AIR2s drone flight over the crater lake - World Of Fun and Travel video 07.06.2021

Sernageomin and Segemar reported increased activity at Copahue, starting with minor and sporadic increases in tremors first detected in late May.

From June 30 to July 2, the tremors increased and the volume of water in the crater lake decreased significantly. Coincidentally, the crater's glow was visible in nighttime webcam views, and gas emissions increased. Residents reported smells of volcanic gas.

The increase in gas and vapor emissions between 11:00 a.m. and 2:00 p.m. on July 2 contained minor amounts of ash which left visible deposits on the SE and ENE flanks.

The alert level remained at green (the lowest level on a four-color scale).

 

Sources: Sernageomin & Global Volcanism Program

Copahue - ash deposits and small plume on 03.07.2021 - photo Valentina Sepulveda from Caviahue - one click to enlarge

Copahue - ash deposits and small plume on 03.07.2021 - photo Valentina Sepulveda from Caviahue - one click to enlarge

In Fagradalsfjall, the breaks are getting longer and the activity time is shorter, with a preference for night hours.

New flow measurements are awaited to confirm or deny the constancy of the magma supply.

 

Sources: Webcams & measurements of the tremor / Hraun

Fagradalsfjall - glowing active vent on 07.08.2021 / 00:37 - Visir 2 webcam

Fagradalsfjall - glowing active vent on 07.08.2021 / 00:37 - Visir 2 webcam

Fagradalsfjall - 08.07.2021 / 00:40 - webcam langihryggur NV

Fagradalsfjall - 08.07.2021 / 00:40 - webcam langihryggur NV

Fagradalsfjall - variations of the tremor on 08.07.2021 - Doc. Hraun.is

Fagradalsfjall - variations of the tremor on 08.07.2021 - Doc. Hraun.is

Dr Adam Stinton returned to St Vincent to undertake a preliminary photogrammetric study of the La Soufrière summit in June 2021.
 

This aerial photographic mapping (performed using a Sony a6000 24.2MP camera with a 20mm lens - software: AgiSoft Metashape) confirmed that no new lava dome formed as a result of the explosions that ended on the 22 April 2021, and the average characteristics inside the new crater (including the crater itself) are all the result of the explosive phase of the eruption between April 9 and 22, 2021.

Mapping has identified several prominent fumaroles that are the source of the vapor and gas plumes visible above the rim of the summit crater on a clear day.
The presence of fumaroles also confirms the detection of thermal anomalies inside the new crater by the satellites.

 

Source: UWI-SRC

Soufriere of st. Vincent - aerial photographic mapping of June 2021 - Doc. UWI-SRC / Dr. Stinton - one click to enlarge
Soufriere of st. Vincent - aerial photographic mapping of June 2021 - Doc. UWI-SRC / Dr. Stinton - one click to enlarge
Soufriere of st. Vincent - aerial photographic mapping of June 2021 - Doc. UWI-SRC / Dr. Stinton - one click to enlarge

Soufriere of st. Vincent - aerial photographic mapping of June 2021 - Doc. UWI-SRC / Dr. Stinton - one click to enlarge

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

On July 6, 2021 around 9:30 p.m. UTC, the resumption of Strombolian activity at the level of the south-eastern crater of Etna is observed. According to the forecast model, the ash produced by the current activity is dispersed in the SE direction. This activity intensifies from 10 p.m. UTC.
From 22:30 UTC, the gradual transition from Strombolian activity to the form of a lava fountain is observed at the SE crater. According to the forecast model, the eruptive cloud produced by the current activity disperses in the S direction, reaching a height of about 5000 m above sea level.

Observations made by INGV staff present in the field show an abundant fallout of coarse material that covers the sides of the cone of the south-eastern crater up to the area of ​​the ancient Torre del Filosofo. A relapse of lapilli is reported in Tremestieri and Nicolosi, on the southern slope.

Etna - trémor at 07.07.2021 / 07h- Doc. INGV OE

Etna - trémor at 07.07.2021 / 07h- Doc. INGV OE

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

The lava fountain of the southeast crater ceased its activity a little after midnight, while a weak Strombolian activity with ash emission continues on July 7. The eruptive activity produced a small lava flow from the southern flank of the cone of the southeast crater. The flow, which was heading towards the SW, is currently fed and is located at an altitude of about 2800 m above sea level.

 

In its weekly report, the INGV displays a map of the flows between June 28 and July 4.

The full article can be read by following this link: https://buff.ly/3jNUuRF
 

 

Source: INGV OE

Map of the Etna flows from June 28 to July 1 and 4 on a shaded model of the terrain. BN: Bocca Nuova, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The base the topographic reference on which the morphological updates have been superimposed is DEM 2014 developed by the Aerogeophysical Laboratory-Section Rome 2 / via INGV OE - one click to enlarge

Map of the Etna flows from June 28 to July 1 and 4 on a shaded model of the terrain. BN: Bocca Nuova, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The base the topographic reference on which the morphological updates have been superimposed is DEM 2014 developed by the Aerogeophysical Laboratory-Section Rome 2 / via INGV OE - one click to enlarge

According to IGPeru, the eruptive activity of Sabancaya remained at moderate levels during the week of June 28 to July 4, 2021. An average of 91 daily explosions were observed, accompanied by plumes of gas and ash reaching up to 3,000 meters above the summit.

During this week, 1,103 volcanic earthquakes associated with the circulation of internal fluids were analyzed; VT earthquakes, related to the fracturing of rocks, occurred mainly to the northwest and northeast of the volcano, of magnitude between 1.9 and 3.6.

No significant variations in deformation.

Eleven thermal anomalies were identified by satellite, with a maximum of VRP 56 MW. Two hot spots were visible on the Sentinel-2 images.

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

 

Sources: I.G. Peru, Mirova and Sentinel-2

Sabancaya - thermal anomalies, with 2 hot spots in the crater - image Sentinel-2 bands 12,11,8A of 06.28.2021 / 2:57 p.m. - one click to enlarge

Sabancaya - thermal anomalies, with 2 hot spots in the crater - image Sentinel-2 bands 12,11,8A of 06.28.2021 / 2:57 p.m. - one click to enlarge

Sabancaya - activity between 28.06.2021 and 04.07.2021 - Doc. I.G. Peru

Sabancaya - activity between 28.06.2021 and 04.07.2021 - Doc. I.G. Peru

In recent days, the rhythm of the eruption at Fagradalsfjall has changed somewhat. The rash subsided but resumed, with so-called rash pauses.
Ármann Höskuldsson, a volcanologist, was at the eruption site says lava was still flowing under the crust. The eruption would not have stopped: the eruption was never very powerful, and given the height taken by the crater, it is easier for it to flow directly into the lava field rather than to s' rise to get out of the crater.

Fumaroles are still emerging from the lava field, and "red" is still visible: the lava is flowing under the surface.

 

Source: interview in RUV

Fagradalsfjall - tremor at 07.07.2021 - Doc. Hraun.is

Fagradalsfjall - tremor at 07.07.2021 - Doc. Hraun.is

Fagradalsfjall - fumaroles on the lava field at 07.07.2021 / 02:50 - webcam_slaga NNA / Veðurstofa Íslands

Fagradalsfjall - fumaroles on the lava field at 07.07.2021 / 02:50 - webcam_slaga NNA / Veðurstofa Íslands

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