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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

From 17:39 UTC on June 25, the resumption of Strombolian activity at the south-eastern crater of Etna is observed from surveillance cameras, increasing around 18:05 UTC, and emerging, according to a pattern now known, around 18:25 UTCon an overflow of lava, which from the southern slope of the southeast crater, spreads in a southwest direction.

Etna SEC - 06.25.2021 / 6:25 p.m. - EMOT / INGV webcam

Etna SEC - 06.25.2021 / 6:25 p.m. - EMOT / INGV webcam

From around 6:40 p.m. UTC, the transition of Strombolian activity from the Southeast Crater to a lava fountain can be observed from surveillance cameras. The height of the eruptive column reached about 7.6 km above sea level, dispersing to the east. As of 7:15 p.m. UTC, the lava fountain in the southeast crater has gradually depleted.

Etna SEC - ash plume and lava fountain of 25.06.2021 / times indicated - new webcam LAVE
Etna SEC - ash plume and lava fountain of 25.06.2021 / times indicated - new webcam LAVE

Etna SEC - ash plume and lava fountain of 25.06.2021 / times indicated - new webcam LAVE

Etna's "incandescent expiration" - the southeast crater erupted on 06.25.2021 - photo Gio Giusa

Etna's "incandescent expiration" - the southeast crater erupted on 06.25.2021 - photo Gio Giusa

Etna - variations of the tremor at 06.26.2021 / 06h - Doc. INGV

Etna - variations of the tremor at 06.26.2021 / 06h - Doc. INGV

The lava fountain produced an overflow of lava along the southern slope of the southeast crater, which spread in a southwest direction. On the east side, a third small lava flow is still observed, generated from the effusive vent at an altitude of 3050 m., During the last episode of the fountain.

 

Source: INGV OE

Fagradalsfjall - 06.26.2021 / 00:10 - webcam langihryggur NV

Fagradalsfjall - 06.26.2021 / 00:10 - webcam langihryggur NV

Fagradalsfjall - 06.26.2021 / 01:34 - webcam slaga NNA

Fagradalsfjall - 06.26.2021 / 01:34 - webcam slaga NNA

At Fagradalsfjall, the Nátthaga Valley appears to be filled with lava from the ongoing eruption ... and is starting to come out. No more obstacles now between the main road and the flow.

Based on the current eruption activity, the lava flow will, in all likelihood, reach Suðurstrandarvegur via Nátthaga in the coming weeks.

The Natthaga Valley is full! 25.06.20210 - Lava starts to come out towards the main road - video Rafn Sigurbjörnsson

A map of soil deformation due to lava effusion in the Reykjanes Peninsula has been uploaded by the University of Iceland. The data taken into account for the period from March 25 to June 23, 2021 are corrected for the deformation of the plate boundary and the seasonal effects.

 

Sources: Almannavarnir, Rafn Sif photos, webcams and Univ. Iceland

Fagradalsfjall eruption - map of soil deformation due to lava effusion - Doc. Un. Iceland / Twitter

Fagradalsfjall eruption - map of soil deformation due to lava effusion - Doc. Un. Iceland / Twitter

More details on the Merapi éruption : between June 18 and 24, 2021, the BPPTKG recorded:

Pyroclastic avalanche flows occurred 17 times with a maximum slide distance of 2,500 m in the southwest and 5 times with a slide distance of 1,400 m in the southeast.

Lava boulder avalanches have been observed 206 times with a maximum slide distance of 2,000 meters to the southwest and 600 m to the southeast.

The volume of the lava dome in the southwest sector is 1,590,000 m³ with a growth rate of 11,400 m³ / day.

Morphological analysis of the peak area based on photos of the southeast sector from June 24 to June 17, 2021 shows an increase in the height of the central dome of 0.5 m. The deformation of Mount Merapi, which was monitored by EDM this week, showed a distance shortening rate of 2 cm / day.

Merapi - seismicity from 18 to 24.06.2021 - Doc. BPPTKG

Merapi - seismicity from 18 to 24.06.2021 - Doc. BPPTKG

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.

 

Sources: BPPTKG

Merapi - map of areas at risk of avalanches and pyroclastic flows - Doc. BPPTKG - Orange spots : hamlets - gray : areas of possible pyroclastic flows.

Merapi - map of areas at risk of avalanches and pyroclastic flows - Doc. BPPTKG - Orange spots : hamlets - gray : areas of possible pyroclastic flows.

Merapi - weekly report as of 06.24.2021 - BPPTKG

Merapi - weekly report as of 06.24.2021 - BPPTKG

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

Etna makes the show with a new eruptive episode on June 24, 2021, which produced lava fountains of three mouths ( " saddle " zone), an overflow of lava towards the southeast, and an eruptive column which reached a height of about 10 kilometers above sea level. After the paroxysm, the effusive mouth was reactivated on the lower south-eastern slope of the South-East Crater, which emits a small flow of wash.

 

Activity in details:

During the night and dawn of June 24, weak effusive activity continued at the open mouths at the southeast base of the southeast crater, which fed a lava flow to the west wall of theValle del Bove with a front at about 2600 m. At dawn today a small stream was bustling near the effusive mouth, a few tens of meters long.

Etna SEC - 06.24.2021 / 9.45am - therm webcam. EMCT / INGV

Etna SEC - 06.24.2021 / 9.45am - therm webcam. EMCT / INGV

and from 09:05 UTC, there is a resumption of Strombolian activity at the Southeast Crater, which is accompanied by the emission of modest amounts of volcanic ash. In addition, the emission of a small lava flow from the lower southeast flank of the crater continues to the South East.

Strombolian activity at the southeast crater gradually turned into a lava fountain, with at least three explosive vents; at the same time an overflow of lava started in a south-westerly direction.

The activity of the lava fountain at three mouths of the southeast crater produced jets of lava 400 to 500 m high, while the eruptive column reached a height of 9 to 10 km above the level of the sea, the dispersion of the eruptive cloud concerns the East-North-East sector of the volcano.

Etna SEC - Activity from 06.24.2021 - photos Gio Giusa  / FB - one click to enlarge
Etna SEC - Activity from 06.24.2021 - photos Gio Giusa  / FB - one click to enlarge

Etna SEC - Activity from 06.24.2021 - photos Gio Giusa / FB - one click to enlarge

The INGV announces at 10:45 UTC that the explosive activity at the Southeast Crater is decreasing sharply. The lava fountains have ceased; the weak strombolian activity continues accompanied by modest ash emissions. There is an ash fall in the Linguaglossa region (northeast side of Mount Etna).

The southwest-facing lava overflow is still fed ; on the other hand, the small lava flow present on the lower southeast flank of the cone seems to cool down before the start of this eruptive episode.

After the cessation of the explosive activity at the level of the Southeast crater, the gradual reactivation of the effusive vent located at an altitude of about 3050 m. on the south-eastern flank of the cone was observed, with the emission of a small lava flow. This flow reached, at 14:20 UTC, an altitude of about 2800 m, and is slowly moving towards the Valle del Bove.

From 23:50 UTC on June 24, an increase in Strombolian activity is observed at the level of the SE crater.

Etna SEC - 06.25.2021 / 01h58 - LAVE webcam

Etna SEC - 06.25.2021 / 01h58 - LAVE webcam

Etna SEC - 25.06.2021 - lava fountain and lava flows - photo Boris Behncke

Etna SEC - 25.06.2021 - lava fountain and lava flows - photo Boris Behncke

Here we go again ... around 01:00 UTC on June 25, from the surveillance cameras, it is observed that the Strombolian activity of the southeast crater gradually turned into a lava fountain.
From around 01:15 UTC an overflow of lava is also observed which, from the southern slope of the southeast crater, spreads in a southwest direction.
At 01:48 UTC, the southeast crater lava fountain ceased to be active, but there remains weak Strombolian activity. The eruptive cloud produced reached a height of about 8.5 km asl. derived from satellite data and, in accordance with the forecast model, its dispersion concerned the eastern sector of the volcano.


Regarding the lava overflow that has spread to the southwest, its front seems to settle at an altitude estimated at about 2900 m. altitude. On the south-eastern side of the south-eastern crater, the lava flow continues from 3050 m. asl. . The effusive vent feeds two main lava flows, the most advanced front of which is located at an altitude estimated at about 2700 m above sea level.
After the maximum amplitude at 01:30 UTC the volcanic tremor began a rapid descent still in progress

 

Sources: INGV OE, Boris Behncke and Gio Giusa

Etna SEC - 06.25.2021 / 02h58 - LAVE webcam

Etna SEC - 06.25.2021 / 02h58 - LAVE webcam

Etna - trémor variations in the late six days - Doc. INGV OE 25.06.2021

Etna - trémor variations in the late six days - Doc. INGV OE 25.06.2021

On June 25, 2021 at 04:43 WIB, three pyroclastic flows were observed at Merapi, and recorded on a seismogram with an amplitude of 75 mm and a duration of 61, 132 and 245 seconds. Maximum glide distance of 3,000 meters to the southeast. The smoke column is observable up to ± 1000 m above the peak.

After the warm clouds this morning, the seismicity was dominated by avalanches. Ash rains were reported in several places. The public is advised to remain calm, to comply with BPPTKG recommendations and to anticipate disturbances due to volcanic ash such as wearing masks and closing water supplies.

 

On June 25, 2021 at 7:33 am WIB, a pyroclastic flow was recorded on a seismogram with an amplitude of 28 mm and a duration of 104 seconds. The glide distance is 1000 m to the southeast. A column of smoke as high as 600 m was observed.

 

Sources: BPPTKG & Magma Indonesia

Merapi - 06.25.2021 / 04:50 - webcam Panguk TRM Badan Geologi

Merapi - 06.25.2021 / 04:50 - webcam Panguk TRM Badan Geologi

Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge
Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlargeMerapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge

Merapi - 06.25.2021 / 4:53 am to 4:59 am - photos Nurrahman '8604' via Rizal and cam. therm. Panguk TRM Badan Geologi - one click to enlarge

Merapi - 06.25.2021 / 07:35 - explosive plume and pyroclastic flow - Panguk webcam

Merapi - 06.25.2021 / 07:35 - explosive plume and pyroclastic flow - Panguk webcam

At Suwanosejima Ontake Crater, eruptive activity has become more active as the eruptions are repeated over a long period of time.

The volcanic alert level went from 2 (crater zone regulation) to 3 (mountain entry regulation), with a danger notice within a radius of 2 km. due to projections of volcanic bombs.

 

The explosions have multiplied since the 20th at the Otake crater: ... 9 times on the 20th, 10 times on the 21st, 15 times on the 22nd, 8 times on the 23rd. On June 24th at 3:00 pm, the observatory counted 6 explosions (provisional number) .

At 10:54 p.m. on June 21 and 12:04 a.m. on June 22, the explosions ejected ballistic projectiles. Large volcanic bombs scattered about 900 m. from the crater in the northwest and southeast directions, respectively.

On top of that, multiple volcanic bombs were scattered from the crater several hundred meters away.

 

Source : JMA

Suwanosejima - 06.22.2021 / 07:26 - JMA webcam

Suwanosejima - 06.22.2021 / 07:26 - JMA webcam

Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam
Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam

Suwanosejima - 06/23/2021 / 6:06 p.m. & 10:50 p.m. - JMA webcam

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The day was eventful on the south-eastern crater of Etna on June 23, 2021.

After the morning activity (see yesterday's article - link), the INGV announces at 14:38 UTC on 23.06, that from the analysis of the images of the surveillance cameras and the surveys carried out in the area summit by the staff of the INGV Etneo Observatory, it is observed that the two effusive mouths opened on the south-eastern flank of the south-eastern crater at an altitude estimated at around 3000 m and 2950 m above sea level.

Currently, the lava flow of the Quote 3000 m mouth is no longer supplied, while that of the Quote 2950 m mouth is still active, although poorly supplied. The front of the latter reached and passed the western edge of the Valle del Bove to reach an altitude estimated at about 2700 m above sea level. The amplitude of the volcanic tremor is maintained at the average level with a gradual tendency to decrease.

Etna - summit craters - Sentinel-2 band image 12,11,4 from 23.06.2021 - one click to enlarge

Etna - summit craters - Sentinel-2 band image 12,11,4 from 23.06.2021 - one click to enlarge

From approximately 17:45 UTC, a further increase in Strombolian activity at the level of the Southeast crater is observed from the surveillance cameras with the emission of ash which, according to the forecast model, disperse in the direction ESE.

Around 18:00 UTC, we observe that the Strombolian activity of the Southeast crater has gradually passed to a lava fountain
Based on the forecast model, the eruptive cloud, which reaches a height of about 9 km above sea level, disperses in an east-northeast direction. In addition, from 18:28 UTC, we observe the opening of an eruptive vent on the upper eastern slope of the Southeast Crater which produces explosive activity and a lava flow which propagates in an easterly direction. From 18:38, we also observe an overflow of lava that propagates in a southwest direction.

Etna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlargeEtna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlarge

Etna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlarge

Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke
Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke

Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke

Etna SEC - 23.06.2021 / 28h39 - webcam INGV

Etna SEC - 23.06.2021 / 28h39 - webcam INGV

As of 19:00 UTC, the lava fountain in the southeast crater gradually depleted.
After the activity of the lava fountains at the Southeast Crater stopped, a weak Strombolian activity with ash emission continued for a few tens of minutes, which gradually disappeared. During the night and at dawn a weak effusive activity continued at the open mouths at the south-eastern base of the south-eastern crater, which fed a lava flow on the western wall of the Valle del Bove with a front at about 2600 m. At dawn today a small stream was bustling near the effusive mouth, a few tens of meters long.

 

Source: INGV OE

Soufriere de St. Vincent - steam emissions in the crater - flyby by Javid Collins, UWITV on 06.21.2021.

Soufriere de St. Vincent - steam emissions in the crater - flyby by Javid Collins, UWITV on 06.21.2021.

La Soufrière in St. Vincent - SCIENTIFIC UPDATE 06/22/21 1:00 PM


The seismic activity at La Soufrière, St Vincent has remained weak since the tremor associated with the explosion and the ejection of ash on 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 in the crater continue to be detected but do not indicate that an explosive event is imminent but that there is a heat source, most likely a small body of magma remaining, near the floor of the summit crater.
The sulfur dioxide flux measurement was taken off the west coast on June 18 and gave an average SO2 flux of 479 tonnes / day. SO2 can be an indicator of the outgassing of fresh magma from a deeper source.
An increase in the smell of sulfur in the Richmond and Chateaubelair areas has also been reported. This can happen when the wind direction drives the SO2 plume towards that direction.

The volcano continues to be in a state of turmoil. While volcanic activity is on the decline, the continued presence of near-surface hotspots, daily seismic activity, and substantial outgassing are evidence that the system is still in turmoil and that an escalation in activity may always take place with little or no warning.

The volcano is at the ORANGE alert level.

Source: UWI-SRC

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

During the week of June 14 to 20 at Etna,

- Strombolian activity, lava fountains and the formation of eruptive columns were observed at the southeast crater;

- an occasional ash emission at the northeast crater and a pulsed degassing with low ash emissions at the Bocca Nuova crater are mentioned by the INGV, as well as an ordinary degassing at the Voragine crater.

New eruptive crises occurred on June 22 and 23.

Etna - the South-East crater flows on June 14, 16, 17 and 2021 - INGV OE cards
Etna - the South-East crater flows on June 14, 16, 17 and 2021 - INGV OE cards

Etna - the South-East crater flows on June 14, 16, 17 and 2021 - INGV OE cards

Details on the 41st crisis, the most recent:

on June 23 from 00:30 UTC, it is possible to observe, from surveillance cameras, the resumption of Strombolian activity at the Southeast crater from at least three eruptive vents.
As of 02:13 UTC, there is also an overflow of lava from the southeast crater that extends in a southwest direction.

 

Around 02:44 UTC, we observe that the Strombolian activity of the Southeast crater has transformed into a lava fountain.

At 03:17 UTC, based on surveillance camera footage, the southeast crater lava fountain was observed to have ceased.

The eruptive cloud produced exceeded the height of 9 km asl. and according to the forecast model, its dispersion concerned the eastern sector of the volcano with lapilli falling at Fornazzo and Giarre.

Regarding the lava overflow, it seems poorly fed and the front seems to be at the same level as that indicated before, at about 2900 m altitude. In addition, at the end of the lava fountain phase, it was possible to observe that the activity of the Southeast Crater produced a second lava overflow from its eastern edge which headed east without exceeding the base of the crater.

 

Sources: INGV OE bulletin and communications

Etna SEC- activity from 23.06.2021 / at 03:28 and 03:58 - new webcam LAVE
Etna SEC- activity from 23.06.2021 / at 03:28 and 03:58 - new webcam LAVE

Etna SEC- activity from 23.06.2021 / at 03:28 and 03:58 - new webcam LAVE

Etna SEC- lava fountain and ash plume - photo 23.06.2021 Boris Behncke

Etna SEC- lava fountain and ash plume - photo 23.06.2021 Boris Behncke

The Fagradalsfjall eruption, which began in Geldingadalur on March 19, has now been going uninterrupted for almost three months. During this time, the rash changed rhythm several times. New craters opened or closed, lava flows increased, and their composition changed. The eruption has been a huge challenge for scientists, especially when it comes to predicting the channeling and behavior of lava flows.

The Meteorological Office and the University of Iceland have collaborated on the use and development of lava flow models as part of a project funded by the RANNÍS Research Fund. Lava flow models can continue to be useful in preparing emergency plans.

Fagradalsfjall - modeling of lava flows according to 2 scenarios as of 06.22.2021 - Model: Meteorological Office / University of Iceland / Gro Birkefeldt Möller Pedersen - one click to enlarge

Fagradalsfjall - modeling of lava flows according to 2 scenarios as of 06.22.2021 - Model: Meteorological Office / University of Iceland / Gro Birkefeldt Möller Pedersen - one click to enlarge

It is not known how long the eruption will last, but it is important to try to predict possible dangers and damage to infrastructure based on development. Attention is now focused on Nátthaga south of the eruption sites and the effect of the lava flow from there on Suðurstrandarvegur and the area down to the sea.

A model is proposed for two possible lava flow scenarios south of Nátthaga. The scenarios assume a lava flow of 3.1 km³ on the one hand and 29 km³ on the other. There is considerable uncertainty as to how long it will take the Nátthaga area to fill before lava begins to flow from the valley.

(Model: Meteorological Office / University of Iceland / Gro Birkefeldt Möller Pedersen)

 

Source: IMO

Sabancaya - activity from June 14 to 20 - report by I.G. Peru

Sabancaya - activity from June 14 to 20 - report by I.G. Peru

Between June 14 and 20, activity in Sabancaya, Peru, remained at a moderate level, with an average of 80 explosions per day, accompanied by ash plumes up to 2,300 meters above the summit.

During the period analyzed, I.G. Peru detected 1,026 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids. Volcano-tectonic earthquakes, from M 1.8 to 3.5, occurred NE and NW of the volcano.

No significant deformation anomaly, and 7 thermal anomalies, with a maximum value of 15 MW are identified, in connection with the presence of a surface lava body in the crater.

The alert level remains in Naranja, with a ban on access within a radius of 12 km radius.

 

Source: I.G. Peru

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Etna SEC- Lava fountain on 06.22.2021 / 04h28 - LAVE webcam

Etna SEC- Lava fountain on 06.22.2021 / 04h28 - LAVE webcam

The current series of paroxysmal eruptive episodes at Etna proceed at a rather frantic pace, with intervals of just over a day between eruptive crisis.

 

This June 22, from 02:15 UTC, a resumption of Strombolian activity is observed at the level of the Southeast crater.
From around 02:30 UTC, a sudden increase in Strombolian activity is observed with the fall of the products on the external slopes of the CSE crater. In addition, the continuous emission of ash produced by the current activity, according to the forecast model, is dispersed in the NE direction.


Strombolian activity in the southeast crater turned into a lava fountain around 02:55 UTC. In addition, there is an overflow of lava to the southwest.


According to the images of the surveillance cameras, the INGV reports in its 04:13 UTC communication that the explosive activity at the Southeast crater has ceased, the lava overflow that extended in a southwest direction still seems weakly powered.

 

Source: INGV

Etna SEC - 06.22.2021 / 03:21 - INGV EMOV webcam

Etna SEC - 06.22.2021 / 03:21 - INGV EMOV webcam

Etna - variations of the tremor at 06.22.2021 / 06h - Doc. INGV OE

Etna - variations of the tremor at 06.22.2021 / 06h - Doc. INGV OE

Etna SEC - Lava fountain at sunrise this 22.06.2021 - photo Boris Behncke

Etna SEC - Lava fountain at sunrise this 22.06.2021 - photo Boris Behncke

At Otake crater on Suwanosejima, an explosion occurred at 10:54 p.m. on 06/21/2021.

Volcanic bombs were emitted, the largest reached 900 m. northwest of the crater.

On June 22, the explosions became more frequent: 5 explosions were counted between 9 a.m. and 3 p.m., accompanied by an ash plume up to 1,200 m above the crater.

The alert level is at 2 / regulation of the crater area.

The activity on Suwanosjima has been the subject of numerous notices from the VAAC Tokyo since the beginning of June.

 

Sources: JMA & VAAC Tokyo

Suwanosejima- 22.06.2021 / between 07:26 and 07:30 - JMA webcam

Suwanosejima- 22.06.2021 / between 07:26 and 07:30 - JMA webcam

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

Etna and Stromboli volcanoes celebrate the passing of the season in their own way.

Etna SEC - lava fountain 600-700 m high. on 06.20.2021 -photo Boris Behncke / INGV

Etna SEC - lava fountain 600-700 m high. on 06.20.2021 -photo Boris Behncke / INGV

From 21:00 UTC a modest Strombolian activity resumed at the southeast crater of Etna, and around 21:53 UTC, a sudden increase in Strombolian activity is observed with a fall of the products on the external slopes of the CSE crater. In addition, the continuous emission of ash produced by the current activity, according to the forecast model, is dispersed in the direction of SEE.
From 10:15 p.m. UTC, the Strombolian activity of the southeast crater turned into a lava fountain 600-700 m high. The moonlit eruptive column, bent east-south-east, reached a height of 8-9 km. In addition, there is an overflow of lava to the southwest.
The National Institute of Geophysics and Volcanology, Etneo Observatory, reports at 00:13 that from the images of the surveillance cameras, we observe that the explosive activity at the level of the Southeast Crater has ceased, the overflow of lava which s The extension in a southwest direction is still active.

Etna SEC - fountaining on June 20 and 21, 2021 - new webcam LAVE - one click to enlargeEtna SEC - fountaining on June 20 and 21, 2021 - new webcam LAVE - one click to enlarge

Etna SEC - fountaining on June 20 and 21, 2021 - new webcam LAVE - one click to enlarge

Etna - lava fountain and eruptive plume from 06.21.2021 - photo Boris Behncke

Etna - lava fountain and eruptive plume from 06.21.2021 - photo Boris Behncke

Etna - trémor at 06.21.2021 / 05h - Doc. INGV OE

Etna - trémor at 06.21.2021 / 05h - Doc. INGV OE

Etna- summit craters and lava flows of the SEC - image Sentinel-2 bands 12,11,4 di 18.06.2021

Etna- summit craters and lava flows of the SEC - image Sentinel-2 bands 12,11,4 di 18.06.2021

The National Institute of Geophysics and Volcanology, Etneo Observatory, reports that a modest lava overflow occurred in the northern sector of Stromboli; the phenomenon started at 04:05 UTC on June 21, 2021 and sold out within minutes. The lava front cools and it affects only the upper part of the Sciara del Fuoco.

 

Source: INGV OE

Stromboli - trace of the cooling lava flow on 06.21.2021 / 05.59 a.m. - INGV webcam

Stromboli - trace of the cooling lava flow on 06.21.2021 / 05.59 a.m. - INGV webcam

During a follow-up by the security team for the Krakatau Islands Nature Reserve and Marine Nature Reserve on June 19, 2021, the teams observed a white plume, occasionally gray, at the main crater, more or less less thick about 25-100 meters from the summit. The weather is cloudy to rainy,
In general, the condition of the area is monitored to be sure that there are no disturbances that can directly damage the area, but there are still traditional fishermen passing through the area.

Activity level remains at 2 / waspada

 

Sources: 2021.06.19 Anak Krakatau - degassing & Magma Indonesia

Anak Krakatau - thick degassing on 06/19/2021 - photo @krakatau_ca_cal

Anak Krakatau - thick degassing on 06/19/2021 - photo @krakatau_ca_cal

On the Nátthaga lava field, created by the eruption in Geldingadalur, an opening (a skylight) has formed. A drone video shows a river of lava, flowing below the surface of the lava field.
This indicates the presence of a complex network of lava flows which flow under the lava field itself in more or less large tubes / tunnels, and allows this fluid lava on a long journey while keeping its temperature high.

 

Sources: mbls & video Donce Monce

Lava river under the solidified crust of the lava field in Nátthaga - June 20, 2021 - video Donce Monce

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
  Fagradalsfjall - the active cone and the lava flow on 06.20.2021 / 02:19 - RUV webcam - one click to enlarge

 Fagradalsfjall - the active cone and the lava flow on 06.20.2021 / 02:19 - RUV webcam - one click to enlarge

Three months after the start of the Fagradalsfjall eruption, scientists are giving their impressions.

Several factors make the eruption exceptionally interesting, say Magnús Tumi Guðmundsson, geophysicist and Kristín Jónsdóttir, seismologist:

- It is the beginning of a new period of eruption on the Reykjanes peninsula, for 800 years.

- The behavior of the eruption is different: after a very calm start, the lava flow increased to double three months later. Lava filled valleys and depressions and flows around hyaloclastite mounts, formed during subglacial eruptions.

- Fueled by a deep magma coming from the mantle, the eruption could last a long time (from a few years to decades) ... this type of eruption has hardly been observed since the end of the Ice Age at this place, 6,000 years ago.

The bend of the lava tongue that flows into Nátthaga from the southwestern part of Geldingadalur .--- and the protective wall to prevent flow to Nátthagakrik - Doc. Fréttablaðið - Almannavarnir 06.18.2021 - one click to enlarge
The bend of the lava tongue that flows into Nátthaga from the southwestern part of Geldingadalur .--- and the protective wall to prevent flow to Nátthagakrik - Doc. Fréttablaðið - Almannavarnir 06.18.2021 - one click to enlarge

The bend of the lava tongue that flows into Nátthaga from the southwestern part of Geldingadalur .--- and the protective wall to prevent flow to Nátthagakrik - Doc. Fréttablaðið - Almannavarnir 06.18.2021 - one click to enlarge

Fagradalsfjall elgos - In red: The magma today. - in green: The fort. - The purple lines: Possible paths of the lava. There is a risk that it will accumulate on the turn towards Nátthaga and throw itself into Nátthagakrik. The Magma Path also leads to Nátthaga towards Suðurstrandarvegur. Doc. Frettablaðið 18.06.2021 - one click to enlarge

Fagradalsfjall elgos - In red: The magma today. - in green: The fort. - The purple lines: Possible paths of the lava. There is a risk that it will accumulate on the turn towards Nátthaga and throw itself into Nátthagakrik. The Magma Path also leads to Nátthaga towards Suðurstrandarvegur. Doc. Frettablaðið 18.06.2021 - one click to enlarge

No construction work will be done to prevent lava from Geldingadalur from flowing onto Suðurstandarvegur, but the focus will be on protecting the town of Grindavík and the roads surrounding it, according to an announcement by the National Civil Defense Commissioner .

A four meter high and 200 meter long retaining wall is the only thing preventing lava from flowing into Nátthagakrik, from where there is an easy path north, west and south to Suðurstrandarvegur , Grindavík, Svartsengi and Grindavíkurvegur.

 

Sources: interview in RUV & mbls

From 6.15 p.m. on 06.19.2021, a Strombolian activity began at the level of the south-eastern crater of Etna. This activity is accompanied by a modest emission of ash. From 6.30 p.m. a southwest-directed lava overflow began, and from around 6.40 p.m. UTC, a sudden increase in Strombolian activity was observed at the south-eastern crater, which produced a continuous emission of ashes. On the basis of the forecast model, the emission of ash and lapilli is dispersed in the direction of Tremestieri Etneo, Mascalucia, Nicolosi, Catania and the regions further south.
The center of gravity of the volcanic tremor sources is located in the southeastern crater region at an altitude of about 2900-3000 m above sea level.

Etna SEC - lava fountain on 06/19/2021 / 8:59 p.m. - new webcam LAVE

Etna SEC - lava fountain on 06/19/2021 / 8:59 p.m. - new webcam LAVE

From 19:00 UTC, the Strombolian activity in the southeast crater turned into a lava fountain. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the S direction. The effusive activity produced by the lava overflow in the southwest direction continues to be well fed.


According to the images of the surveillance cameras, around 19:30 UTC, we observe that the explosive activity at the Southeast crater has ceased, the lava overflow that extends in a southwest direction is still active.

 

Source: INGV OE

Etna SEC - 06.19.2021 / 9:29 p.m. - new webcam LAVE

Etna SEC - 06.19.2021 / 9:29 p.m. - new webcam LAVE

Etna - trémor at 20.06.2021 / 05h - Doc. INGV OE

Etna - trémor at 20.06.2021 / 05h - Doc. INGV OE

At Stromboli, a lava overflow, which began at 5:15 pm UTC, occurred in conjunction with explosive activity in the northern sector; the lava front cools and affects the upper part of the Sciara del Fuoco.

The trend of the mean amplitude of the volcanic tremor does not show significant changes and the values ​​remain at the average level. GNSS networks and tiltmeters show no significant changes. The TDF incline station data is updated at 16:30 UTC.

 

Source: INGV OE

Stromboli - 19.06.2021 / 20:03 - lava flow in the upper part of the Sciare del Fuoco - INGV webcam

Stromboli - 19.06.2021 / 20:03 - lava flow in the upper part of the Sciare del Fuoco - INGV webcam

The eruption, which began on June 29, 2014 in Manam, Papua New Guinea, continues.

Monitoring is episodic depending on the weather, the rate of satellite photos and measurements of thermal anomalies.

A clearer sky on June 18, 2021 showed a slight hot spot, degassing of steam (white) and sulfur gas (bluish plume).

 

Sources: Sentinel-2 & Mirova

Manam - gas and steam plumes & hot spot on 06/18/2021 - image Sentinel-2 bands 12,11,4

Manam - gas and steam plumes & hot spot on 06/18/2021 - image Sentinel-2 bands 12,11,4

Manam - thermal anomalies at 06.18.2021 - Doc. Sentinel-2 bands 12,11,8A & MODIS thermal volcanic activity - via Mirova

Manam - thermal anomalies at 06.18.2021 - Doc. Sentinel-2 bands 12,11,8A & MODIS thermal volcanic activity - via Mirova

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Etna SEC - ash emission of 06.17.2021 / 09:38 - photo Gio Giusa

 Etna SEC - ash emission of 06.17.2021 / 09:38 - photo Gio Giusa

The INGV announces that from approximately 20:20 UTC on June 17, 2021, a sudden increase in Strombolian activity is observed at the level of the south-eastern crater of Etna, producing a continuous ash emission which disperses in the summit zone and an overflow which propagates towards the SW. The products of Strombolian activity protrude from the rim of the crater falling along the sides of the crater.

From approximately 23:20 UTC, the Strombolian activity of the southeast crater passed to a lava fountain phase.

This stopped at 00.10 UTC. June 18.
From 8:50 am The INGV reports that from the images of the surveillance cameras, we observe that the explosive activity at the level of the South-East crater has ceased, the lava overflow extending in a south-west direction is cooling.

 

Source: INGV OE

Etna - Thermal anomalies as of 06/18/2021 / 9.50 a.m. - image and data Sentinel-2 bands 12,11,8A & MODIS thremal volcanic activity - Doc. Mirova - one click to enlarge

Etna - Thermal anomalies as of 06/18/2021 / 9.50 a.m. - image and data Sentinel-2 bands 12,11,8A & MODIS thremal volcanic activity - Doc. Mirova - one click to enlarge

Etna - variations of the tremor at 19.06.2021 / 06h - Doc. INGV OE - one click to enlarge

Etna - variations of the tremor at 19.06.2021 / 06h - Doc. INGV OE - one click to enlarge

A small thermal anomaly, of VRP 6 MW is reported by Mirova in Kadovar, Papua New Guinea, on June 18, 2021, at the summit of the volcanic island.

Some other anomalies were reported in June, respectively on 10,11,13.

 

Sources: Mirova and Sentinel-2

Kadovar - Small hot spot and degassing on 06/18/2021 - image Sentinel-2 bands 12,11,4

Kadovar - Small hot spot and degassing on 06/18/2021 - image Sentinel-2 bands 12,11,4

Kadovar - thermal anomalies - image Sentinel-2 bands 12,11,8A & MODIS thermal volcanic activity at 06/18/2021 / 00h47 - Doc. Mirova - one click to enlarge

Kadovar - thermal anomalies - image Sentinel-2 bands 12,11,8A & MODIS thermal volcanic activity at 06/18/2021 / 00h47 - Doc. Mirova - one click to enlarge

In Merapi, on Java, the seismicity of this June 19, from 00h to 12h local, is characterized by:

- 113 avalanche earthquakes
- 10 emission earthquakes

- 32 hybrid / multiphase earthquakes
- 8 shallow volcanic earthquakes
- 1 distant tectonic earthquake

The activity level remains at 3 / siaga.

The current potential danger is in the form of lava avalanches and hot clouds in the south-southwest sector covering the Yellow, Boyong, Bedog, Krasak, Bebeng and Putih rivers for a maximum of 5 km and in the south-eastern sector, the Gendol river. up to 3 km. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

Sources: PVMBG & Magma Indonesia

Merapi - degassing on 19.06.2021 / 8:01 am WIB - Doc. Magma Indonesia

Merapi - degassing on 19.06.2021 / 8:01 am WIB - Doc. Magma Indonesia

Merapi - activity since 12.54 WIB on 06.19.2021 - photo Obs.Panguk

Merapi - activity since 12.54 WIB on 06.19.2021 - photo Obs.Panguk

The seismicity of Ili Lewotolok has intensified over the past two days with:

on June 18, 2021 from midnight to midnight:
- 4 eruption earthquakes
- 14 emission / blast earthquakes
- 1 episode of Harmonic tremor
- 3 episodes of non-harmonic tremor
- 1 episode of continuous tremor, with an amplitude of 0.5-1 mm, dominating 0.5 mm.

on 19.06, between 00 and 12 noon:
- 16 eruption earthquakes
- 16 blast / emission earthquakes
- 3 episodes of Harmonic tremor
- 13 episodes of non-harmonic tremor
- 1 episode of continuous tremor, with an amplitude of 0.5 to 1 mm, dominant from 0.5 to 1 mm.

 

The activity level remains at 3 / siaga.
Communities around Mount Ili Lewotolok and visitors / climbers / tourists are recommended not to engage in activities within 3 km of the summit / crater of Mount Ili Lewotolok. The community of Jontona Village should always be aware of the potential threat of weathered material avalanches which may be accompanied by hot clouds from the southeast peak / crater of G. Ili Lewotolok.

 

Sources: PVMBG & Magma Indonesia

Ili Lewotolok - 19.06.2021 / 12h53 WITA- photo Jeffry Pugel via PVMBG - Magma Indonesia

Ili Lewotolok - 19.06.2021 / 12h53 WITA- photo Jeffry Pugel via PVMBG - Magma Indonesia

Ili lewotolok - seismicity on 06/18/2021 - N.B.: net change on 06/17 and 06/18 - Magma Indonesia - one click to enlarge

Ili lewotolok - seismicity on 06/18/2021 - N.B.: net change on 06/17 and 06/18 - Magma Indonesia - one click to enlarge

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Merapi - June 17, 2021 at 7.10 WIB, a pyroclastic flow is moving over 2000 m. South West direction- Merapi observatory photo

Merapi - June 17, 2021 at 7.10 WIB, a pyroclastic flow is moving over 2000 m. South West direction- Merapi observatory photo

At Merapi on June 17, a white fumarole is observed at the main crater, with moderate to thick intensity, about 200 meters from the summit.

A hot cloud (PDC) was observed with a sliding distance of 2000 m towards the southwest.

Two lava avalanches were observed to the southwest with a maximum slide distance of 1000 m and to the southeast with a slide distance of 900 m. Six avalanches of incandescent lava were observed with a maximum sliding distance of 1,200 meters to the southwest.
Thanks to the seismographic recordings of June 17, 2021, it was recorded:
- 4 earthquakes related to pyroclastic flows of collapse
- 164 avalanche earthquakes
- 18 blast / emission earthquakes
- 21 hybrid / multiphase earthquakes
- 2 distant tectonic earthquakes

Merapi: seismology of the week, and details on that of June 17 / 00-24h. Doc. BPPTKG

Merapi: seismology of the week, and details on that of June 17 / 00-24h. Doc. BPPTKG

Merapi - 06.18.2021 / 12:39 a.m. - Frekom webcam

Merapi - 06.18.2021 / 12:39 a.m. - Frekom webcam

The activity level remains at 3 / Siaga.

The current potential danger is lava avalanches and hot clouds in the south-southwest sector covering the Boyong, Bedog, Krasak, Bebeng and Putih rivers for a maximum of 5 km. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

Sources: PVMBG, Magma Indonesia and BPPTKG

Gunung api Ibu - 16.06.2021 / 08h00 - gray plume - Magma Indonesia webcam

Gunung api Ibu - 16.06.2021 / 08h00 - gray plume - Magma Indonesia webcam

In the Moluccas, the Ibu volcano is on alert 2 / waspada; a white-gray plume surmounts the summit and the growing dome, from 200 to 800 meters on June 17, 2021.

Seismicity is characterized by:
- 63 eruption earthquakes, with an amplitude of 15-30 mm and an earthquake duration of 19-65 seconds.
- 53 avalanche earthquakes, with an amplitude of 3-24 mm and an earthquake duration of 25-60 seconds.
- 46 bursts of earthquakes with an amplitude of 5 to 14 mm and a duration of 10 to 35 seconds.
- 10 episodes of harmonic tremor
- 2 distant tectonic earthquakes

Communities around Mt Ibu and visitors / tourists should not move within a 2.0 km radius and the sector expansion is 3.5 km towards the crater opening in the northern part of the active crater of Mt. Ibu.
In case of ash rain, people active outside the home are advised to use nasal, mouth and eye protection.

 

Sources: PVMBG, Magma Indonesia

Ibu - Seismicity at 174.06.2021- Doc. PVMBG-Magma Indonesia

Ibu - Seismicity at 174.06.2021- Doc. PVMBG-Magma Indonesia

The INGV communicates that Strombolian activity continues at the south-eastern crater of Etna. This activity is accompanied by ash emissions which vary in intensity and frequency.


On June 17, 2021 from approximately 20:20 UTC, a sudden increase in Strombolian activity is observed at the level of the Southeast crater, which produces a continuous emission of ash which disperses in the summit area and an overflow that is propagates to the SW. The products of Strombolian activity go beyond the rim of the crater falling along the sides of the crater.

From approximately 23:20 UTC, the Strombolian activity of the southeast crater passed to the lava fountain stage. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the SE direction.
The tendency to increase the mean amplitude of the volcanic tremor continues with very high values. The center of gravity of the volcanic tremor sources is located in the area of ​​the Southeast Crater, at an altitude of about 2900-3000 m above sea level.

The fountaining ceased at 00:10 UTC.
As for the lava overflow directed to the southwest, it continues to be fed.

 

Source: INGV OE

Etna SEC - 06/18/2021 / 00:59 am and 01:29 am - new Lave webcam
Etna SEC - 06/18/2021 / 00:59 am and 01:29 am - new Lave webcam

Etna SEC - 06/18/2021 / 00:59 am and 01:29 am - new Lave webcam

Etna - trémor at 18.06.2021 / 07h - Doc. INGV OE

Etna - trémor at 18.06.2021 / 07h - Doc. INGV OE

In Reykjanes Peninsula, the eruption of Fagradalsfjall continues.

The flows in the valley of Nátthaga continue to slowly advance and especially to thicken.

Access to the active cone is only via path B, which is steeper; it allows a good vision on the crack and the alignment of the eruptive cones.

 

Sources: Sentinel-2, Jarðsöguvinir - Friends of Historical Geology and Pierre Gondolff.

Fagradalsfjall - extension of the lava field and the active site - photo 15.06.2021 P áll Gu ðj ónsson via Jarðsöguvinir - Friends of Historical Geology

Fagradalsfjall - extension of the lava field and the active site - photo 15.06.2021 P áll Gu ðj ónsson via Jarðsöguvinir - Friends of Historical Geology

Fagradalsfjall - image Sentinel-2 bands 12,11,8A from 16.06.2021

Fagradalsfjall - image Sentinel-2 bands 12,11,8A from 16.06.2021

Fagradalsfjall - 06.16.2021 - View of the crack and the alignment of the cones - photo Pierre Gondolff

Fagradalsfjall - 06.16.2021 - View of the crack and the alignment of the cones - photo Pierre Gondolff

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

At Etna, the week of June 7 to 13, 2021 was characterized by

- Strombolian activity with an eruptive episode at the south-eastern crater;

- the occasional emission of ash at the northeast crater;

- and pulsed degassing with low ash emissions at the Bocca Nuova crater;

- ordinary degassing at the Voragine crater.

Other episodes took place on June 14 (see yesterday's article), June 15 and 16, 2021.

Etna - Map of the summit craters of Etna and the flows broadcast on June 2, 4 and 12, 2021. BN: Bocca Nouveau, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The topographic reference base on which the morphological updates have been superimposed is the DEM 2014 developed by Laboratoire d'Aérogeophysique - Rome Section 2.

Etna - Map of the summit craters of Etna and the flows broadcast on June 2, 4 and 12, 2021. BN: Bocca Nouveau, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The topographic reference base on which the morphological updates have been superimposed is the DEM 2014 developed by Laboratoire d'Aérogeophysique - Rome Section 2.

Etna - 06.15.2021 - new LAVE webcam

Etna - 06.15.2021 - new LAVE webcam

From approximately 11:32 UTC on June 16, a sudden increase in Strombolian activity is observed at the level of the southeast crater, which produces a continuous emission of ash scattered in the summit area. The products of Strombolian activity protrude from the rim of the crater falling along the sides of the crater.
At 11:47:22 (UTC) the INGV reports that Strombolian activity has passed to the lava fountain stage. In addition, an overflow of lava is observed from the southern flank of the southeast crater which extends in a southwest direction.

The southeast crater lava fountain ceased at 12:50 UTC.
Regarding the lava flow we observe that the one directed towards the southwest continues to feed and there is also a second lava flow produced by a second overflow of the southeast crater which extends towards the Valle del Bove.

Etna - 06.16.2021, at 12:12 UTC fountaining and 13:15 UTC- and end of fountaining and flows - therm webcam. INGV - one click to enlargeEtna - 06.16.2021, at 12:12 UTC fountaining and 13:15 UTC- and end of fountaining and flows - therm webcam. INGV - one click to enlarge

Etna - 06.16.2021, at 12:12 UTC fountaining and 13:15 UTC- and end of fountaining and flows - therm webcam. INGV - one click to enlarge

Etna, Stromboli, and Semisopochnoi activity.
Etna SEC - 06.16.2021 - INGV / Twitter

Etna SEC - 06.16.2021 - INGV / Twitter

Etna - trémor on 06.17.2021 / 05h - Doc. INGV OE - One click to enlarge

Etna - trémor on 06.17.2021 / 05h - Doc. INGV OE - One click to enlarge

And at 3:20 p.m. UTC, there is the resumption of Strombolian activity at the Southeast Crater.
The effusive activity produced by the two overflows is terminated and the lava fronts are cooling.

 

Sources: INGV OE & INGVvulcani.

Stromboli - landslide on 06.16.2021 / 1:26 p.m. - INGV webcam

Stromboli - landslide on 06.16.2021 / 1:26 p.m. - INGV webcam

Stromboli - 06.16.2021 / 2:21 p.m. - webcamINGV

Stromboli - 06.16.2021 / 2:21 p.m. - webcamINGV

At Stromboli, at 13:28:50 UTC on June 16, during an explosion at the northeast crater, at around 600 asl. A landslide was triggered which caused a rolling of material which detached from the altitude previously mentioned. The phenomenon lasted a few minutes. Since 13:28 hours UTC, the INGV has recorded a seismic signal lasting approximately 2 minutes, associated with the event.

 

At 4:46 p.m. UTC, a second landslide occurred along the Sciara del Fuoco at an altitude of about 450 m. Activity at the summit craters has not registered any significant changes from the previous press release.
At 16:46 UTC, a low energy seismic signal was recorded, which may be associated with the landslide event observed by surveillance cameras.

 

Source: INGV

Semisopochnoi - 06.06.2021 / 12h - Doc. AVO / Ellie Boyce

Semisopochnoi - 06.06.2021 / 12h - Doc. AVO / Ellie Boyce

No ash emission or explosion has been detected at Semisopochnoi  in satellite or infrasound data since May 30, and the level of seismic activity has been relatively low. Satellite views over the past few weeks have detected high surface temperatures and emissions of sulfur dioxide have been observed repeatedly, indicating continued volcanic unrest, but no recent ash deposition has been observed.

Due to the low level of seismicity and the lack of significant explosive activity, AVO lowers the Aviation Color Code and Volcanic Alert Level to Yellow / Advisory.

 

Source: AVO-USGS

Semisopochnoi - image Sentinel-2 bands 8,4,3 from 06.10.2021 - one click to enlarge

Semisopochnoi - image Sentinel-2 bands 8,4,3 from 06.10.2021 - one click to enlarge

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