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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
 Piton de La Fournaise - the eruptive site and the flows 02.04.2020 - image © SAG - PGHM via OVPF

 Piton de La Fournaise - the eruptive site and the flows 02.04.2020 - image © SAG - PGHM via OVPF

Piton de La Fournaise - the eruptive site, its lava fountains and the flows 02.04.2020 - image © SAG - PGHM via OVPF

Piton de La Fournaise - the eruptive site, its lava fountains and the flows 02.04.2020 - image © SAG - PGHM via OVPF

The eruption that started on April 2, 2020 around 12:20 local time at Piton de La Fournaise continues.

Following the seismic crisis, no earthquake had been recorded. As Aline Peltier explains in an interview with LINFO. Re, this particular case of propagation without seismicity is to be related to an environment already weakened by the eruption of February 2020 and those of 2019, which took place on the same flank.

A second particular characteristic: the eruption started very quickly, in less than 2 days from the first warning sign, because very little magma had been emitted on the surface in February, making it available quickly. 

Piton de La Fournaise - Location map of the eruption tremor, 04/02/2020 between 1:15 p.m. and 1:30 p.m. (local time) (© OVPF / IPGP).

Piton de La Fournaise - Location map of the eruption tremor, 04/02/2020 between 1:15 p.m. and 1:30 p.m. (local time) (© OVPF / IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) since 02/04/2020 00h on the seismological station DSO located at the top of the volcano. (© OVPF / IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) since 02/04/2020 00h on the seismological station DSO located at the top of the volcano. (© OVPF / IPGP).

The intensity of the volcanic tremor (indicator of the intensity of the eruption) after an increase phase at the start of the eruption has been relatively stable over the past two hours. An overview of the SAG and the PGHM confirmed the opening of a crack on the eastern flank of the volcano about 1.7 km from the center of the Dolomieu crater at around 1900 m above sea level. This crack is located slightly below the eruption of February 10-16, 2020. During this overflight, the lava fountains did not seem to exceed 30m in height.

A significant signal of sulfur dioxide, with 31.37 DU, is observed by Tropomi above La Fournaise.

Piton de La Fournaise - 02.04. 2020- SO2 emission 0.32 kt - Sentinel-5 P Tropomi image - Doc. DLR / BIRA / ESA

Piton de La Fournaise - 02.04. 2020- SO2 emission 0.32 kt - Sentinel-5 P Tropomi image - Doc. DLR / BIRA / ESA

The estimated surface flows, from satellite data via the HOTVOLC platform (OPGC - University of Auvergne) are greatly disturbed by the bad weather conditions observed around Piton de la Fournaise. The rare measurements carried out, relate to flows of the order of 4 m³ / s but these are probably underestimated.

The Mirova site reports thermal anomalies on April 2 from 16 MW at 10:35 am, and 156 MW at 9:30 pm, attenuated by the clouds.

Piton de La Fournaise - Thermal anomalies on 02.04.2020 / 9:30 p.m. - Doc. Mirova MODIS_logVRP

Piton de La Fournaise - Thermal anomalies on 02.04.2020 / 9:30 p.m. - Doc. Mirova MODIS_logVRP

The island being in Covid-19 confinement, there are few images of the volcanophiles on the spot, the confirmation of the eruption was carried out by helicopter by the volcanologists thanks to the PGHM and the journalists of Imaz Press / http: // www.ipreunion.com/volcan,5/.

But you can still see some nice pictures on the webcams; to note: a beautiful pyrocumulus develops above the flows, seen from the webcam of Piton de Bert, in the evening.

 

Sources: OVPF / IPGP; Mirova; Sentinel-5 P Tropomi; ImazPress; Linfo.Re

Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlargePiton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge
Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlargePiton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge

Piton de la Fournaise - activity at 2:20 p.m., 2:46 p.m., 2:50 p.m. and 3:15 p.m. - OVPF webcams of Piton de Bert and Piton Partages - one click to enlarge

Piton de La Fournaise - incandescence of the eruptive site and formation of a pyro-cumulus - image capture 02.04.2020 / 6:47 pm - HD panoramic camera / copyright: IRT and IPGP-OVPF property

Piton de La Fournaise - incandescence of the eruptive site and formation of a pyro-cumulus - image capture 02.04.2020 / 6:47 pm - HD panoramic camera / copyright: IRT and IPGP-OVPF property

Second day of eruption on Piton de La Fournaise

Piton de La Fournaise - 03.04.2020 / 01h20 TU - OVPF webcam Cascades

Piton de La Fournaise - 03.04.2020 / 01h20 TU - OVPF webcam Cascades

Piton de La Fournaise - pyrocumulus over the lava flows on  03.04.2020 / 02h25 TU - OVPFwebcam Cascades

Piton de La Fournaise - pyrocumulus over the lava flows on 03.04.2020 / 02h25 TU - OVPFwebcam Cascades

In Vanuatu, the VGO signals an increase in the activity of Yasur, on alert 2 / major disorders on 2,3 and 4 April 2020.

Sometimes intense explosions with expulsion of projectiles and volcanic bombs in / and around the summit crater, and the emission of plumes of vapors and gases mark the volcano; the level of risk for visitors entering danger zone A (around the edge of the crater to the parking zone) remains increased.

Areas and villages in the southern part of Tanna can continue to expect ash falls and volcanic gas effects depending on the wind direction (currently northeast direction

 

Source: activity reports of the Vanuatu Geohazards Observatory of April 2 and 3.

Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge
Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlargeYasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge

Yasur - activity, respectively from April 2 at 8:30 am and 1:45 pm, and from April 3 at 9:15 am - Doc. VGO - one click to enlarge

The BPPTKG reports an eruption in Merapi / Java on April 2 at 3:10 pm WIB / 8:10 am Z. It was accompanied by a plume of gas and ash observed at about 3,000 meters above the summit, with a drift to the east. Its imprint on the seismogram is of an amplitude of 78 mm and a duration of 345 seconds.

The activity level remains at 2 / waspada, with a 3 km radius danger zone around the summit, and an orange VONA.

 

Sources: BPPTKG, PVMBG, Magma Indonesia

 Merapi - ash plume of 02.04.2020 / 3.10pm WIB - photo BPPTKG

Merapi - ash plume of 02.04.2020 / 3.10pm WIB - photo BPPTKG

Merapi - summary table of the activity of 02.04.2020 / 00h-24h WIB - Doc. PVMBG

Merapi - summary table of the activity of 02.04.2020 / 00h-24h WIB - Doc. PVMBG

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
La Fournaise on alert 2-2

Following the seismic crisis of April 2 in the morning, between 8:15 a.m. and 8:51 a.m. local time, and after a lull of more than 3 hours, a volcanic tremor, synonymous with the arrival of magma in proximity to the surface, has been recorded since approximately 12:20 local time.

According to the OVPF records, the source of this tremor is located on the eastern flank, at inside the Enclosure.

No visual confirmation of an onset of eruption could be made at this time and
we cannot confirm the arrival of the lava on the surface. Nevertheless the presence
of a tremor shows the emission of hot and incandescent gases on the surface, and
possibility of lava emission.

The recommended alert level is 2-2

 

Source: OVPF

Piton de La Fournaise - RSAM and location of the tremor between 12.54 and 13.09 local time on 04/02/2020 (image © OVPF / IPGP).

Piton de La Fournaise - RSAM and location of the tremor between 12.54 and 13.09 local time on 04/02/2020 (image © OVPF / IPGP).

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

March 2020 was a particularly calm month at Piton de la Fournaise, according to the OVPF:

The replenishment of magma and the pressurization of the surface magmatic reservoir which had resumed following the end of the eruption of February 10-16, ceased around March 10, 2020.

At the same time, seismicity remained low in March, with less than one earthquake per day recorded under the summit craters.

Note that during the last two days of March, 3 and 7 superficial volcano-tectonic earthquakes were recorded.

 Piton de La Fournaise - Histogram representing the number of surface volcano-tectonic earthquakes recorded in March 2020 (© OVPF-IPGP).

 Piton de La Fournaise - Histogram representing the number of surface volcano-tectonic earthquakes recorded in March 2020 (© OVPF-IPGP).

Piton de La Fournaise - Illustration of the deformation over the last six months (October 1, 2019 - March 31, 2020) the eruptive and intrusive periods are shown in red and green respectively. Here are shown the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG ; below) (see location in Figure 5). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP)

Piton de La Fournaise - Illustration of the deformation over the last six months (October 1, 2019 - March 31, 2020) the eruptive and intrusive periods are shown in red and green respectively. Here are shown the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top (reference SNEG; top), at the base of the terminal cone (reference FJAG; in the middle) and in the far field (reference PRAG ; below) (see location in Figure 5). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP)

Since 2016, replenishments of the surface magmatic reservoir under the Piton de la Fournaise have been done in pulses, so such phases of lull in deformations and seismicity have already been observed several times between 2016 and 2019 over periods ranging from 15 to around 80 days.

The still high values ​​of CO2 fluxes in the far field soil show that deeper magma ascent (at the level of the mantle) continues but that these have not yet reached the surface reservoir, at the end of March.

Piton de La Fournaise - seismic cries on 02.04.2020 - (© OVPF-IPGP). - one click to enlarge.

Piton de La Fournaise - seismic cries on 02.04.2020 - (© OVPF-IPGP). - one click to enlarge.

A seismic crisis was recorded on the instruments of the Volcanological Observatory of Piton de la Fournaise this April 2, with 92 superficial volcano-tectonic earthquakes detected between 8:15 am and 8:51 am local time.

This seismic crisis was accompanied by rapid deformation (of the order of 10-20 micro-radians). This indicates that magma has left the surface magmatic reservoir and has spread to the surface.

 This seismic crisis, like the signals, shows:
1) a resumption of seismicity in general under the Piton de la Fournaise massif since March 30,

2) accompanied by a resumption of building inflation for two days,
show that the superficial magmatic reservoir pressurizes again.

 A rash is therefore not ruled out in the medium term.

Alert level: Alert 1

 

Sources:

- OVPF - Monthly bulletin for March 2020. - link

- OVPF - Activity bulletins of April 2, 2020 - link

Santiaguito - 01.04.2020 / 2:45 p.m. - photo Insivumeh

Santiaguito - 01.04.2020 / 2:45 p.m. - photo Insivumeh

In Guatemala, the Santiaguito presented on April 1, 2020 a plume of vapors, accompanied by a little ash 400 meters above the summit, drifting west and southwest over the Palajuno area and the villages of Loma Linda and San Marcos; the explosions remain weak.

 

Sources: Conred & Insivumeh

Ebeko - photo archive 20.01.2020 / Leonid Kotenko

Ebeko - photo archive 20.01.2020 / Leonid Kotenko

In the Northern Kurils, the Ebeko continues its eruptive activity; it is weak and characterized this April 1 by a plume of ash at 1,700 meters asl. , drifting northeast from the volcano for 5 km., according to observations by volcanologists based in Severo-Kurilsk.

The aviation code remains orange, ashes explosions can affect aviation at low altitude.

 

Sources: KVERT & VAAC Tokyo

Popocatépetl - 03.31.2020 / 9.58pm - WebcamsdeMexico

Popocatépetl - 03.31.2020 / 9.58pm - WebcamsdeMexico

Popocatépetl - 01.04.2020 / 02h06 - WebcamsdeMexico

Popocatépetl - 01.04.2020 / 02h06 - WebcamsdeMexico

In the past 24 hours, the Popocatépetl volcano monitoring system has identified 100 exhalations accompanied by water vapor, volcanic gases and slight amounts of ash, as well as an explosion on March 31 at 10:08 a.m.

In addition, there were 500 minutes of tremors, and three volcano-tectonic earthquakes with a calculated magnitude of 1.7, 2.1 and 1.7, respectively.

Since 10 a.m. on April 1, there has been an emission of volcanic gases and slight amounts of ash scattered west-southwest.

The alert remains set to amarillo Fase 2.

 

Sources: Cenapred

Popocatépetl - summary of activity over the past 24 hours - Cenapred / CNPC / Seguridad

Popocatépetl - summary of activity over the past 24 hours - Cenapred / CNPC / Seguridad

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Nevados de Chillan - 29.03.2020 / 9.44 p.m. - Webcam Sernageomin

Nevados de Chillan - 29.03.2020 / 9.44 p.m. - Webcam Sernageomin

At the Nevados de Chillan volcanic complex, explosive activity was recorded on March 29 at around 6:38 p.m. local, with a scattering of ash at low altitude in an east-southeast direction.

It continued on March 30, with grayish emissions reaching a maximum of 1,400 meters.

Volcano-tectonic earthquakes dominate at the seismicity level.

The technical alert is maintained in Amarilla

 

Sources: Sernageomi & Volcanes de Chile

Stromboli - 03.31.2020 - lava overflow in the Scira del Fuoco, at 2:35 and 4:47 respectively - SPCT / INGV OE webcam
Stromboli - 03.31.2020 - lava overflow in the Scira del Fuoco, at 2:35 and 4:47 respectively - SPCT / INGV OE webcam

Stromboli - 03.31.2020 - lava overflow in the Scira del Fuoco, at 2:35 and 4:47 respectively - SPCT / INGV OE webcam

The National Institute of Geophysics and Volcanology, Etnean Observatory, informs that the surveillance networks recorded from 23:40 hours UTC approximately on March 30, 2020, a lava overflow from the crater terrace of Stromboli; lava reached the coast line at approximately 1:50 a.m. UTC on March 31.

At the same time as volcanic phenomenology, there is a seismic signal associated with episodes of rolling incandescent blocks along the Sciara del Fuoco and small landslides that generate clouds of dust.

 

Sources : INGV OE & L.G.S.

Stromboli - lava flow in Sciara del Fuoco - 31.03.2020 / à   01h45 and  6h48  -Doc. LGS

Stromboli - lava flow in Sciara del Fuoco - 31.03.2020 / à 01h45 and 6h48 -Doc. LGS

Stromboli - sismogram 31.03.2020 between 01h and 6h45 - Doc. Seismo-acoustic network LGS

Stromboli - sismogram 31.03.2020 between 01h and 6h45 - Doc. Seismo-acoustic network LGS

Sabancaya - summary of the activity between 23 and 29 March 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 23 and 29 March 2020 - Doc. I.G.Peru

The eruptive activity of the Sabancaya volcano remained at moderate levels between March 23 and 29, with the continuous recording of moderate explosions and the consequent emission of ash and gas. Consequently, for the following days, no significant change is expected regarding its activity.

During the aforementioned period, the IGP recorded and analyzed the occurrence of approximately 536 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) inside the volcano and accompanied columns of gas and ash up to 3 km high above the summit of the volcano, scattered towards the western, southwest and southern sectors of Sabancaya.

In addition, 16 medium to low intensity daily explosions were recorded on average. The monitoring of the deformation of the volcanic structure records significant anomalies.

Satellite surveillance has enabled the presence of 5 thermal anomalies with values ​​between 2MW and 13 MW, associated with the presence of a surface lava body in the crater of the volcano.

The volcanic alert level in orange and it is recommended not to approach within a radius of 12 km.

 

Source: IG Peru
 

Taal - main crater - taken by drone / Phivolcs archives - Raffy Tima

Taal - main crater - taken by drone / Phivolcs archives - Raffy Tima

In Taal volcano, March 29 was marked by 93 volcanic earthquakes, associated with the fracturing of rocks, including 6 of magnitude between M1.8 and M3.4, felt in the barangays Banyaga, Bilibinwang and Subic Ilaya.

Low emissions of steam plumes are observed at the main crater and at the vents along Daang Kastila Road.

On March 30, the emissions observed reached only 50 to 100 meters in height, drifting to the southwest. THE number of volcanic earthquakes has decreased and is now only 17 events.

The alert level remains at 1 / abnormal; the prohibited zones remain around the main crater and the Daang Kastila crack.

 

Source: Phivolcs

 Reykjanes Peninsula - 30.03.2020 / 5:50 pm - location and magnitude of earthquakes - Doc.IMO
 Reykjanes Peninsula - 30.03.2020 / 5:50 pm - location and magnitude of earthquakes - Doc.IMO

 Reykjanes Peninsula - 30.03.2020 / 5:50 pm - location and magnitude of earthquakes - Doc.IMO

In Reykjanes Peninsula, activity in Grindavík remained high this week after a swarm of earthquakes that started on March 12. This is the same area as where previous earthquake swarms occurred earlier this year.

About 1,000 earthquakes have been located on the Reykjanes Peninsula. The biggest earthquake of the week was M4.2 on March 18, about 5 km NW of Gunnuhver on the Reykjanes Peninsula. The earthquake was widely felt in the southwestern part of Iceland. On March 19, an M3.5 earthquake occurred 3.5 km NW of Grindavík. An M3.0 earthquake occurred on March 20 by Kleifarvatn on the Reykjanes Peninsula, where a small swarm of earthquakes occurred on the same day.

On March 28, 2020, an earthquake swarm occurred on the Reykjanes Ridge. The largest earthquakes in this swarm had a magnitude of Mw3.5. A total of seven earthquakes occurred which were greater than the magnitude Mw3.0.

 

Source: IMO

Reykjanes ridge and peninsula - location and magnitude of the earthquakes of March 29 and 30 / 1:25 p.m. - Doc. IMO
Reykjanes ridge and peninsula - location and magnitude of the earthquakes of March 29 and 30 / 1:25 p.m. - Doc. IMO
Reykjanes ridge and peninsula - location and magnitude of the earthquakes of March 29 and 30 / 1:25 p.m. - Doc. IMO
Reykjanes ridge and peninsula - location and magnitude of the earthquakes of March 29 and 30 / 1:25 p.m. - Doc. IMO

Reykjanes ridge and peninsula - location and magnitude of the earthquakes of March 29 and 30 / 1:25 p.m. - Doc. IMO

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Merapi - 28.03.2020 / 19h26 - explosive eruption - screenshot of the video BPPTKG

Merapi - 28.03.2020 / 19h26 - explosive eruption - screenshot of the video BPPTKG

An eruption occurred at Merapi on on Saturday, March 28, 2020 at 7:25 p.m. West Indonesia time, with an ash column height observed at ± 3000 m above the summit (± 5968 m above sea ​​level). It was observed that the ash column was gray with thick intensity, and directed towards the west. This eruption was recorded on a seismogram with a maximum amplitude of 75 mm and a duration of 243 seconds.

Merapi - 28.03.2020 / 19h26 - explosive eruption - screenshot of the video Volvano YT i Frekom

Merapi - 28.03.2020 / 19h26 - explosive eruption - screenshot of the video Volvano YT i Frekom

March 28, 2020, ~ Eruption ~ Mount Merapi, Indonesia ~ Via VolcanoYT & Frekom

Merapi - 28.03.2020 / 19:26 - Seismogram in UTC time - Doc. Magma Indonesia

Merapi - 28.03.2020 / 19:26 - Seismogram in UTC time - Doc. Magma Indonesia

Merapi - 28.03.2020 / 7:27 p.m. - Doc. BPPTKG

Merapi - 28.03.2020 / 7:27 p.m. - Doc. BPPTKG

Another eruption occurred at Merapi on Sunday, March 29, 2020 at 12:15 a.m. Western Indonesia time, the height of the ash plume being observed at ± 1500 m above the summit. It was observed that the ash column was gray with thick intensity, and directed towards the west. This eruption was recorded on a seismogram with a maximum amplitude of 40 mm and a duration of 150 seconds.

 Merapi - 03.29.2020 / 00:19 am loc. - Doc.BPPTKG

 Merapi - 03.29.2020 / 00:19 am loc. - Doc.BPPTKG

Merapi - 28.03 - 29.03.2020 - Seismogram in UTC time - Doc. Magma Indonesia

Merapi - 28.03 - 29.03.2020 - Seismogram in UTC time - Doc. Magma Indonesia

People are advised to stay calm and not to panic. The alert activity level remains at 2 / waspada. The danger distance is set at a radius of 3 km from the summit of Merapi. Outside this radius, the community can move as usual.

 

Sources: PVMBG, BPPTKG, Magma Indonesia

Stromboli - 28.03.2020 - overflow of the terrace in the sciara del Fuoco, respectively at 7:06 p.m. / LGS and 7:09 p.m. / INGV OE - one click to enlargeStromboli - 28.03.2020 - overflow of the terrace in the sciara del Fuoco, respectively at 7:06 p.m. / LGS and 7:09 p.m. / INGV OE - one click to enlarge

Stromboli - 28.03.2020 - overflow of the terrace in the sciara del Fuoco, respectively at 7:06 p.m. / LGS and 7:09 p.m. / INGV OE - one click to enlarge

This March 28, 2020 at 16:44 UTC, the geophysical monitoring network of the Laboratory of experimental geophysics #LGS of the Department of Earth sciences of the University of Florence recorded an increase in the seismic tremor at Stromboli, accompanied by events of roll (such as "rockfall"), the longest of which (approximately 3 minutes) took place at 16:57 UTC.

This phase of increase in tremors is associated with an overflow, that is to say an overflow of lava, from the NE crater as in the images of the Labronzo camera and caused the collapse of small portions of the edge of the crater.

 

At the moment, there is no significant change in the other parameters monitored. This activity is still ongoing.

 

Source: LGS

 Popocatépetl - 28.03.2020 / 08h16 - WebcamsdeMexico

 Popocatépetl - 28.03.2020 / 08h16 - WebcamsdeMexico

 Popocatépetl - 28.03.2020 / 08h29 - WebcamsdeMexico

 Popocatépetl - 28.03.2020 / 08h29 - WebcamsdeMexico

In the past 24 hours, 128 exhalations have been identified at Popocatépetl, accompanied by water vapor, volcanic gases and small amounts of  ash. Emissions of ash dispersed in the northwest sector (NW). So far, there have been no reports of ash falling. WebcamsdeMexico posted photos of the activity at 8:16 a.m., 8:29 a.m. and 11:55 a.m., viewed from San Nicolás de los Ranchos, Puebla.

In addition, 967 minutes of tremor were recorded.

At the time of this report / 11h local, and from an hour, an emission of volcanic gases and slight amounts of ash dispersed to the northwest (NW) are observed.

The alert level remains at Amarillo Fase 2

 

Sources: Cenapred & Mexico City webcams

 Popocatépetl - 28.03.2020 / 11.58 am - WebcamsdeMexico

 Popocatépetl - 28.03.2020 / 11.58 am - WebcamsdeMexico

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Merapi - 27.03.2020 / 9.44 p.m. - photo Sarkaliurang via BPPTKG

 Merapi - 27.03.2020 / 9.44 p.m. - photo Sarkaliurang via BPPTKG

After the Merapi's eruption of March 27 at 10:56 a.m. loc. (see yesterday's article), a second eruption occurred in the evening, around 9:40 p.m. local, less strong and accompanied by a plume culminating at 1,000 meters, before being knocked down by the winds to the west of the volcano. The trace on the seismogram has an amplitude of 40 mm and a duration of 180 seconds.

The PVMBG also informs for this day two avalanche earthquakes, 20 blast earthquakes, and three hybrid earthquakes.

VAAC Darwin maintains a red aviation code, ashes may be present at flight altitude 230.

The activity level remains at 2 / waspada.

 

Sources: PVMBG, Magma Indonesia, BPPTKG and Vaac Darwin.

 Merapi - 27.03.2020 / 9:44 p.m. - Doc. BPPTKG

 Merapi - 27.03.2020 / 9:44 p.m. - Doc. BPPTKG

Merapi - seismogram of 27.03.2020, showing the 2 eruptions of 03.54 and 14.40 UTC - Doc. Magma Indonesia

Merapi - seismogram of 27.03.2020, showing the 2 eruptions of 03.54 and 14.40 UTC - Doc. Magma Indonesia

Seismicity remains high at Shishaldin, with low level continuous tremor recorded in the past week.

A weak gas plume was commonly observed on webcam images when the views were clear, and high surface temperatures were observed on satellite images.

Eruptive activity appears to be confined to the summit area during this latest period of unrest, which began in mid-March. However, activity could increase with little or no warning, causing lava flows outside the crater, lahars and ash emissions.

The volcanic alert is Watch, and the aviation code orange.

The Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a geodesic and rangefinder network, and remote infrasound and lightning networks.

 

Source: AVO

Shishaldin - gas plume of 03.22.2020 / 12 p.m. - photo McConnell, Angela / via AVO

Shishaldin - gas plume of 03.22.2020 / 12 p.m. - photo McConnell, Angela / via AVO

A moderate explosive eruption of the volcano continues at Klyuchevskoy ; a strombolian activity and gas-vapor emission was noted all week.

Vulcanian activity was noted on March 20 and 25, ash plumes extending east and northeast of the volcano, over 130 km.

Satellite data showed a brilliant thermal anomaly over the summit volcanic crater all week.

This moderate explosive eruption of the volcano continues, and ash explosions up to 5-7 km a.s.l. could happen at any time. The current activity could affect low altitude aviation. The aviation code remains orange.

 

Sources: KVERT & Mirova
 

Klyuchevskoy - thermal anomalies on 28.03.2020 / 02h25 - Doc. Mirova
Klyuchevskoy - thermal anomalies on 28.03.2020 / 02h25 - Doc. Mirova

Klyuchevskoy - thermal anomalies on 28.03.2020 / 02h25 - Doc. Mirova

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 Merapi - eruptive plume of 03.23.2020 / at 10.54 am and 11.00 am - photos BPPTKG
 Merapi - eruptive plume of 03.23.2020 / at 10.54 am and 11.00 am - photos BPPTKG

Merapi - eruptive plume of 03.23.2020 / at 10.54 am and 11.00 am - photos BPPTKG

The Merapi, on Java, still in activity level 2 / waspada, presented on March 27 an eruption (presumably phreatic) at 10.56 loc., characterized by an ash plume estimated at 5,000 meters above the summit and a trace on the seismogram 75 mm amplitude; the earthquake linked to this episode lasted 500 sec.

VAAC Darwin reports ash at flight altitudes 100 and 250, disconnected from the summit, heading southeast. The aviation code is red.

 

The PVMBG also reports, by March 27:

- an avalanche earthquake of 18 sec. / slip distance and direction not observed.

- 10 blast earthquakes, 5 low frequency earthquakes and a shallow volcanic earthquake, of amplitude 7 mm and with a duration of 18 sec.

 

The seismicity of March 16 was characterized by:

- 1 avalanche earthquake, of 15 mm amplitude and with a duration of 22.92 sec.

- 2 hybrid earthquakes, and 2 tectonic earthquakes.

 

Sources: PVMBG, BPPTKG & Magma Indonesia

Merapi - seismogram of 27.03.2020 / UTC hours - Doc.Magma Indonesia

Merapi - seismogram of 27.03.2020 / UTC hours - Doc.Magma Indonesia

 Merapi - 27.03.2020 / 05:00 UTC - Doc.Citra Himawari  - BMKG

Merapi - 27.03.2020 / 05:00 UTC - Doc.Citra Himawari - BMKG

In the past 24 hours, Cenapred has identified 147 exhalations at Popocatépetl, accompanied by gas, a little ash, and two minor explosions, respectively on March 25 at 4:10 p.m. and March 26 at 2:00 a.m.

Meanwhile, the constant emission of volcanic gases, sporadically accompanied by slight amounts of ash is reported, dispersed towards the NNO.

At the seismicity level, 653 minutes of low amplitude tremor and two volcano-tectonic earthquakes were recorded, respectively from M1.2 at 4:34 p.m. on March 25 and from M2.3) at 8:55 a.m. on March 26.

The volcanic alert remains fixed at Amarillo Fase 2.

 

Source: Cenapred / CNPC / Seguridad

Popocatépetl - summary of the activity of 26.03.2020 - Doc. Cenapred / CNPC / Seguridad

Popocatépetl - summary of the activity of 26.03.2020 - Doc. Cenapred / CNPC / Seguridad

An explosion occurred in Manam, Papua New Guinea, generating a plume of about 3,000 meters above sea level and reported by the VAAC Darwin via RNZ.

Manam's last activity dates back to November 2019.

Islanders displaced by the previous series of eruptions are still awaiting proper resettlement on the continent.

 

Source: RNZ & Sentinel-2

 Manam - hot spots visible on these images from 20.03.2020 Sentinel-2 L1C bands 12,4,2 and bands 12,11,4 - one click to enlarge
 Manam - hot spots visible on these images from 20.03.2020 Sentinel-2 L1C bands 12,4,2 and bands 12,11,4 - one click to enlarge

 Manam - hot spots visible on these images from 20.03.2020 Sentinel-2 L1C bands 12,4,2 and bands 12,11,4 - one click to enlarge

Manam - Sentinel-2 L1C image from 2020-03-25 bands 12,11,4

Manam - Sentinel-2 L1C image from 2020-03-25 bands 12,11,4

As a bonus, a photo of Etna this morning all in white, the snow-capped peaks topped with a white plume also

 

Source: EtnaWalk Photo / Etna Map

Etna - Symphony of white on 27.03.2020 in the morning - photo EtnaWalk

Etna - Symphony of white on 27.03.2020 in the morning - photo EtnaWalk

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

桜 島 爆 発 的 噴火 2020 年 03 月 25 日 05 時 39 分 (Sakurajima explosive eruption March 25, 2020 05:39)

An explosion occurred at the Minamidake crater of Sakurajima on March 25, 2020 at 5:39 am. It was accompanied by a gray plume 1,400 meters above the crater, and fallout of incandescent materials on the high slopes. The ash cloud has moved north northeast.

 

Sources: You Tube / 暇 な 親 父 & VAAC Tokyo

This Aso 阿蘇山 (Aso Volcano Museum) Timelapse (25/03/2020) video was created by https://volcanoyt.com/camera/172 Source: RKK

Still on Kyushu, Asosan has been emitting ash plumes, quite diluted, since March 24, observed by webcams and ground observers at an altitude of 1,300-1,500 meters above the summit.

No aviation code has been issued by VAAC Tokyo

 

Source: VAAC Tokyo

 Reykjanes peninsula - location and magnitude of earthquakes at 25.03.2020 / 5:05 pm - Doc. IMO
 Reykjanes peninsula - location and magnitude of earthquakes at 25.03.2020 / 5:05 pm - Doc. IMO
 Reykjanes peninsula - location and magnitude of earthquakes at 25.03.2020 / 5:05 pm - Doc. IMO

Reykjanes peninsula - location and magnitude of earthquakes at 25.03.2020 / 5:05 pm - Doc. IMO

In the Reykjanes Peninsula, activity in Grindavík remained high during the week of March 16 to 22 after a swarm of earthquakes that started on March 12. This is the same area as where previous earthquake swarms occurred earlier this year.

About 1,000 earthquakes have been located on the Reykjanes Peninsula.

The biggest earthquake of the week was M4.2 on March 18, about 5 km NW of Gunnuhver on the Reykjanes Peninsula. The earthquake was widely felt in the southwestern part of Iceland. On March 19, an M3.5 earthquake occurred 3.5 km NW of Grindavík. An M3.0 earthquake occurred on March 20 by Kleifarvatn on the Reykjanes Peninsula, where a small swarm of earthquakes occurred on the same day.

Mt. Þorbjörn - inflation and earthquakes more than 4 km deep between January 20 and March 20, 2020 - Doc. ISOR Iceland GeoSurvey / Twitter

Mt. Þorbjörn - inflation and earthquakes more than 4 km deep between January 20 and March 20, 2020 - Doc. ISOR Iceland GeoSurvey / Twitter

On March 25, at 9:44 am, an M3.4 earthquake occurred just north of Grindavík. The earthquake was felt in Grindavík. Considerable seismic activity has continued in the region in recent weeks due to the deformation of the region. The phase of uncertainty due to the uplift by Mt. Þorbjörn that declared civil protection is still in force

 

Sources: IMO, ISOR / Iceland Geo Survey

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 The fumarole activity of the lava dome of Molodoy Sheveluch volcano on 24 January, 2020. - photo Y.Demyanchuk /  IVS FEB RAS KVERT

The fumarole activity of the lava dome of Molodoy Sheveluch volcano on 24 January, 2020. - photo Y.Demyanchuk / IVS FEB RAS KVERT

The explosive-extrusive eruption of Sheveluch continues in the Kamchatka Peninsula.

This March 25, 2020, the KVERT reports an ash explosion with a plume at 3,300-3,500 meters asl., extending over 45 km to the north.

The Sheveluch dome rises to 2,500 meters, for a maximum height of the volcano at 3,283 meters.

Mirova reports a 20 MW VRP thermal anomaly on 03/25/2010 / 12:05 a.m.

The aviation code remains orange, other ash explosions can occur at any time.

 

Sources: KVERT, VAAC Tokyo and Mirova

Sheveluch - volcanic ash advisory on 25.03.2020 / 06h00Z - Doc. VAAC Tokyo

Sheveluch - volcanic ash advisory on 25.03.2020 / 06h00Z - Doc. VAAC Tokyo

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano remains at moderate levels, with the continuous recording of moderate explosions and the consequent emission of ash and gas.

Nineteen daily explosions of medium to low intensity were recorded, accompanied by plumes of gas and ash up to 3,000 meters above the summit of the volcano, scattered towards the southwest and south sectors of Sabancaya.

At the seismic level, 738 earthquakes of volcanic origin associated with the circulation of internal fluids were recorded.

The monitoring of the deformation of the volcanic structure records significant anomalies.

Satellite surveillance allowed the presence of a thermal anomaly of a value of 1 MW, associated with the presence of a body of lava on the surface of the crater.

Consequently, for the following days, no significant change is expected regarding its activity. The volcanic alert remains orange, with an approach ban within a radius of 12 km around the crater.

 

Source: I.G. Peru
 

Sabancaya - Summary of the activity between 16 and 22 March 2020 - Doc. IGPeru

Sabancaya - Summary of the activity between 16 and 22 March 2020 - Doc. IGPeru

Analysis of the images recorded by the cameras located at 400, 190 and Punta dei Corvi made it possible to characterize the eruptive activity of Stromboli.

During the period from March 16 to 22, 2020, the explosive activity was mainly produced by at least 3 (three) eruptive vents located in the area of ​​the North crater and at least 3 (three) eruptive vents located in the area of Center-South crater. All the vents are placed inside the depression which occupies the crater terrace.

 Stromboli - activity from 23.03.2020 / 17h23 - SQV  webcam / INGV

 Stromboli - activity from 23.03.2020 / 17h23 - SQV webcam / INGV

In the northern zone, the explosions were mainly of low to low intensity (less than 80 m high) to high (more than 150 m high) of coarse materials (lapilli and bombs); the abundant fallout has covered the outer slopes of the area overlooking the Sciara del fuoco and the blocks are rolled until they reach the coast line.

The INGV specifies that on March 19 from 2:50 p.m. UTC and until 4:30 p.m. UTC, intense spattering activity animated one of the north mouths overlooking the Sciara del fuoco, and gave birth to a modest rheomorphic flow in the upper part of the Sciara for a few hundred meters. the

the average frequency of explosions in the North zone was variable, between 7 and 9 events / h.

 

The explosive activity of the Center-South zone caused explosions of mainly fine materials (ashes) mixed with large grains of medium to high intensity (150-250 m in height). The frequency of explosions from the CS area was variable, between 5 and 16 events / h.

 

No significant variation in seismology and deformation. The flow of sulfur dioxide remained at an average level.

 

Source: INGV - weekly bulletin March 16 to 22, 2020 / issued on March 24. - link

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Pacaya - Two lava flows of approximately 250 m. - photo Erikson Morales, Unidad de Prevención en Volcanes –UPV / via Conred

Pacaya - Two lava flows of approximately 250 m. - photo Erikson Morales, Unidad de Prevención en Volcanes –UPV / via Conred

In Guatemala, the Pacaya volcano is in typical Strombolian activity, with incandescent ejections 25 meters high above the Mackenney crater. They feed two lava flows of approximately 250 meters.

The area is clear, with a temperate environment and little wind; the explosions are not audible.

 

Source: Conred

Nevado del Ruiz - 23.03.2020 - ash emissions - SGC webcam

Nevado del Ruiz - 23.03.2020 - ash emissions - SGC webcam

In Nevado del Ruiz, ash and gas emissions were recorded on March 23 at 6:30 a.m., observed by web cameras installed in the volcano area and in Manizales.

The Colombian Geological Survey reports that earthquakes of low energy levels associated with low ash emissions have continued in recent days.

The direction of dispersion of the last emissions was governed by the direction of the wind, mainly to the northeast and southeast of the volcano, and a possible ash fall is expected in the area.

New earthquakes associated with gas and ash emissions are also not excluded.

The activity level continues in yellow or (III) / changes in the behavior of volcanic activity.

 

Source: Servicio Geologico Columbiano

Merapi - 24.03.2020 / 6:16 am - Doc. Volcano YT i Frekom

Merapi - 24.03.2020 / 6:16 am - Doc. Volcano YT i Frekom

The Merapi volcano, on Java, on alert level 2 / waspada, presents on March 23 a moderate to high white plume, with a height of 100-150 meters above the summit, drifting over a large eastern sector.

At the seismicity level, the PVMBG reports:

- 4 earthquakes linked to avalanches, with an amplitude of 2 to 10 mm and an earthquake duration of 13.5 to 43.16 seconds. The sliding distance and the direction of fall are not observed.

- 1 blast earthquake, with an amplitude of 4 mm and an earthquake duration of 15.7 seconds.

- 1 low frequency earthquake with an amplitude of 3 mm and an earthquake duration of 18 seconds.

- 16 hybrid earthquakes, with an amplitude of 2 to 10 mm, S-P 0.3 to 1.3 seconds and an earthquake duration of 5.6 to 10.4 seconds. (the increase in the number of hybrid earthquakes often announces a more important next activity)

- 1 distant tectonic earthquake with an amplitude of 6 mm, S-P 38.4 seconds and 99.4 seconds of duration of the earthquake.

 

Sources: PVMBG and Magma Indonesia

Merapi - activity summary of 23.03.2020 / 00-24h WIB - Doc. PVMBG

Merapi - activity summary of 23.03.2020 / 00-24h WIB - Doc. PVMBG

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