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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

.In the Ryukyu arc, the Mitake crater of Suwanosjima is still producing explosions.

The JMA noted an explosion on July 22 at 10:47 p.m., accompanied by a gray plume 1,200 meters above the edge of the crater.

A new explosion was reported on July 25 at 4:48 p.m., with a colored plume 1,000 meters above the crater, drifting north-east.

At 19:23, the ashes are still observed at 1,100 meters above the crater, north-east direction.

On July 26, the height of the plume was reported at 1,600 meters above the crater.

The activity is ongoing.

 

Source: JMA

Suwanosejima - eruptive plume of 07/23/2020, respectively at 01:17 and 01:21 - JMA webcamSuwanosejima - eruptive plume of 07/23/2020, respectively at 01:17 and 01:21 - JMA webcam

Suwanosejima - eruptive plume of 07/23/2020, respectively at 01:17 and 01:21 - JMA webcam

Suwanosejima - eruptive plume of 07/25/2020, at 141:54 and 16:52 respectively - JMA webcamSuwanosejima - eruptive plume of 07/25/2020, at 141:54 and 16:52 respectively - JMA webcam

Suwanosejima - eruptive plume of 07/25/2020, at 141:54 and 16:52 respectively - JMA webcam

The eruption continues on Nishinoshima with this July 25, 2020 at 3 p.m. a plume of brown ash at 4,400 meters above the crater, drifting north.

On the Nasa worldview satellite image, we can also see a discoloration of the water.

Sentinel-5P / Tropomi detected a strong sulfur dioxide signal near Nishinoshima, with 24.16DU of SO2 at an altitude of 8.12 km.

Sources: JMA, Nasa Worldview, Tropomi and VAAC Tokyo.

 Nishinoshima - plume from 07/25/2020 - image Nasa worldview

Nishinoshima - plume from 07/25/2020 - image Nasa worldview

Nishinoshima - strong sulfur dioxide signal near Nishinoshima on 07/26/2020 with 24.16DU of SO2 at an altitude of 8.12 km. - Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - strong sulfur dioxide signal near Nishinoshima on 07/26/2020 with 24.16DU of SO2 at an altitude of 8.12 km. - Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - Volcanic ash advisory 25.07.2020 / 06h00Z - Doc. VAAC Tokyo

Nishinoshima - Volcanic ash advisory 25.07.2020 / 06h00Z - Doc. VAAC Tokyo

The Sernageomin reported this July 25 at 6:07 p.m. local the recording of an LP earthquake, associated with a moderate explosion in Villarica, accompanied by a slight displacement and infrasonic signal. Direct observation was not possible due to weather conditions.

The technical alert remains at Amarilla.

 

Source: Sernageomin

The Fuego continues its typical activity, this July 25, 2020, with moderate explosions at a rate of 8-12 per hour, accompanied by plumes at 4,700 meters asl., Dispersing over a west / north * west sector over 15 km.

During the night and in the morning, incandescent pulses are observed at 100-200 meters in height, as well as boulder avalanches in the barrancas Seca, Ceniza, Trinidad, Las Lajas and Honda, some of which reach the vegetation zone .

Ash particles are reported on Panimache, Morelia, Santa Sofia, el Porvenir, Palo verde and San Pedro Yepocapa.

 

Source: Insivumeh

Hekla - A graph showing the change in elevation at the foothills of Hekla. The y-axis shows the elevation and the x-axis shows the year. The eruptions of 1991 and 2000 are marked as "Gos". - Doc. Institute of Earth Sciences - University of Iceland

Hekla - A graph showing the change in elevation at the foothills of Hekla. The y-axis shows the elevation and the x-axis shows the year. The eruptions of 1991 and 2000 are marked as "Gos". - Doc. Institute of Earth Sciences - University of Iceland

Measurements made near the Hekla stratovolcano in Iceland indicate a build-up of magmatic pressure that has become considerably greater than during the volcano's last eruption in 1991 and 2000.

The University of Iceland's Institute of Earth Sciences, which carried out the measurements, warns that eruptions in Hekla usually occur suddenly and hikers near the volcano could be at risk if volcanic activity occurs .

"It cannot be guaranteed that people visiting the area can be warned in time to seek shelter before an eruption begins. It should also be noted that eruptions in Hekla often begin with a powerful phreatomagmatic eruption." , says the Institute. "If a group of unprepared hikers were near the eruption, they would have little way to escape."

The measurements were taken near the Næfurholt farm at the foot of Hekla where geologists found that the earth would heave when magma builds up under the volcano, and then fall back after the eruption.

 

Source: Icelandmonitor - Mount Hekla shows signs of strong magmatic pressure.

Lava flows of the Hekla eruption in 1991 - photo Oddur Sigurðsson 1998 / via Icelandic volcanoes

Lava flows of the Hekla eruption in 1991 - photo Oddur Sigurðsson 1998 / via Icelandic volcanoes

Sratovolcano Hekla - photo Evgenia Ilyinskaya via Icelandic volcanoes 14.06.2014

Sratovolcano Hekla - photo Evgenia Ilyinskaya via Icelandic volcanoes 14.06.2014

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

Over the past two weeks, a slight increase in surface eruptive activity has been observed in El Reventador volcano, Ecuador.

The activity is characterized by the generation of eruptive columns and pyroclastic density currents (or pyroclastic flows) generated from the crater of the volcano, which are preferentially directed towards its western, northern and northeastern flanks of the volcano, maintaining its deposits inside the amphitheater. This was confirmed by the presence of thermal anomalies on the eastern flank detected by the infrared camera located on the northeast flank, while thanks to satellite thermal sensors (FIRMS, MIROVA) it is possible to detect activity on the western flank. The heights of gas and ash emissions reach between 0.7 and 1.3 km above the level of the crater and extend for several kilometers to the northwest, west and southwest of the volcano.

 El Reventador - ash plume 500 m high on 07/16/2020 - photo Darwin Yánez, técnico SNGRE / via IGEPN

El Reventador - ash plume 500 m high on 07/16/2020 - photo Darwin Yánez, técnico SNGRE / via IGEPN

El Reventador - 07.22.2020 / 02:46 UTC - IR image of the pyroclastic flow - Doc. IGEPN

El Reventador - 07.22.2020 / 02:46 UTC - IR image of the pyroclastic flow - Doc. IGEPN

The activity of the El Reventador volcano is currently HIGH with an ASCENDING trend; However, it is important to note that this variation does not exceed the levels observed in the volcano in recent months and years.

The most likely scenario is a continuation of the eruptive activity, with fluctuations. The main scenario proposed involves the recurrent generation of pyroclastic flows (CDP) whose deposits accumulate on the flanks of the volcano.

In this scenario, the main phenomena likely to affect the population are:

- ash falls associated with explosive activity and the remobilization of material lifted by currents of pyroclastic density. This ash, thus generated, is governed by the direction and speed of the wind, which at this time of year is typically strong and directed towards the west. Based on the data available to date, this scenario is most likely in the short term.

- Another phenomenon, less recurrent but probable, is constituted by mudslides (lahars) in rivers (whose sources originate in the volcano), this associated with the occurrence of heavy rains, typical of this region and capable of transporting the material accumulated on the flanks of the volcano.

 

Source: IGEPN

Kilauea - Halama'uma'u- crater lake level and surface variations on August 2, 2019, shows a small green pond about 2m deep, left image. The image on the right, taken on July 21, 2020, shows a lake over 40m deep with bronze to brown undertones and a sharp color border often intersecting the lake. - photo USGS / HVO - one click to enlarge

Kilauea - Halama'uma'u- crater lake level and surface variations on August 2, 2019, shows a small green pond about 2m deep, left image. The image on the right, taken on July 21, 2020, shows a lake over 40m deep with bronze to brown undertones and a sharp color border often intersecting the lake. - photo USGS / HVO - one click to enlarge

Kilauea, one year later:

Over the past year, the Kilauea summit water lake has grown to over 270m long and 131m wide, with an area of ​​over 2.5 hectares. The lake is over 40m deep and has a volume of about 480,000 cubic meters, the equivalent of nearly 200 Olympic swimming pools.

 

Source: HVO - USGS

In the Reykjanes Peninsula, since the start of the intense seismic swarm at Fagradalsfjall on July 18, activity has slowly declined over time. The acquisition of recent satellite images made it possible to map new surface deformations in the area associated with the sequence of large earthquakes that occurred between July 18 and July 20.

Reykjanes Peninsula - InSAR image / Sentinel data, July 16-22, 2020 - Doc. IMO

Reykjanes Peninsula - InSAR image / Sentinel data, July 16-22, 2020 - Doc. IMO

Volcanic systems of the Reykjanes Peninsula
Volcanic systems of the Reykjanes Peninsula

Volcanic systems of the Reykjanes Peninsula

The processing of satellite data clearly shows a deformation signal corresponding to about 3 centimeters of movement along a fault oriented NE-SW in the region of Fagradalsfjall (see black box in the figure above). This fault was identified during the 2017 earthquake swarm that also occurred in this area. Current seismic activity is interpreted as part of a larger-scale volcano-tectonic reactivation event in the Reykjanes Peninsula.

Satellite images also reveal a localized subsidence signal in the Svartsengi region (see photo above - red box). The observed subsidence began between July 16 and 18 (shortly before the major tectonic earthquakes occurred at Fagradalsfjall) and the next satellite image (scheduled for the end of this week) will confirm whether deflation is still in progress or if it has stopped. A modeling of the deformation will be undertaken to verify the origin of this signal.

No significant changes are reported regarding the geochemical measurements carried out this week on the peninsula. In addition, the Svartsengi geothermal power plant reports no changes in its routine measurements.

Ongoing activity on the Reykjanes Peninsula, which began in late 2019, reflects a widespread volcano-tectonic reactivation of much of the peninsula, which currently stretches from Eldey in the west to to Krýsuvík to the east. Activity (including additional earthquakes and magmatic intrusions) is likely to continue, with the focus shifting between different areas along the peninsula.

 

Possible dangers:

- Landslides and rock falls can be triggered by earthquakes, most likely in areas with unstable slopes, steep cliffs and loose material

- Earthquakes of up to M5.5-6 could occur in areas along the Reykjanes Peninsula with the potential to affect the captial region

- A build-up of gas in depressions can occur in very calm winds.

 

Source: IMO

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

Cenapred reports that in the past 24 hours, nine exhalations have been identified at Popocatételt, accompanied by volcanic gases and sometimes small amounts of ash, as well as a moderate explosion, recorded on July 23 at 9:27 p.m.

In addition, 1348 minutes of tremor were counted, including 854 minutes of low amplitude and 494 minutes of moderate amplitude, accompanied by emission of steam, gas and low ash content, with heights up to 2000 meters, in a southwest direction; a slight fall of ash was reported in the following municipalities: Tetela del Volcán, Ocuituco, Atlatlahucán, Yecapixtla, Yautepec and Jiutepec (State of Morelos), as well as Juchitepec, Tepetlixpa, Atlautla, Ozumba and Ecatzingo (State of Mexico).

Popocatépetl - activity of 23.07.2020 / 08:13 - Doc. Cenapred

Popocatépetl - activity of 23.07.2020 / 08:13 - Doc. Cenapred

Popocatépetl - nocturnal incandescence and ballistic projections - photo Luis Garcia 23.07.2020 / Twitter

Popocatépetl - nocturnal incandescence and ballistic projections - photo Luis Garcia 23.07.2020 / Twitter

An incandescence was observed at night above the crater

Since dawn and until late morning, there is a constant emission of water vapor, gas and light amounts of ash dispersed to the southwest.

The Popocatépetl volcano has again marked by a low to medium amplitude tremor episode, accompanying the rise of magma and the construction of a dome.

The visibility by the cameras was affected by the rains so that the activity of the volcano is not visible except for the incandescence.

The alert level remains at Amarillo Phase 2

 

Source: Cenapred

Popocatépetl - 24.07.2020 - rise of the tremor and glow at the top hidden by the rains - Doc. Cenapred

Popocatépetl - 24.07.2020 - rise of the tremor and glow at the top hidden by the rains - Doc. Cenapred

At Raung, on alert 2 / waspada, there have been weak to moderate thermal anomalies in recent days, accompanied by numerous tremor episodes.

Magma Indonesia reports for July 23:

- 25 eruption earthquakes, with an amplitude of 4 to 13 mm and an earthquake duration of 43 to 154 seconds.
- 298 non-harmonic tremor episodes, with an amplitude of 1 to 12 mm and an earthquake duration of 34 to 726 seconds.
- 2 distant tectonic earthquakes.

It is not recommended to be within a radius of 2 km from the crater.

 

Sources: Magma Indonesia & Mirova

Raung - hot spot  24.074.2020 - image Sentinel-2 L1C bands 12,11,4

Raung - hot spot 24.074.2020 - image Sentinel-2 L1C bands 12,11,4

Raung - seismicity at 23.07.2020, marked by the tremor - Doc. Magma Indonesia

Raung - seismicity at 23.07.2020, marked by the tremor - Doc. Magma Indonesia

 Raung - moderate thermal anomalies at 07/23/2020 / 6:10 p.m. - Doc. Mirova_MODIS_logVRP

Raung - moderate thermal anomalies at 07/23/2020 / 6:10 p.m. - Doc. Mirova_MODIS_logVRP

The Copahue, at the Chilio-Argentina border, presented in this first part of July a low level seismic activity, but with an increase in the tremor, associated with the emission of particulate materials, and gas; These are signs of an instability of the volcanic system, associated with that of the hydrothermal system and a drop in the level of the crater lake;

The technical alert is passed to amarilla, and the possible assignment area to 1 km radius around the crater.

 

Source : Sernageomin - activity report from July 1 to 16, 2020

Copahue - gas emission and a little ash this 23.07.2020 - photo Valentina Sepulveda / Valecaviahue - Twitter

Copahue - gas emission and a little ash this 23.07.2020 - photo Valentina Sepulveda / Valecaviahue - Twitter

Also in Chile, the POVI reports that the Villarica infrared network shows this July 23 small sporadic and sound Strombolian explosions, from the depths of the crater.

The monitoring parameters show a low level of activity, marked however by diurnal passive degassing and night incandescence, accompanied by thermal anomalies detected by satellite.

The Sernageomin notices that the behavior of the lava lake fluctuates, and that its location near the surface causes minor explosions that can affect the surroundings of the crater.

 

Sources: Sernageomin & POVI

Villarica - nocturnal incandescence this 07/23/2020 6:18 a.m. - Doc. POVI

Villarica - nocturnal incandescence this 07/23/2020 6:18 a.m. - Doc. POVI

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sangay - Photo M Almeida, IR Image S Vallejo / 06.25.2020 - IG EPN.

Sangay - Photo M Almeida, IR Image S Vallejo / 06.25.2020 - IG EPN.

Sangay - Volcanic ash advisory 22.07.2020 - Doc. VAACWashington

Sangay - Volcanic ash advisory 22.07.2020 - Doc. VAACWashington

This July 22, satellite images allow us to distinguish a cloud of volcanic gas and ash coming from the Sangay volcano, heading west, which could potentially cause ash falls in part of the provinces of Chimborazo, Bolivar, Guayas and Cañar. Current winds favor the distribution of these volcanic products. This phenomenon was persistent during the eruptive period which began in May 2019. It is recommended to take the appropriate measures.

The seismicity consists of 25 LP earthquakes, 238 explosion earthquakes, one emission tremor episode, and 21 harmonic tremor episodes.

 

Source: #IG - AlInstante Informativo VOLCÁN SANGAY No. 079 - link

Popocatépetl - emission of ash and gas on 07/22/2020 / 9h58 - webcamsdeMexico

Popocatépetl - emission of ash and gas on 07/22/2020 / 9h58 - webcamsdeMexico

During the last 24 hours, thanks to the monitoring system of the Popocatépetl volcano, 46 ​​exhalations have been identified, accompanied by volcanic gases and sometimes small amounts of ash. In addition, 101 minutes of low amplitude tremor were counted.

Incandescence was observed overnight.

From 7:59 am and at the time of this report, we observe a constant emission of water vapor, gas and light quantities of ash dispersed towards the west-southwest.

Ash falls are expected in: Ecatzingo, San juan Tepecoculco and San Andrés Tlalamac (EDOMEX) and San Pedro, Tetela del Volcán, Texcala, Jumiltepec, Ocuituco and Yecapixtla. (Morelos)

The volcanic alert level remains at amarillo Fase 2.

 

Sources: Cenapred & WebcamsdeMexico

Asama - steam and gas plume on 07/17/2020 / 7:22 a.m. loc. - Doc. Asama Live

Asama - steam and gas plume on 07/17/2020 / 7:22 a.m. loc. - Doc. Asama Live

Activity on the Asama / Honshu volcano has increased in recent weeks, associated with fluctuating seismicity.

The Japan Meteorological Agency (JMA) reported that the vapor and gas plume rose 400m above the summit on July 22.

A rash could occur without warning.

The warning bulletin states that ballistic impacts from volcanic bombs and pyroclastic flows could affect an area approximately 2 km away from the main crater.

 

Source: JMA

Suwanosejima - 23.07.2020 / 01h17 et01h21 - webcams JMASuwanosejima - 23.07.2020 / 01h17 et01h21 - webcams JMA

Suwanosejima - 23.07.2020 / 01h17 et01h21 - webcams JMA

At 1:17 am on the 23rd, an eruption occurred at Suwanosejima (Mitake crater), and the plume rose to 1100m above the crater rim.

Volcanic ash is flowing from the crater to the northeast, and a large amount of ash fell in the village of Toshima within an hour.

 

Source: JMA

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Etna "saddle cone" SEC - Strombolian activity July 21 / 02:52 - photo Boris Behncke

Etna "saddle cone" SEC - Strombolian activity July 21 / 02:52 - photo Boris Behncke

During the week of July 13-19, intracratical explosive activity was observed mainly affecting the New Southeast Crater (NSEC) and the Voragine (VOR) of Etna, with low ash emissions which quickly dispersed to high altitude and with materials thrown on the crater edges.

On July 15, surveillance cameras recorded a slight increase in the variable Strombolian explosive activity of the aforementioned craters, with ash emissions that quickly dispersed near the summit area and with spatter projections above the edges. from the crater.

This Strombolian activity continued at the "saddle cone" on July 21 in the early hours.

Etna - DEM of the summit area with zoom of sectors linked to the SEC-NSEC system (A) and BN and VOR craters (B). Indented black lines indicate the edge of the upper craters (BN: Bocca Nuova, with the northwest (BN-1) and southeast (BN-2) depressions; VOR: Voragine; NEC: northeast crater; SEC : south-eastern crater; and NSEC: New Southeast Crater. The indented blue line indicates the depression inside the Bocca Nuova. The yellow circles: degassing vents; the red circles: active vents - Doc INGV OE

Etna - DEM of the summit area with zoom of sectors linked to the SEC-NSEC system (A) and BN and VOR craters (B). Indented black lines indicate the edge of the upper craters (BN: Bocca Nuova, with the northwest (BN-1) and southeast (BN-2) depressions; VOR: Voragine; NEC: northeast crater; SEC : south-eastern crater; and NSEC: New Southeast Crater. The indented blue line indicates the depression inside the Bocca Nuova. The yellow circles: degassing vents; the red circles: active vents - Doc INGV OE

Etna - degassing on 21.07.2020 / 08h00, seen from Tremestieri Etnéo- photo Boris Behncke

Etna - degassing on 21.07.2020 / 08h00, seen from Tremestieri Etnéo- photo Boris Behncke

The other summit craters were mainly characterized by outgassing activity.

The fracturing seismicity remains moderate and the amplitude of the tremor on average values. Low infrasonic activity.

Etna's soil deformation monitoring networks did not show significant changes during the week SO2 flux is at a medium-low level.

 

Source: INGV - Weekly bulletin 13,07 - 19,07,2020 - link

Telica - ash explosion on 07/20/2020 / 5:41 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 5:41 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 6:36 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 6:36 p.m. - photo webcam seismic station TELN / Sinapred

In Nicaragua, Sinapred reports small gas and ash explosions at Telica, with release of materials 200 meters above the edge of the crater; these explosions are produced following the obstruction of the conduit by small landslides, and accumulation of gas.

The tremor has increased from 27 to 153 units during the explosion and remains high, indicating a possibility of small explosions in the following hours or days.

It is advisable to stay at least 1.5 km away. from the Telica crater.

 

Source: Sinapred

Fuego - photo archives Conred 05.2020

Fuego - photo archives Conred 05.2020

Insivumeh reports weak to moderate explosions at Fuego, at a rate of 8-11 per hour, accompanied by plumes of gray ash reaching 4,500-4,700 meters asl.

Incandescent projections are observed 100-200 meters above the crater, which generate weak to strong fallout, and avalanches in the direction of the Seca, Tanilyua, Ceniza, lajas and Honda barrancas, with blocks reaching the level of vegetation.

The shock waves are perceived at 20 km from the volcanic perimeter, with vibrations of the roofs and windows.

Ash falls are reported in the villages to the south, Panimache I, Morelia, Santa Sofia, Finca Palo Verde, Sangre de Cristo, Yepocapa, etc.

 Pacaya - lava flows - photos William Chigna 07/20/2020
 Pacaya - lava flows - photos William Chigna 07/20/2020

Pacaya - lava flows - photos William Chigna 07/20/2020

At Pacaya, the volcano's activity ranges from a white fumarole at Mackenney and explosions at about 78-100 meters high.

During the night, three lava flows are observed in a northwest direction, located in an area of cracks in the plateau, about 300 meters long.

Seismicity is marked by the tremor associated with the rise of magma, the production of gas and the movements of lava flows.

The ban on climbing the summit is maintained, because of the risks.

 

Source: Insivumeh

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The Pacaya is in strombolian type activity which is characterized by constant explosions at the Mackenney crater and lava flows.

These lava flows were not recorded between July 14 and 20, but on the morning of July 20, a new flow was recorded by an increase in the energy released (RSAM) compared to the previous days; it does not come from an eruptive focus in the crater area, but from the north-western base of the cone, in front of Cerro Chino, flowing on the plateau in a south-eastern direction.

The ban for everyone to climb the summit is maintained, due to the possible detachment of blocks from the lava flow, and the fall of ballistic material from the crater.

 

Source: Insivumeh - special bulletin 07/20/2020 / 2 p.m. local

Pacaya - decrease in RSAM between July 14 and 20 and increase from the morning of the 20th - Doc. Insivumeh

Pacaya - decrease in RSAM between July 14 and 20 and increase from the morning of the 20th - Doc. Insivumeh

In Raung, on the island of Java, moderate thermal anomalies are still perceived by Mirova between VRP 9 and 41 MW, from July 18 to 21, 2020.

The seismicity of this July 21 from 6 to 12h WIB is characterized by 3 eruption earthquakes with an amplitude of 1-9 mm, lasting 43-630 sec.

The activity level is level 2 / waspada, with a forbidden zone of 2 km in radius.

 

Sources: Magma Indonesia and Sentinel Hub

 Raung - a hot spot is visible in the crater in this image Sentinel-2 bands 12,11,4 from 07.19.2020

Raung - a hot spot is visible in the crater in this image Sentinel-2 bands 12,11,4 from 07.19.2020

Raung - seismicity at 07/19/2020 / Magma Indonesia and moderate thermal anomalies as at 07/21/2020 / Mirova
Raung - seismicity at 07/19/2020 / Magma Indonesia and moderate thermal anomalies as at 07/21/2020 / Mirova

Raung - seismicity at 07/19/2020 / Magma Indonesia and moderate thermal anomalies as at 07/21/2020 / Mirova

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano remained at moderate levels between July 13 and 19, 2020, with the continuous recording of explosions, on average 15 per day, with columns up to 2.4 km high at the top of the volcano and the consequent emission of ash and gas.

About 446 earthquakes of volcanic origin, associated with the circulation of magmatic fluids (magma, gas, etc.) within the volcano have been recorded.

Slight inflation was recorded in the northern sector (Hualca Hualca volcano) and south-eastern flank of the Sabancaya volcano.

Satellite monitoring has identified the presence of 12 thermal anomalies with values ​​between 2 MW and 12 MW, associated with the presence of a lava body on the surface of the volcano's crater.

The volcanic alert remains in Naranja, with a 12 km radius prohibited zone.

 

Source: I.G. Peru

 Sabancaya - Activity from July 13 to 19, 2020 - Doc. I.G. Peru

Sabancaya - Activity from July 13 to 19, 2020 - Doc. I.G. Peru

In Nishinoshima, the cloud cover does not allow the collection of thermal anomaly data, nor good satellite photos.

Sentinel-5P / Tropomi shows a strong sulfur dioxide signal (46.73 DU of SO2 at an altitude of 5.83 km), with a plume heading towards the SSE on July 21, 2020.

Tropomi data for July 17-19 shows that sulfur dioxide emissions transit approximately 9,000 km across the Pacific to the western United States, where they pass over Oregon on July 18.

 

Source: Sentinel-5P / Tropomi.
 

Nishinoshima - strong sulfur dioxide signal nearby the volcano - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - strong sulfur dioxide signal nearby the volcano - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - evolution of the transit of sulfur dioxide emissions over approximately 9,000 km across the Pacific to the western United States, where they pass over Oregon on July 18. - Doc. Sentinel 5P / Tropomi
Nishinoshima - evolution of the transit of sulfur dioxide emissions over approximately 9,000 km across the Pacific to the western United States, where they pass over Oregon on July 18. - Doc. Sentinel 5P / Tropomi

Nishinoshima - evolution of the transit of sulfur dioxide emissions over approximately 9,000 km across the Pacific to the western United States, where they pass over Oregon on July 18. - Doc. Sentinel 5P / Tropomi

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams
 Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams

Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams

The Stromboli surveillance network recorded this July 19) 0300 UTCa major explosion.

The products of the explosion were distributed throughout the crater terrace and on the Sciara del Fuoco.

From the seismic point of view, the phenomenon is characterized by a brief sequence of explosions and an increase in the amplitude of the tremor up to 3:10 UTC

 

Source: Osservatorio Etneo dell'INGV.

Stromboli - 19.07.2020 - explosion at 03h00 UTC - Sismo-acoustic network - Doc.LGS

Stromboli - 19.07.2020 - explosion at 03h00 UTC - Sismo-acoustic network - Doc.LGS

In Ecuador, several ash emissions were observed in Sangay, forming plumes up to 2,000 meters high. above the summit.

VAAC Washington has reported in the past 24 hours 5 ash emissions recorded by satellite at 1,770 meters above the crater, drifting west.

The seismicity of the last 24 hours is characterized by 80 explosions and 15 LP earthquakes. The other parameters are unchanged; the alert level remains at yellow.

 

Source: IGEPN

Sangay overview of 06.25.2020 - Photo M Almeida - IGEPN

Sangay overview of 06.25.2020 - Photo M Almeida - IGEPN

Sangay - Volcanic Ash Advisory 19.07.2020 - Doc. VAAC Washington

Sangay - Volcanic Ash Advisory 19.07.2020 - Doc. VAAC Washington

The Bulusan monitoring network recorded forty-eight (48) volcanic earthquakes during the observation period of the last 24 hours. Ground deformation data from continuous GPS measurements indicates an inflation cycle followed by deflation of the building from late February 2020, while the long term trend since May 2019 indicates that the building is still deflated. These parameters indicate that volcanic processes are underway under the edifice and may be caused by deep degassing or hydrothermal activity or magmatic intrusion.

The level 1 (abnormal) alert status prevails over the Bulusan volcano, which means that it is currently in an abnormal state. Local communities and the public are reminded that entering the permanent danger zone (PDZ) within a radius of four kilometers is strictly prohibited and that vigilance in the extended danger zone (EDZ) of two kilometers in the sector southeast must be exercised due to the increased possibilities for sudden and dangerous phreatic eruptions.

 

Source: Phivolcs

Bulusan - photo C. Newhall / USGS archives

Bulusan - photo C. Newhall / USGS archives

In the Ogasawara Islands, Nishinoshima's activity continues. The ash emissions are partly masked by cloud cover.

The thermal anomalies noted by Mirova oscillate between very high and moderate, from VRP 276 to 761MW on 18.07, and from VRP 26 to 1,084 MW on 19.07.2020. The results may be obscured or attenuated by clouds.

Sentinel-5P / Tropomi reports a strong sulfur dioxide signal near Nishinoshima, with 56.99DU of SO2 at an altitude of 12.86km on July 19.

 

Sources: VAAC Tokyo, Mirova and Tropomi

 Nishinoshima - Thermal anomalies at 07/19/2020 / 01:25 - Doc. Mirova_MODIS_Latest10NTI

Nishinoshima - Thermal anomalies at 07/19/2020 / 01:25 - Doc. Mirova_MODIS_Latest10NTI

 Nishinoshima - 07/19/2020 strong sulfur dioxide signal near Nishinoshima with 56.99DU of SO2 at 12.86 km. Altitude - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - 07/19/2020 strong sulfur dioxide signal near Nishinoshima with 56.99DU of SO2 at 12.86 km. Altitude - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

 Nishinoshima - Volcanic Ash Advisory for 19.07.2020 - Doc. VAAC Tokyo

Nishinoshima - Volcanic Ash Advisory for 19.07.2020 - Doc. VAAC Tokyo

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

Sernageomin raised the technical alert level of Copahue in Amarilla on July 17 at 3.30 p.m. local time.

During the previous months, the seismicity was marked by numerous VLP earthquakes, in relation with the rise of magma to more superficial levels; in addition, in recent days, signs have been observed on the surface, with the emission of particulate materials associated with a column of gas from the active crater, and incandescence. The satellite images indicate a decrease in the volume of the crater lake ... all these signs testify to my presence of a volume of magma at a superficial level.

An area of ​​1,000 meters in radius around the crater is considered as a possible assignment area.

 

Source: Sernageomn OVDAS

Copahue - 16.07.2020 - ash plume - Mayores Sin Limites video / twitter

Copahue - 16.07.2020 - ash plume - Mayores Sin Limites video / twitter

Copahue - 07.16.2020 - video noticias NQN

The Raung alert level on the island of Java was raised to 2 / waspada on July 17.

Today, between 0 and 6 a.m., a total of 26 brown plumes were observed between 50 and 200 meters above the crater.

The seismicity of July 17 is characterized by :

- 98 eruption earthquakes with an amplitude of 2-17 mm and a duration of 40-155 seconds.

- 83 non-harmonic tremor episodes with an amplitude of 1-5 mm, and a duration of 38-399 sec.

The PVMBG recalls the ban on going down into the crater, and camping within a radius of 2 km in the center of the crater, due to the danger of volcanic gases for life.

 

Sources: PVMBG & Magma Indonesia

 Raung - seismicity at 17.07.2020 - Doc. Magma Indonesia

Raung - seismicity at 17.07.2020 - Doc. Magma Indonesia

In Costa Rica, a passive emission occurred at Turrialba on July 16, 2020 at 12:09 p.m., accompanied by an ash plume 200 meters above the crater; it lasted 2 minutes.

This episode was followed by several other very diluted shows during the day.

A peak in the CO2 / SO2 and H2S / SO2 ratios was recorded overnight, before returning to values ​​similar to those of yesterday.

 

Source: Ovsicori

Turrialba - 07/16/2020 / 12:09 - Ovsicori webcam

Turrialba - 07/16/2020 / 12:09 - Ovsicori webcam

A magnitude 4.1 earthquake occurred 4.1 km from Grindavik, on the Reykjanes Peninsula in Iceland.

It was preceded by another of magnitude 3; 2. Both were felt in Grindavik and Reykjanesbaer.

The persistent seismic activity is, according to the IMO, in relation to the deformation due to magmatic intrusions in the earth's crust.

 

Sources: IMO & mbl, is

Reykjanes peninsula - 07/18/2020 - earthquake magnitude at 07:50 - Doc. IMO

Reykjanes peninsula - 07/18/2020 - earthquake magnitude at 07:50 - Doc. IMO

Grindavík with Mount Þorbjörn in the background. - Doc. mbl.is / Kristinn Magnússon

Grindavík with Mount Þorbjörn in the background. - Doc. mbl.is / Kristinn Magnússon

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

After an increase in seismicity linked to gaz emissions from July 13, 2020 (15 earthquakes of blast on July 15, 2020), an eruption started on July 16, 2020 at 13:53 local time (06:53 UTC) at Raung, on the island of Java.

The initial eruption lasted 56 seconds, recorded with an amplitude of 10 mm, with an ash plume estimated at 3,500 meters, or perhaps more by an observer on the ground. As a result, the color of the Air Alert (VONA) changed to Orange.

Flights to and from Bali and regional airports have been canceled due to the threat of ash.

A second VONA was issued at 3:37 p.m. local time, where it is reported that the eruption continues, with an ash plume moving north.

 Raung - slight emissions on July 14, 2020 - Sentinel-2 L2A bands 4,3,2 nat colors - one click to enlarge

Raung - slight emissions on July 14, 2020 - Sentinel-2 L2A bands 4,3,2 nat colors - one click to enlarge

A moderate thermal anomaly was noted by Mirova this July 16 at 3 p.m. UT VRP 10MW, and from 8MW at 6:05 p.m. UT.

The seismicity of July 16 comes in:

- 60 eruption earthquakes, with an amplitude of 2-16 mm, and the duration of the earthquake 45-370 seconds.

- 23 blast earthquakes with an amplitude of 2 to 12 mm and an earthquake duration of 38 to 81 seconds.

- 15 episodes of non-harmonic tremor with an amplitude of 1 to 2 mm and an earthquake duration of 118 to 214 seconds.

- 5 distant tectonic earthquakes, with an amplitude of 3-32 mm, S-P 11-47 seconds and an earthquake duration of 60-164 seconds.

The height of the gas / ash plume and its color began to change on July 16, 2020. The color of the plume indicates the presence of ash brought to the surface.

The number of earthquakes in burst experienced a slight increase but was not followed by the appearance of other types of volcanic earthquakes (shallow volcanic earthquakes, deep volcanic or tremor), not indicating the existence of a supply of magma from the depths under the summit crater of Raung.

The activity level remains at 1, with the recommendation: The public and visitors / tourists are not allowed to descend to the crater at the top and / camp around the peak / lip of the caldera / crater G. Raung because volcanic gases coming out of the crater are dangerous for human life.

 

 The last eruption, of VEI 3, took place from February 1 to August 22, 2015. (GVP)

 

Sources: Magma Indonesia & Global Volcanism Program

Raung - seismicity on July 15 and 16, 2020 - NB: the scales of the number of earthquakes are different - Doc. Magma Indonesia - one click to enlargeRaung - seismicity on July 15 and 16, 2020 - NB: the scales of the number of earthquakes are different - Doc. Magma Indonesia - one click to enlarge

Raung - seismicity on July 15 and 16, 2020 - NB: the scales of the number of earthquakes are different - Doc. Magma Indonesia - one click to enlarge

The activity level of Gunung Agung, on Bali, was lowered from level 3 / Siaga to level 2 / Waspada from July 16, 2020 at 3:00 p.m. WITA. In the level II status (Waspada), it is recommended to the community around G. Agung and to climbers / visitors / tourists not to be located, not to climb and not to practice any activity in the estimated danger zone , which is in the area of ​​G. Agung crater and everywhere within a 2 km radius of the crater.

Visually, a significant decrease in the surface activity of the crater was observed. The period from January 1, 2020 to July 16, 2020 was dominated by a plume emanating from the white crater, of low intensity with a height of about 20-150 meters above the summit. The last eruption occurred on June 13, 2019 at 1:38 a.m. WITA and the surface activity is now dominated by gusts of low to moderate intensity.

Agung - the crater and its cake on 23.01.2020 - photo PVMBG

Agung - the crater and its cake on 23.01.2020 - photo PVMBG

The number of volcanic earthquakes in the past year has generally decreased. This indicates that the movements of the magma still occur inside the volcano, but with a weak intensity.

The thermal anomaly at the crater surface was last detected by the Modis satellite in October 2019, then was no longer observed. This decrease in temperature at the surface of the crater indicates a decrease in the supply of surface magma. Deformation data from G. Agung over the past year shows a tendency towards the deflation pattern and in recent months, the pattern tends to be stable and does not indicate a significant build-up of magma pressure .

 

Source: 16 July 2020 19:10 WIB, Devy Kamil Syahbana, Dr., S.Si. / Magma Indonesia

Santiaguito - photo of Santa Maria and the Santiaguito's complex of domes, including Caliente - photo Francisco Juarez / Insivumeh

Santiaguito - photo of Santa Maria and the Santiaguito's complex of domes, including Caliente - photo Francisco Juarez / Insivumeh

At Santiaguito, the seismicity of July 16, 2020 corresponds to explosions accompanied by ash at 3,400 meters asl. at the Caliente dome, moving for 1 km to the southwest. Some explosions generate aircraft turbine noises, under the pressure of magmatic gases.

The southern flank of the Caliente dome is marked by avalanches of boulders, and nocturnal glow is observed.

 

Source: Insivumeh

BONUS: Poas and its acid lake under a beautiful light - Ovsicori webcam 16.07.2020 / 11h41

BONUS: Poas and its acid lake under a beautiful light - Ovsicori webcam 16.07.2020 / 11h41

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

On July 11, the Japanese Meteorological Agency made observations from the ocean around Nishinoshima using the oceanic observation vessel "Ryofumaru".

At Nishinoshima, a large amount of volcanic ash was continuously ejected from the summit crater, confirming that the active eruption activity was continuing. In addition, large volcanic blocks dispersed to the foot of the pyroclastic cone and red hot lava erupted about 200 m above the edge of the crater overnight.

Nishinoshima - Lava fountain accompanied by bombs, ash plume and gas, rising up to about 200 m above the edge of the crater. A fault-shaped topography was found on the south side of the summit crater (arrow) - Doc. JMA 11.07.2020 / 8.18 p.m.

Nishinoshima - Lava fountain accompanied by bombs, ash plume and gas, rising up to about 200 m above the edge of the crater. A fault-shaped topography was found on the south side of the summit crater (arrow) - Doc. JMA 11.07.2020 / 8.18 p.m.

Nishinoshima - important plume of ash and its extension - doc. JMA 11.07.2020 / 4:12 p.m.

Nishinoshima - important plume of ash and its extension - doc. JMA 11.07.2020 / 4:12 p.m.

 Nishinoshima area requiring caution (about 2.5 km from the summit crater) The topography of the seabed is prior to the eruption and is different from the current situation. - Doc. JMA 07.11.2020

Nishinoshima area requiring caution (about 2.5 km from the summit crater) The topography of the seabed is prior to the eruption and is different from the current situation. - Doc. JMA 07.11.2020

Currently, Nishinoshima has issued a crater warning (danger of Iriyama), and continues to be cautious of volcanic bombs and lava flows that trace the trajectory of the eruption in a range of about 2 , 5 km from the summit crater.

To be continued, on July 20, the JMA will also carry out observations from the sea with the oceanic weather observation vessel "Keifumaru".

 

Source: JMA -https: //www.jma.go.jp/jma/press/2007/15b/nishinoshima_200715.pdf

Ebeko - photo Y.Demyanchuk via Ria Novosti / 22.06.2020

Ebeko - photo Y.Demyanchuk via Ria Novosti / 22.06.2020

In the northern Kurils, a modest eruptive activity continues at the Ebeko, with an explosive plume at 3,100 meters asl. Drifting towards the south-east of the volcano over 5 km.

The aviation code remains in orange, explosions accompanied by ash are possible at any time, up to a height of 6,000 meters.

 

Source: KVERT - 16.07.2020 / 01h56Z

Reventador - Silvana Hidalgo / 05.11.2019 - IGEPN

Reventador - Silvana Hidalgo / 05.11.2019 - IGEPN

The IGEPN reports an upward trend in the surface activity of the Reventador on July 15, 2020.

The seismicity is characterized by 2 earthquakes LP2 explosion earthquakes, 2 episodes of emission tremor and one of harmonic tremor.

At the end of the day, the various gas and ash emissions did not exceed 700 meters above the crater.

The other parameters do not show changes.

The alert level remains in Naranja.

 

Source: IGEPN

Nevados de Chillan - interpretation of Sentinel-2A images on 15.07.2020 at the morphology level of the Nicanor crater and its flows

Nevados de Chillan - interpretation of Sentinel-2A images on 15.07.2020 at the morphology level of the Nicanor crater and its flows

Analysis of the satellite images of July 13 (SkySatCollect) and July 14 (Sentinel-2A- by the Sernageomin) made it possible to specify the current morphology of the Nicanor crater and the lava flows called "L5" and "L6" of the Nevados de Chillan complex.

The flow "L5" extends over 268 meters from the north edge of the crater,) an average speed of 0.8 m / h. A new lobe has developed and passed the eastern edge of the crater, and descends 55 meters east; it was detected by cameras on July 14.

Another body of lava, called "L6", also exceeded the northern limit of the Nicanor crater, and extends for 194 meters on the northeast flank.

The Sernageomin classifies the flows "L5" and "L6" as distinct: with differences in texture, speed and distribution.

The technical alert remains to amarilla.

 

Source: Sernageomin - REAV 07.15.2020

Nevados de chillan - new risk map as of 15.07.2020 - Doc. Sernageomin

Nevados de chillan - new risk map as of 15.07.2020 - Doc. Sernageomin

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