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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
Nevados de Chillan - 07.05.2020 - Sernageomin Portezuelo webcam

Nevados de Chillan - 07.05.2020 - Sernageomin Portezuelo webcam

After the explosion of May 6 (link), Nevados de Chillan was the site of two explosions on May 7, respectively at 7:43 am and 7:51 am local; two lower plumes, 1,800 and 1,500 meters, deposited volcanic material on the northeast flank of the active crater. The activity was associated with a tremor.

 

Source: Sernageomin

Poas - emission of hot and incandescent gases 07.05.2020 / 8.13 p.m. - Ovsicori webcam

Poas - emission of hot and incandescent gases 07.05.2020 / 8.13 p.m. - Ovsicori webcam

In Costa Rica, we will notice the emission of hot and incandescent gases through an orifice opened last year in the old dome (current fumarole mouth) of Poas this May 6 at dawn.

During the day, the hot magmatic gases fed the fumarole, with separate exhalations of 5-6 minutes, with a seismic signature.

The volcano continues to present an average of 300 earthquakes of low frequency and low amplitude per day.

The measured magmatic gas concentrations remain low, with SO2 concentrations of less than 5 parts per million (ppm), an H2S / SO2 ratio of less than 0.1 and a slight decrease in the CO2 / SO2 ratio with values ​​around 0.7.

 

Source: Ovsicori

Klyuchevskoy - thermal anomalies on 08.05.2020 / 02h20 - Doc. Mirova_MODIS_Latest10NTI

Klyuchevskoy - thermal anomalies on 08.05.2020 / 02h20 - Doc. Mirova_MODIS_Latest10NTI

Strombolian activity continues at Klyuchevskoy on May 8, 2020. The lava flow continues to move on the southeast flank of the volcano (the Apakhonchich chute), phreatic bursts and the collapse of loose slag accompany this process. According to satellite data, a gas-vapor plume containing a certain amount of ash extends over approximately 35 km east of the volcano.

The KVERT notes the presence of an ash cloud at 6,000 meters asl. ; aviation code stays orange

 

Sources: KVERT & VAAC Tokyo

Sakurajima - 08.05.2020 / 7:03 am - Doc. JMA

Sakurajima - 08.05.2020 / 7:03 am - Doc. JMA

JMA pinpoints a major eruption at Sakurajima on May 8, 2020 at 7:03 a.m., accompanied by a plume of ash and gas reaching 2,000 meters above the active crater, dissipating towards the northwest.

Other episodes preceded him at 6:53 a.m. and 7:08 a.m.

 

Source: JMA and MyKagoshima

 Sakurajima - 03.05.2020 - open view of Kagoshima Bay and Sakurajima - Sentinel-2 L1C bands 4,3,2 image - one click to enlarge

Sakurajima - 03.05.2020 - open view of Kagoshima Bay and Sakurajima - Sentinel-2 L1C bands 4,3,2 image - one click to enlarge

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Semeru - Sentinel-2 L1C image from 05.05. 2020 bands 12,4,2 - one click to enlarge

Semeru - Sentinel-2 L1C image from 05.05. 2020 bands 12,4,2 - one click to enlarge

According to data from Sentinel-2, Mirova and VAAC Darwin, the activity of Semeru on Java continues.

A lava flow is perceptible on the images of Sentinel-2 of May 5.

Thermal anomalies are noted by Mirova: from VRP 30 to 33 MW on May 4, and from VRP 44 and 29 MW on May 6, respectively at 2:55 p.m. and 5:55 p.m.

The VAAC Darwin mentions an orange aviation code, and ash observed at a flight altitude 140, traveling south on May 7, 2020.

This activity is confirmed by the seismic data provided by the PVMBG / Magma Indonesia

 

Sources: cited in the above report.

Semeru - radiative power on 07.05.2020 / 03h20 - Doc. Mirova_MODIS_logVRP

Semeru - radiative power on 07.05.2020 / 03h20 - Doc. Mirova_MODIS_logVRP

Semeru - sismicity on 06.05.2020 - Doc. PVMBG / Magma Indonesia

Semeru - sismicity on 06.05.2020 - Doc. PVMBG / Magma Indonesia

Moderate eruptive activity continues at Ebeko, in the North Kurils.

A plume of ash was observed on May 7 by volcanologists from Severo-Kurilsk, at 1,900 meters asl, drifting northeast from the volcano.

The aviation code remains orange.

 

Source: KVERT

Ebeko - 07.05.2020 / 07h52 - KVERT webcam

Ebeko - 07.05.2020 / 07h52 - KVERT webcam

On May 6 at 9:45 p.m. UTC / 5:47 p.m. local time, an explosion marked Nevados de

Chillan, accompanied by a plume of ash and gas reaching 2,500 meter high above the emission point, dispersing to the northeast, and a seismic signal of wide period associated with the dynamics of internal fluids.

The alert remains in Amarilla.

 

Source: Sernageomin

Kavachi - Greenish discolored spot spreading south of Vangunu Island (upper center) - Sentinel-2 L1C image from 04.30.2020 bands 4,3,2 - one click to enlarge

Kavachi - Greenish discolored spot spreading south of Vangunu Island (upper center) - Sentinel-2 L1C image from 04.30.2020 bands 4,3,2 - one click to enlarge

Named for a sea god of the Gatokae and Vangunu peoples, Kavachi is one of the most active underwater volcanoes in the southwest Pacific, located in the Solomon Islands south of the island of Vangunu, about 30 km north Indo-Australia subduction site. plate under the Pacific plate. Sometimes called Rejo te Kvachi ("Kavachi oven"), this basaltic to andesitic underwater volcano has produced ephemeral islands up to 1 km long several times since its first eruption recorded in 1939.

 Kavachi - Greenish discolored patch spreading to the south of Vangunu Island - Sentinel-2 L1C image from 04.30.2020 bands 4,3,2 - one click to enlarge

 Kavachi - Greenish discolored patch spreading to the south of Vangunu Island - Sentinel-2 L1C image from 04.30.2020 bands 4,3,2 - one click to enlarge

 Kavachi - Greenish discolored patch spreading to the south of Vangunu Island - Sentinel-2 L1C image from 03.05.2020 bands 4,3,2 - one click to enlarge

 Kavachi - Greenish discolored patch spreading to the south of Vangunu Island - Sentinel-2 L1C image from 03.05.2020 bands 4,3,2 - one click to enlarge

Little news of this volcano, given its underwater status and its remoteness ... however satellite data showed a discoloration of the water around Kavachi from January 2020; discolored plumes have become more frequent, dense and stretched over longer distances.

On April 25, 2020, a satellite image showed a plume in water about 15 km long but spread over an area of ​​approximately 30 square kilometers. A small brown circle of approximately 50,000 square meters indicated the presence of materials on the likely location of the vent.

An image acquired on April 30, 2020 shows a thin ribbon of discolored water stretching about 50 km west of Kavachi. The stain is still visible on an image of May 3.

 

Sources : Global Volcanism Program and Sentinel-2 

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Sangay - lava and plume flow from 04.05.2020 - IGEPN webcam

Sangay - lava and plume flow from 04.05.2020 - IGEPN webcam

In Ecuador, the surface and internal activity of Sangay remains unchanged, and qualified as "High".

On May 5, IGEPN noted 7 explosions, and ash emissions could be observed towards the southwest.

VAAC alerts were recorded with heights of 870 meters above the level of the crater and in a southwest direction.

On the southeast flank, the lava flows remain active, and thermal anomalies are reported by Mirova of VRP 90 MW on May 4 at 6:55 p.m., and of VRP 13 MW on May 5 at 4:20 a.m.

 

A lahar signal was recorded in the volcanic station on the afternoon of May 4, with a duration of 3 hours.

 

Sources IGEPN and VAAC Washington.

Sangay - thermal anomalies on 06.05.2020 / 03h25 - Doc. Mirova_MODIS_Latest10NTI

Sangay - thermal anomalies on 06.05.2020 / 03h25 - Doc. Mirova_MODIS_Latest10NTI

Seismic activity remains high on May 5, 2020 at Anak Krakatau, although slightly down from the previous day with:

- 26 blast earthquakes, with an amplitude of 3-22 mm and an earthquake duration of 6-82 seconds.

- 148 low frequency earthquakes, with an amplitude of 4 to 30 mm and the duration of the earthquake from 4 to 14 seconds.

- 8 hybrid earthquakes, with an amplitude of 6 to 9 mm, the S-P is not observed and the duration of the earthquake is 5 to 10 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-8 mm, dominating 2 mm.

 

The activity level remains at 2 / waspada

 

Sources: PVMBG & Magma Indonesia

Anak Krakatau - seismicity at 05.05.2020 - Doc. Magma Indonesia - one click to enlarge

Anak Krakatau - seismicity at 05.05.2020 - Doc. Magma Indonesia - one click to enlarge

In the week of April 27 to May 3, Etna presented a strombolian activity to Voragine (VOR) and to the new southeast crater (NSEC).

Etna - 03.05.2020 / 10:20 am - photo Casa di paglia Felcerossa.

Etna - 03.05.2020 / 10:20 am - photo Casa di paglia Felcerossa.

Map of the summit crater area (DEM 2014, Aerogeophysics Lab - Section Rome 2, mod.) And detail of the VOR-BN area of ​​Etna. Indented black lines = edge of the upper craters: BN = Bocca Nuova, with the depressions of the northwest (BN-1) and the southeast (BN-2); VOR = sinkhole; NEC = Northeast Crater; SEC = Southeast Crater; NSEC = New southeast crater. The indented blue line indicates a depression inside BN. Yellow dots = degassing vents. Red dots = mouths with eruptive activity. - Doc. INGV OE

Map of the summit crater area (DEM 2014, Aerogeophysics Lab - Section Rome 2, mod.) And detail of the VOR-BN area of ​​Etna. Indented black lines = edge of the upper craters: BN = Bocca Nuova, with the depressions of the northwest (BN-1) and the southeast (BN-2); VOR = sinkhole; NEC = Northeast Crater; SEC = Southeast Crater; NSEC = New southeast crater. The indented blue line indicates a depression inside BN. Yellow dots = degassing vents. Red dots = mouths with eruptive activity. - Doc. INGV OE

At La Voragine, an inspection on April 30 revealed that the effusive activity of the mouth of the principal cone had stopped, in progress since September 12, 2019, and the lava field is being cooled.

Strombolian activity continues on the other hand at the level of the intracrateric cones of the VOR, with gray-black ash emissions several hundred meters high, during the main cone explosions. During the night of May 3-4, the strombolian explosions from the VOR crater appeared particularly energetic, and the coarse material produced fell outside the edges of the crater, settling on the southern flank of the Bocca Nuova crater. .

It was also observed that the depression that formed inside the BN of the crater has increased compared to what was observed during the inspection of April 18, 2020.

Etna - a) Overview of the BN and VOR craters taken during the May 1 inspection from the edge south of BN. The arrow indicates the depression which widens at the bottom of the BN crater (photo M.Coltelli). b) thermal image of the area framed in yellow in a), taken during the inspection on April 30. Active flows are no longer present and the entire lava field cools down (images by L. Lodato). - Doc INGV OE

Etna - a) Overview of the BN and VOR craters taken during the May 1 inspection from the edge south of BN. The arrow indicates the depression which widens at the bottom of the BN crater (photo M.Coltelli). b) thermal image of the area framed in yellow in a), taken during the inspection on April 30. Active flows are no longer present and the entire lava field cools down (images by L. Lodato). - Doc INGV OE

Etna - Thermal images of strombolian activity at the VOR crater from the a) main cone formed on 12/09/2019 and b) from the cone formed on 03/09/2020, photos during the inspection on 1 May (taken by F. Ciancitto). - Images of cameras visible from La Montagnola showing c) strong Strombolian activity in the VOR crater and d) the coarse products of the explosions which fall on the southern flank of the BN crater. - Doc. INGV OE

Etna - Thermal images of strombolian activity at the VOR crater from the a) main cone formed on 12/09/2019 and b) from the cone formed on 03/09/2020, photos during the inspection on 1 May (taken by F. Ciancitto). - Images of cameras visible from La Montagnola showing c) strong Strombolian activity in the VOR crater and d) the coarse products of the explosions which fall on the southern flank of the BN crater. - Doc. INGV OE

 Etna VOR - activity of 03.05.2020 - photo Gianni Pennisi

 Etna VOR - activity of 03.05.2020 - photo Gianni Pennisi

During the week, a pulsatile degassing of the new Southeast crater continued. The presence of flashes at night showed that strombolian activity continued at the level of the "saddle cone", without expelling incandescent materials. Sometimes this activity was accompanied by the emission of reddish ash, quickly dispersed in the atmosphere.

 

Source / INGV OE - weekly bulletin 27.04 / 03.05.2020

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

After a relative rest phase since mid-April, an explosion occurred on May 4 at the start of the day at Merapi, on Java; it was accompanied by a plume about 2,000 meters above the crater (reported by Andi Rosati on Facebook)

Merapi - 04.05.2020 - plume of the explosion at 2,000 m. above the summit - photo Andi volcanist / Facebook

Merapi - 04.05.2020 - plume of the explosion at 2,000 m. above the summit - photo Andi volcanist / Facebook

Magma Indonesia reports for April 4:

- 1 avalanche earthquake, with an amplitude of 6 mm and an earthquake duration of 49.2 seconds. The sliding distance and the direction of fall are not observed.

- 4 blast earthquakes, with an amplitude of 2 to 5 mm and an earthquake duration of 15.7 to 23 seconds.

- 37 hybrid earthquakes, with an amplitude of 2-8 mm, S-P 0.3-0.4 seconds and the duration of the earthquake 5.8-11.4 seconds.

- 1 local tectonic earthquake with an amplitude of 3 mm, and an earthquake duration of 11.9 seconds.

- 1 distant tectonic earthquake with an amplitude of 5 mm, S-P 25 seconds and an earthquake duration of 71.8 seconds.

 

The alert level remains at 2 / waspada, with a 6 km radius prohibited around the summit.

 

Sources: Magma Indonesia, PVMBG, Andi volcanist and Volcano YT.
 

 Merapi - activity table of  04.05.2020 / 00h-24h. - Doc. PVMBG

Merapi - activity table of 04.05.2020 / 00h-24h. - Doc. PVMBG

Merapi (Klangon) Timelapse (04/05/2020) - Doc. Volcano YT / Frekom

The PVMBG noted a sudden increase in seismicity on May 4, 2020 at Anak Krakatau.

 

This seismicity includes:

- 56 blast earthquakes with an amplitude of 11-30 mm, and an earthquake duration of 7-55 seconds.

- 236 low frequency earthquakes with an amplitude of 4 to 26 mm and an earthquake duration of 3 to 15 seconds.

- 13 hybrid earthquakes with an amplitude of 5-30 mm, S-P was not observed and the duration of the earthquake was 6 to 12 seconds.

- 2 shallow volcanic earthquakes with an amplitude of 5-6 mm, and an earthquake duration of 6-10 seconds.

- 1 internal volcanic earthquake with an amplitude of 30 mm, S-P 2.1 seconds and an earthquake duration of 8.2 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-8 mm, dominating 2 mm.

 

This increase in seismicity was preceded by a moderate magnitude 5.0 earthquake with an epicenter located at the southern entrance to Sunda Strait.

 

To be continued ...

 

Sources: PVMBG, Magma Indonesia.

Anak Krakatau - summary of seismicity as of 03.05.2020 - Doc.Magma Indonesia - one click to enlarge

Anak Krakatau - summary of seismicity as of 03.05.2020 - Doc.Magma Indonesia - one click to enlarge

VAAC Darwin issued an intermittent eruption advisory to the Ibu, in the Northern Moluccas on May 4, with plume at flight altitude 70.

Magma Indonesia informs a gray-white plume between 200 and 800 meters above the crater, and at the seismicity level :

- 88 eruption earthquakes, with an amplitude of 15-30 mm, and an earthquake duration of 17-65 seconds.

- 12 avalanche earthquakes with an amplitude of 5-11 mm and an earthquake duration of 17-55 seconds. The sliding distance and the direction of fall are not observed.

- 36 blast earthquakes, with an amplitude of 5-14 mm, and an earthquake duration of 10-35 seconds.

 

Sources: VAAC Darwin and Magma Indonesia

 IBU - eruptive plume of 04.05.2020 / 15.58 WIT - Docc.Magma Indonesia

 IBU - eruptive plume of 04.05.2020 / 15.58 WIT - Docc.Magma Indonesia

The I.G.Peru reports that the eruptive activity of the Sabancaya volcano remains at moderate levels for the week of April 27 to May 3, 2020; that is to say with the recording of explosions, 9 per day on average, with eruptive columns up to 2.5 km high above the summit of the volcano and the consequent emission of ash and gas. Consequently, for the following days, no significant change is expected regarding its activity.

During this period, the occurrence of approximately 298 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) inside the volcano, was recorded and analyzed.

On April 28 and May 2, two earthquakes of magnitude M3.4 and M3.5 occurred, located 12 km south of Maca and 10 northeast of Sabancaya, associated with tectonic activity.

The monitoring of the volcanic deformation of the area, using GNSS data (processed with fast orbits), does not present any significant anomalies.

A 14 MW thermal anomaly, associated with the presence of a lava body, to be identified (dome) on the surface of the crater of the volcano.

 

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

 

Source: I.G. Peru

Sabancaya - activity table from 27.04 to 03.05.2020  - Doc. I.G.Peru

Sabancaya - activity table from 27.04 to 03.05.2020 - Doc. I.G.Peru

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Semeru - small plume of 04.05.2020 / 06:14 WIB - PVMBG webcam

Semeru - small plume of 04.05.2020 / 06:14 WIB - PVMBG webcam

VAAC Darwin reports an eruption in Semeru, on Java, accompanied by a plume observed 400 meters above the summit on May 3, 2020.

At the seismicity level, Magma Indonesia informs for this May 3:

- 33 eruption earthquakes with an amplitude of 10-21 mm, and the duration of the earthquake 60-102 seconds.

- 2 avalanche earthquakes with an amplitude of 3-6 mm and an earthquake duration of 50-80 seconds. The sliding distance and the direction of fall are not observed.

- 21 blast earthquakes with an amplitude of 2 to 9 mm and an earthquake duration of 40 to 75 seconds.

- A Harmonic earthquake with an amplitude of 4 mm and an earthquake duration of 55 seconds.

- 4 distant tectonic earthquakes with an amplitude of 19-30 mm, S-P 11-21 seconds and an earthquake duration of 30-90 seconds.

The aviation code is orange and the activity level is 2 / waspada.

 

Sources: PVMBG, Magma Indonesia, and VAAC Darwin.

Ruapehu,  Te Wai ā-moe crate lake - photo GNS 04.05.2020

Ruapehu, Te Wai ā-moe crate lake - photo GNS 04.05.2020

An expected cooling trend for the Ruapehu crater lake, Te Wai ā-moe , is now confirmed. The lake reached a maximum temperature of 42 ° C in early April and is currently at 35 ° C.

Today, the intensity of the volcanic tremor is low, as it has been in the past month. After a moderate force peak in early March, the tremor decreased slowly, almost parallel to the cooling trend of the lake. Energy input modeling indicates a weak but continuous heat flow in the lake, indicating that the underlying ventilation area is open to upward flows of volcanic gases and hydrothermal fluids

Last week, GNS volcanologists briefly visited the lake to maintain monitoring equipment. They reported that the lake was a uniform gray color with only a few surface layers and no obvious upwelling. At that time, the water level had dropped to about 30 cm below the overflow, but after the rain this weekend, the lake again overflows into the upper reaches of the Whangaehu River.

The volcanic alert level remains at level 1. There is no change in the aviation color code of green.

 

Source: GNS Science

Mayotte - announcement of future MAYOBS campaigns in May 2020.
Mayotte - announcement of future MAYOBS campaigns in May 2020.

Mayotte - announcement of future MAYOBS campaigns in May 2020.

As part of the actions carried out by the public authorities, to better understand the seismic-volcanic phenomenon which affects Mayotte since May 2018, two new campaigns at sea are organized off the island in early May 2020 by the VOlcanological and SIsmological surveillance network de Mayotte (Revosima) announces the prefecture of Mayotte.

The objectives of these two missions are:

- for MAYOBS13-1 on board the BSAOM Champlain, to recover data from seismic seabed stations and ensure their maintenance

- and for MAYOBS 13-2 on board the ship Gauss de Fugro, to establish new underwater maps to monitor seismic-volcanic activity at the bottom of the sea.

 

Source: Prefecture of Mayotte and IPGP / REVOSIMA

Montserrat - Plymouth Pentecotist church - photo MVO 03.2020

Montserrat - Plymouth Pentecotist church - photo MVO 03.2020

Today at 7:52 p.m. on France Ô Tv: Montserrat, the Pompeii of the Caribbean

 

Montserrat is an English island in the Caribbean. In 1995, its volcano, the Soufriere Hills, erupted for several months and devastated the capital, Plymouth. Since then, the island has been cut in two with, to the south, an area whose access is regulated and a north which is developing to accommodate new housing and administrations. Almost all of the people in the area where the disaster occurred have left the island. The volcano is still active. A team of around twenty scientists constantly monitors it. Almost twenty-five years later, the capital is still covered in ashes. (TV program)

Etna volcano activity time lapse 02-05-2020

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Popocatépetl - 02.05.2020 / 11h04 gas and ash exhalation - WebcamsdeMexico

Popocatépetl - 02.05.2020 / 11h04 gas and ash exhalation - WebcamsdeMexico

Cenapred has identified over the past 24 hours at Popocatépetl 142 exhalations and small explosions, accompanied by gas emissions and small amounts of ash, which continued during the day.

A total of 491 minutes of tremor was recorded.

Night glow marked the summit of the volcano, visible on the webcams from 9 p.m. to more than 10:30 p.m.

The volcanic alert remains at amarillo Fase 2.

 

Sources: Cenapred and webcamsdeMexico.

Popocatépetl - incandescence 02.05.2020 / 21h09 - WebcamsdeMexico

Popocatépetl - incandescence 02.05.2020 / 21h09 - WebcamsdeMexico

In Chile, the Sernageomin reports this May 2, 2020 at 7:33 p.m. local to the Puyehue-Cordon Caulle volcanic complex a volcanotectonic earthquake of M loc. 3.0 / depth 3.1 km, associated with the fragmentation of rocks.

The technical alert remains unclear.

The last period of activity dates back to June 2011 - April 2012, characterized by an VEI 5.

 

Source: Sernageomin / OVDAS & Global Volcanism Program

This series of images includes: a) a location map of Puyehue-Cordón Caulle; b) a NASA ALI image taken on January 26, 2012, including the annotated locations of the observation points (red star) and the red box corresponds to the area in "c"; c) the overlapping ventilation structures and ash plumes were captured on this GeoEye-1 image from July 3, 2012; (d) and this panorama of the active lava flow observed on January 10, 2012 (note that the scale is approximate). The original images are from Schipper et al., 2013. / GVP

This series of images includes: a) a location map of Puyehue-Cordón Caulle; b) a NASA ALI image taken on January 26, 2012, including the annotated locations of the observation points (red star) and the red box corresponds to the area in "c"; c) the overlapping ventilation structures and ash plumes were captured on this GeoEye-1 image from July 3, 2012; (d) and this panorama of the active lava flow observed on January 10, 2012 (note that the scale is approximate). The original images are from Schipper et al., 2013. / GVP

In Shishaldin, on advisory volcanic alert and Yellow aviation code, the troubles continue with possible sulfur dioxide emissions detected by satellite and vapor in the crater visible on high resolution satellite images. The views of the web cameras were obscured by the clouds and no significant activity was detected on local seismic stations or regional infrared sensors. Although disturbances are currently at low levels, activity could intensify with little warning, and additional eruptive activity in the summit crater, lava flows, lahars and ash-producing eruptive events could happen.

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

 

Sources: AVO / 02.05.2020 and Pierre Markuse.

Shishaldin - Sentinel-2 enh image. Nat. Colors + IR overlay / 04.29.2020 - via Pierre Markuse - one click to enlarge

Shishaldin - Sentinel-2 enh image. Nat. Colors + IR overlay / 04.29.2020 - via Pierre Markuse - one click to enlarge

An earthquake with a magnitude of 6.7 and a depth of 10 km. was located by the INGV Tsunami Warning Center (CAT) and EMSC at 12.51 UTC on May 2, 2020. The epicenter is located at sea, about 80 km south of the island of Crete.

The pushing mechanism suggests a break on the subduction interface at shallow depth.

Due to the magnitude, a red tsunami alert (Watch) was issued by the CAT-INGV for the island of Crete, while the alert level is orange (Advisory) for the other regions of Greece, for Turkey, Libya and Egypt. The warning message was issued by CAT-INGV eight minutes after the earthquake.

The CAT-INGV issued a confirmation message of the tsunami, which was observed at the tide gauge of Ierapetra on the island of Crete, although with a extent hitherto limited (approximately 15 cm, or approximately 35 cm at peak). Technically speaking, a sea level change caused by an earthquake has occurred, so it is indeed a tsunami, although small, it caused whirlpool and currents in ports and on beaches.

 

A strong aftershock occurred at 13:33 UTC, characterized by an M 5.3 and a depth of 30 km.

 

Sources: EMSC & CAT-INGV

South Crete - earthquakes of 02.05.2020 / 12.51 and 13.33 UTC - Doc. EMSC
South Crete - earthquakes of 02.05.2020 / 12.51 and 13.33 UTC - Doc. EMSC

South Crete - earthquakes of 02.05.2020 / 12.51 and 13.33 UTC - Doc. EMSC

Earthquake of 02.05.2020 south of crete - location and sea level at Ierapetra (tsunami) - Doc. Dr. Heidarzadeh / Brunel Univ. London

Earthquake of 02.05.2020 south of crete - location and sea level at Ierapetra (tsunami) - Doc. Dr. Heidarzadeh / Brunel Univ. London

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Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image nat colors / bands 4,3,2 - one click to enlarge

Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image nat colors / bands 4,3,2 - one click to enlarge

In the Kurils, the activity of the Ebeko continues, with the observation this May 1 of a plume of gas and ash at 2,600 meters asl, drifting towards the north of the volcano over 5 km.

This activity and the easterly winds have drawn a large triangle of ash on the snow covering the region; the city of Severo-Kurilsk is affected by these deposits.

The aviation code remains orange.

 

Sources: KVERT, VAAC Tokyo and Sentinel-2

 Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image nat colors / bands 4,3,2 - one click to enlarge

 Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image nat colors / bands 4,3,2 - one click to enlarge

 Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image IR / bands 8,4,3 - one click to enlarge

 Ebeko - ash on Severo-Kurilsk this 30.04.2020 - Sentinel-2 L1C image IR / bands 8,4,3 - one click to enlarge

In Costa Rica, hydrothermal eruptions continue at Rincon de La Vieja.

The Ovsicori detected an episode on April 29 at 9:19 p.m., without visual observation; the observatory signals the presence of a continuous tremor since 8 am in the morning.

This April 30, another episode occurred from 4:10 pm local, accompanied by an eruptive column which rose to 1,500 meters above the crater.

Video on Facebook: https://www.facebook.com/OVSICORI/videos/678953862867989/

Source: Ovsicori

Irazu - drying up of the crater lake and traces of landslide from last year in April 2020 - photos RSN- CNE

Irazu - drying up of the crater lake and traces of landslide from last year in April 2020 - photos RSN- CNE

Also in Costa Rica, visual and drone observations obtained by RSN and CNE staff from the Irazu crater lake in the central Cordillera show a completely dry lake, and the landslide that has happened one year ago.

The drop in water level started in 2019 can be mainly attributed to water infiltration processes by fractures, evaporation being less intense than at Poas.

 

Sources: Red Sismologica Nacional and CNE - photos by Blas Sanchez (CNE), Jason Navarro and Paulo ruiz (RSN).

Irazu - evolution of the level of the crater lake between May 4 and November 3, 2019 - photos RSN - CNE

Irazu - evolution of the level of the crater lake between May 4 and November 3, 2019 - photos RSN - CNE

The VAAC Darwin reports this May 1 at 4:15 am Z an eruption in Bagana volcano , Papua New Guinea; the ashes are reported at flight height 100 westbound. The models used on the basis of Himawari-8 satellite images allow extrapolation of ash dissipation (within 6 hours).

 

Source: VAAC Darwin

 Bagana  - activity on 27.04.2020 - Sentinel-2 L1C image nat colors bands 4,3,2

Bagana - activity on 27.04.2020 - Sentinel-2 L1C image nat colors bands 4,3,2

Bagana - Volcanic Ash Advisory 01.05.2020 - Doc. VAAC Darwin IDY65280

Bagana - Volcanic Ash Advisory 01.05.2020 - Doc. VAAC Darwin IDY65280

Bagana - photo archives - credit: EQC-YOUTUBE-081019-1120

Bagana - photo archives - credit: EQC-YOUTUBE-081019-1120

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Hot spot(s) at the Iodake crater of Satsuma Iwo Jima from 16.04.2020 - Sentinel-2 L1C image from 16.04.2020 bands 12,11,4 - one click to enlarge

Hot spot(s) at the Iodake crater of Satsuma Iwo Jima from 16.04.2020 - Sentinel-2 L1C image from 16.04.2020 bands 12,11,4 - one click to enlarge

Geological map of Satsuma Iwo Jima - Doc. Geological Survey of Japan / GVP

Geological map of Satsuma Iwo Jima - Doc. Geological Survey of Japan / GVP

An eruption occurred at 6:09 am on April 29 at the Iodake crater of Satsuma Iō-jima (30 ° 47 ′ 27 ″ N, 130 ° 17 ′ 46 ″ E). It continued until 6:50 a.m. The height of the gas and ash plume is 1000 meters above the edge of the crater. The ashes should fall to the north of the crater.

The last eruption occurred on Satsuma Iō-jima in November 2019.

The inclinometer data near Mount Iodake did not show any significant change due to volcanic activity.

Therefore, it is unlikely that a large-scale eruption will occur at this time.

Currently, Satsuma Iō-jima is at eruption alert level 2 (regulation around the crater).

Satsuma Iwo Jima - photo archive GVP / JMA 03.22.2019

Satsuma Iwo Jima - photo archive GVP / JMA 03.22.2019

The Kikai caldera (red dotted outline) and the 2 islands located on its northern edge, Satsuma Iwo Jima and Take-shima - Courtesy of the Geological Survey of Japan / GVP

The Kikai caldera (red dotted outline) and the 2 islands located on its northern edge, Satsuma Iwo Jima and Take-shima - Courtesy of the Geological Survey of Japan / GVP

Kikai is a 19 km wide submerged caldera located near the northern tip of the Ryukyu Islands, south of Kyushu. It was the source of one of the largest Holocene eruptions in the world around 6,300 years ago, when pyroclastic rhyolitic flows crossed the sea for a total distance of 100 km to the south of Kyushu , and ash falls reached the island of Hokkaido, in the north of Japan.

Post-caldera eruptions formed the Iodake lava dome and the Inamuradake slag cone, as well as underwater lava domes. Historical eruptions have occurred at or near Satsuma-Iojima (also known as Tokara-Iojima), a small 3 x 6 km island that forms part of the northwest edge of the caldera.

 

Sources:

- JMA / Satsuma Iwo Jima - Explanatory information 07:30 am, April 29, Reiwa 2 Fukuoka District Weather Observatory / Kagoshima Local Weather Observatory

- Global Volcanism Program - Kikai - link

Ebeko - Ash plume of 04.28.2020 - photo Kotenko Leonid / IVS FEB RAS KVERT

Ebeko - Ash plume of 04.28.2020 - photo Kotenko Leonid / IVS FEB RAS KVERT

A moderate eruptive activity continues at Ebeko volcano, in the Kuril Islands.

On April 28, a stronger explosion occurred, observed from Severo-Kurilsk by Leonid Kotenko from the local volcanic observatory. This Vulcanian explosion produced a plume of ash rising 2,000 meters above the volcano, then drifting to the southeast. VAAC Tokyo has estimated the height of the plume at 3,600 meters asl., corresponding.

On April 30, the KVERT reports an explosion accompanied by an ash plume at 2,000 meters asl. , drifting east from the volcano.

Aviation code remains orange, with the continuation of this activity which may affect low-level flights and Severo-Kurilsk airport

 

Sources: KVERT & VAAC Tokyo
 

Popocatépetl - the exhalation of 04.29.2020 at 07.46 am, with its gray plume which contrasts with the white of the snowy summit - webcamsdeMexico

Popocatépetl - the exhalation of 04.29.2020 at 07.46 am, with its gray plume which contrasts with the white of the snowy summit - webcamsdeMexico

In the past 24 hours, using the Popocatépetl volcano monitoring system, 52 exhalations have been identified, accompanied by water vapor, gas and slight amounts of ash dispersed towards the southeast sector (SE) .

Similarly, 908 minutes of tremor of low and medium amplitude were recorded.

At the time of this report, there is a partial visibility, however in the morning a constant emission was observed in the southeast direction.

 

Cenapred urges NOT to get close to the volcano and especially the crater, because of the danger involved in the fall of ballistic fragments and, in the event of heavy rain, to move away from the bottom of the ravines because of the danger of mud and rubble.

The Popocatépetl volcanic alert remains at Amarillo Fase 2.

 

Sources: Cenapred and webcams from Mexico

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 Pacaya - lava flow of 04.27.2020 - Lansat image 8 bands 7,6,2 - Doc. Insivumeh / USGS

Pacaya - lava flow of 04.27.2020 - Lansat image 8 bands 7,6,2 - Doc. Insivumeh / USGS

 Pacaya - lava flow, 250 meters long, on April 27, 2020 - image Lansat 8 bands 7,6,2 - Doc. Insivumeh / USGS

Pacaya - lava flow, 250 meters long, on April 27, 2020 - image Lansat 8 bands 7,6,2 - Doc. Insivumeh / USGS

In Guatemala, the Pacaya has shown significant seismicity since April 27 during the night, recorded by the PCG and PCG 5 stations. It was caused by the opening of a crack on the northeast flank of the volcano , according to Insivumeh; it emanates only gases.

A lava flow extends to the southwest, and has extended for 400 meters from the MacKenney crater. Simultaneously, Strombolian explosions are accompanied by incandescent ejections a hundred meters high.

The ban on climbing for guides and tourists is recalled by the Government of Guatemala.

 

Source: Insivumeh & the Government of Guatemala.

Pacaya - thermal anomalies on 04.28.2020 / 7:35 p.m. - Mirova_MODIS_VRP

Pacaya - thermal anomalies on 04.28.2020 / 7:35 p.m. - Mirova_MODIS_VRP

Pacaya - lava flow on 04.28.2020 with FLIR camera - doc. Insivumeh

Pacaya - lava flow on 04.28.2020 with FLIR camera - doc. Insivumeh

On April 27, a new hydrothermal eruptive episode marked the Rincon de La Vieja at 5:20 pm. It is characterized by a duration of 5 minutes and a plume reaching 1,000 meters above the crater.

New episode on April 28 at 9:19 p.m. local, lasting 1 minute, unable to determine the height of the plume, due to lack of visibility

 

Source: Ovsicori

 Rincon de La Vieja Crater - photo © Bernhard Edmaier, via “Bilder von der Erde” [Images of the Earth]

Rincon de La Vieja Crater - photo © Bernhard Edmaier, via “Bilder von der Erde” [Images of the Earth]

The activity continues at the Shindake crater of Kuchinoerabujima, with an eruption that occurred at 11:05 a.m. on April 29, characterized by a plume of ash and gas 1,000 meters above the crater. The plume flows north, then northeast.

 

Sources: NHK and JMA

Kuchinoerabujima - 04.29.2020 / 11.30 a.m. local - via NHK

Kuchinoerabujima - 04.29.2020 / 11.30 a.m. local - via NHK

2020.04.29  11h30  locale Kuchinoerabujima  - Doc. JMA

2020.04.29 11h30 locale Kuchinoerabujima - Doc. JMA

The Steamboat Geyser, in the Norris basin at Yellowstone N.P., erupted in water on April 27 from 4:29 p.m. to 4:39 p.m. It is the third eruption for the month of April 2020 and the twelfth manifestation in the course of this beginning of the year.

It seems that this geyser is in a phase of more frequent watery eruptions, as it had in the 60s and early 80s. But this time, because of the Covid-19, its activity did not have spectators.

These eruptions have no implications for future volcanic activity at Yellowstone, but are part of normal geyser activity, even if it is erratic.

 

Source: Geysertimes, org - link

Steamboat Geyser / Norris geyser basin - photo archive JAMES ST. JOHN via attribution 2.0 generic (CC BY 2.0)

Steamboat Geyser / Norris geyser basin - photo archive JAMES ST. JOHN via attribution 2.0 generic (CC BY 2.0)

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Publié dans : #volcanic activity
 Sakurajima - explosion of  04.27.2020 / 10:47 p.m. - JMA webcam

Sakurajima - explosion of  04.27.2020 / 10:47 p.m. - JMA webcam

At Sakurajima, at the summit crater of Minamidake, nine eruptions occurred, including two explosions, according to the JMA on April 27. The plume rose up to 2500m above the edge of the crater before dispersing east.

The largest volcanic blocks reach the 6th station (800 to 1100 m from the Minamidake summit crater).

Inclinometers and extensometers installed on the island show the uplift and the expansion of the volcano.

 

Source: JMA / Fukuoka District Weather Observatory, Kagoshima Local Weather Observatory / info # 35.

Suwanosjima - 28.04.2020 / 04h16 - JMA webcam

Suwanosjima - 28.04.2020 / 04h16 - JMA webcam

In Suwanosjima, in the Ryukyu arc, an eruptive episode is reported on April 28 at 4:17 am; it was accompanied by a plume at 1,400 meters above the crater, with a flow towards the south-east.

The activity is in progress, and the alert levels unchanged.

 

Source: JMA

Sabancaya - summary of the activity between 20 and 26 April 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 20 and 26 April 2020 - Doc. I.G.Peru

The Peruvian Geophysical Institute (IGP) reports that the eruptive activity of the Sabancaya volcano remains at moderate levels; that is to say with the continuous record of explosions with columns up to 2 km high above the summit of the volcano and the consequent emission of ash and gas. Consequently, for the following days, no significant change is expected regarding its activity.

Between 20 and 26 April 2020, the IGP recorded and analyzed the occurrence of around 297 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) inside the volcano.

On average, 9 daily explosions of low to medium intensity were recorded. Plumes of gas and ash up to 2 km high above the summit of the volcano could be observed, scattered towards the southwest, south and southeast sectors of the Sabancaya.

Between April 21 and 25, major earthquakes were recorded in the Colca Valley region, with magnitudes between M3.2 and M4.1, associated with tectonic and volcanic activity; The epicenters of these earthquakes are located within a radius of 20 km around the crater of the volcano.

The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), does not present any significant anomalies; However, the presence of slight inflation in the area of ​​the northern Sabancaya volcano (near the Hualca Hualca volcano) has been observed.

Satellite surveillance has enabled the presence of 8 thermal anomalies with values ​​between 3 MW and 15 MW, associated with the presence of a body of lava (dome) on the surface of the crater of the volcano.

The volcanic alert level remains orange, with an exclusion zone of 12 km radius around the crater.

 

Source: I.G. Peru & Cenvul

 Anak Krakatau - 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

 Anak Krakatau - 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

The Anak Krakatau, on alert 2 / waspada, presented thermal anomalies between medium and low on April 26; visible on April 27 on a Sentinel-2 satellite image, it was not signaled by Mirova, due to cloud cover.

The PVMBG signals at the seismicity level for April 27 :

- 13 blast earthquakes, with an amplitude of 3-20 mm, and an earthquake duration of 6-28 seconds.

- 37 low frequency earthquakes with an amplitude of 2 to 9 mm and an earthquake duration of 3 to 10 seconds.

- 4 hybrid earthquakes with an amplitude of 7 to 9 mm, the S-P was not observed and the earthquake and for 5 to 10 seconds.

- 4 shallow volcanic earthquakes, with an amplitude of 2 to 6 mm, for 4 to 8 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5 to 6 mm, dominating 1 mm.

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

 

Sources: PVMBG, Magma Indonesia, Mirove and Sentinel-2

Stromboli - hot spots on the terrace and bluish plume of gas on 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Stromboli - hot spots on the terrace and bluish plume of gas on 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Bonus: a beautiful bluish plume of gas at Stromboli on 04.27.2020

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