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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

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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