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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
Pacaya - lava flow and avalanche of blocks at the start of the flow front - sentinel image2 bands 12,11,5 dated 13.07.2020 - Doc. Insivumeh

Pacaya - lava flow and avalanche of blocks at the start of the flow front - sentinel image2 bands 12,11,5 dated 13.07.2020 - Doc. Insivumeh

The activity continues at Pacaya, according to the pattern observed in recent days.

During the night and at the start of the day, the Strombolian explosions eject materials between 50 and 100 meters high.

A lava flow is observed over 25 meters to the northwest, and block avalanches reach an additional 150 meters from the flow front.

 

Fuego - avalanche of blocks in the direction of the Ceniza barranca - Sentinel image 2 bands 12,11,5 dated 13.07.2020 - Doc. Insivumeh

Fuego - avalanche of blocks in the direction of the Ceniza barranca - Sentinel image 2 bands 12,11,5 dated 13.07.2020 - Doc. Insivumeh

At Fuego, explosions follow one another at the rate of 6-9 per hour, accompanied by columns of gas and ash at 4400-4700 meters asl. dispersing west.

Ash falls are reported in the areas of Panimache II, Sangre de Cristo, Finca Palo Verde and El Porvenir.

Night glow is reported, 150 to 300 meters high, accompanied by avalanches of boulders towards the Trinidad, Tanilyua, Ceniza honda, Las Lajas and Seca barrancas; some blocks roll to the limits of vegetation.

 

Source: Insivumeh

Sabancaya - summary of the activity between 6 and 12 July 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 6 and 12 July 2020 - Doc. I.G.Peru

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano during the week of July 6 to 12 remained at moderate levels, with the recording of an average of 17 daily explosions, with formation ash and gas columns up to 2.5 km high above the top of the volcano. Consequently, for the following days, no significant change is expected regarding his eruptive activity.

The IGP recorded and analyzed the occurrence of approximately 596 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) inside the Sabancaya volcano. Deformation monitoring, using GNSS data (processed with fast orbits), does not present any significant anomalies; however, slight inflation was recorded in the north and southeast sector of Sabancaya. Satellite surveillance identified the presence of 6 thermal anomalies with values ​​between 4MW and 10MW, associated with the presence of a body of lava on the surface of the crater of the volcano.

On July 8, an ash scattering alert was issued by the Volcanes Perú mobile application for the districts of Lari, Maca, Achoma, Ichupampa, Yanque, Chivay, Coporaquey Tuti, intended for the authorities and residents of the above-mentioned districts.

The alert level remains at Naranja, with a 12 km radius prohibited area.

 

Source: I.G. Peru

Nishinoshima - SAR intensity images of July 10, 2020 (left) and July 3, 2020 (right) - Doc. GSI (The incident direction of radio waves being different, the appearance of the topography in the image may differ.)

Nishinoshima - SAR intensity images of July 10, 2020 (left) and July 3, 2020 (right) - Doc. GSI (The incident direction of radio waves being different, the appearance of the topography in the image may differ.)

At Nishinoshima, the comparison of the SAR intensity images of July 3 and 10, reveals topographic changes due to lava on the southwest side of the pyroclastic cone, with modification of the coastline.

The diameter of the pyroclastic cone has increased by a factor of 1.1.

In a large area north of the pyroclastic cone, there is a decrease in the intensity of reflection ( * ), which would be due to the fall of the ashes.
(*: The image becomes dark in the area with low reflection intensity.)

 

The Sentinel-5P / Tropomi satellite recorded a strong sulfur dioxide signal on July 14, with 17.94 DU of SO2 at an altitude of 8.47 km.
 

Source: GSI & Tropomi

Nishinoshima - 14.07.2020 - strong SO2 signal around Nishinoshima, with 17.94DU of SO2 at an altitude of 8.47km. - Tropomi / DLR / BIRA / ESA

Nishinoshima - 14.07.2020 - strong SO2 signal around Nishinoshima, with 17.94DU of SO2 at an altitude of 8.47km. - Tropomi / DLR / BIRA / ESA

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