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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
 Shishaldin - Spattering and lava lake in the crater - photo by David Fee 23.07.2019 / UAFGI - AVO

 Shishaldin - Spattering and lava lake in the crater - photo by David Fee 23.07.2019 / UAFGI - AVO

The Alaska Volcano Observatory (AVO) raised the color of the air alert to Orange and the level of volcanic alert at Watch at Shishaldin.

Scientists report the deep presence of an active lava lake and spattering within the summit crater observed during a helicopter flight. This activity corroborates the seismic activity and the high surface temperatures measured by satellite (thermal anomalies of VRP 4 and 5 MW on July 23 and 24). Activity remains limited inside the crater.

 

Source: AVO & Mirova

Ubinas - seismicity of 24.07.02019 (LP and hybrid earthquakes) - Doc. INGEMMET

Ubinas - seismicity of 24.07.02019 (LP and hybrid earthquakes) - Doc. INGEMMET

At Ubinas, the IGP reports a total of 1,522 seismic events between July 20th and 24th, all of a magnitude below 2.2.

During the analyzed period, an increase in seismic signals in relation to the rise of the magma (LP & hybrids) causes fear of explosive activity in terms of hours or days; it should be noted that more than 35 hours have passed since the last explosion. Thermic anomalies remain moderate to low, between 11 and 6 MW

 

Source: IGP - activity report of 24.07.2019, Ingemmet and Mirova

Tangkuban Parahu / java - photo piknikasik

Tangkuban Parahu / java - photo piknikasik

The PVMBG reports an increase in seismicity of Tangkuban Parahu / Java since July 22, 2019. More than 425 earthquakes were counted, including two harmonic tremor episodes, 3 volcanic earthquakes and 3 low frequency earthquakes.

Changes in groundwater level are suspected to be related to this seismic activity.

It is recommended not to approach the Queen's and Upas craters due to the presence of harmful volcanic gases, and the possibility of sudden phreatic eruptions.

 

Source: PVMBG 24.07.2019

Sakurajima - 24.07.2019 / 15-21h - Doc. JMA
Sakurajima - 24.07.2019 / 15-21h - Doc. JMA

Sakurajima - 24.07.2019 / 15-21h - Doc. JMA

The explosive activity continues at Sakurajima / Minami-dake crater, without much change in the parameters, and with ash evacuation to the east.

Magma storage in the lower part of Kagoshima Bay is responsible for inflation as measured by GNSS observation.

 

Source: JMA

Nevados of Chillan - incandescence and emission of gas the 25.07.2019 / 5h33 - webcam Sernageomin

Nevados of Chillan - incandescence and emission of gas the 25.07.2019 / 5h33 - webcam Sernageomin

In Chile, the "contructive-destructive activity" of the Nicanor crater dome of the Nevados de Chillan complex continues cyclically, marked by LP earthquakes and tremor episodes.

This morning July 25, 2019 from 5:33, the webcam show incandescence at the top and gas emissions.

The volcanic alert remains in Naranja

 

Source: Sernageomin

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