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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, #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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