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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
 Etna by Zafferana Etnea - photo Boris Behncke 22.05.2020 / around 10am

 Etna by Zafferana Etnea - photo Boris Behncke 22.05.2020 / around 10am

The INGV Osservatorio Etneo, reports that from 02:12 UTC, strombolian activity increased in the saddle cone of the new crater of south-eastern of Etna. Explosive activity produces a cloud of volcanic ash reaching 4,500 m (above sea level) dispersed by the wind to the southwest. The VONA went red at 07:12 hours, before finding the Orange level at 13:16 hours.

Explosive activity also continues at the Voragine crater with periodic emissions of ash, which disperse rapidly near the summit area.

The magnitude of the volcanic tremor, compared to yesterday, has undergone a moderate increase, with large fluctuations around medium and high values. Currently, the amplitude values ​​are high and the source of the tremor continues to be located near the New SE crater. The infrasonic activity has shown a moderate increase and the sources are mainly located in the New SE crater.
The soil deformations do not show significant variations.

 

Source: INGVvulcani

Etna - 22.05.2020, respectively at 05.58 and 08.58 - LAVE webcam - one click to enlarge
Etna - 22.05.2020, respectively at 05.58 and 08.58 - LAVE webcam - one click to enlarge

Etna - 22.05.2020, respectively at 05.58 and 08.58 - LAVE webcam - one click to enlarge

Etna - amplitude of the tremor at 22.05.2020 / 08.10 am - Doc. INGV OE ECPN velocimeter

Etna - amplitude of the tremor at 22.05.2020 / 08.10 am - Doc. INGV OE ECPN velocimeter

An overview of Nishinoshima, in the Ogasawara Islands in southern Japan, was conducted by the Japan Coast Guards on May 18, 2020.

When approaching the island, the summit activity was coupled with degassing due to the arrival of lava at sea.

Nishinoshima - overview of 18.05.2020 / 13.52 - Doc. Japan Coast Guards

Nishinoshima - overview of 18.05.2020 / 13.52 - Doc. Japan Coast Guards

Strombolian explosions produce a plume of ash, and eject materials on the blanks of the pyroclastic cone. We can follow the progress of the lava towards the coast, thanks to the degassing of the flow.

On the thermal image, we can see that the lava flowing from the effusive vent on the southwest flank of the cone is divided into two arms, one of which forms a delta at the entrance to the sea.

Activity appears to be continuous, slightly up on April 29, 2020 overview

 

Source: Japan Coast Guards

Nishinoshima - overview of 18.05.2020 / 2:04 p.m. - Doc. Japan Coast Guards

Nishinoshima - overview of 18.05.2020 / 2:04 p.m. - Doc. Japan Coast Guards

Nishinoshima - overview of 18.05.2020 / 14h06 - thermal camera image - Doc. Japan Coast Guards

Nishinoshima - overview of 18.05.2020 / 14h06 - thermal camera image - Doc. Japan Coast Guards

In Costa Rica, the level of the laguna caliente du Poas rose following the rains and gave it a beautiful hue. The main mouths of the crater degas continuously.

The CO2 / SO2 and H2S / SO2 gas ratios remain in stable ranges. At the multigas station, the maximum concentration of SO2 reached 4.75 ppm, while at the watchtower, the maximum concentration reached more than 5 ppm on May 22 in the morning.

A tremor of 1 to 10 Hz is recorded.

Poas - 05.22.2020, respectively at 5:14 am and 6:38 am; and the Poas plume at 8:17 am, seen from the Irazu- webcam Ovsicori - one click to enlarge
Poas - 05.22.2020, respectively at 5:14 am and 6:38 am; and the Poas plume at 8:17 am, seen from the Irazu- webcam Ovsicori - one click to enlargePoas - 05.22.2020, respectively at 5:14 am and 6:38 am; and the Poas plume at 8:17 am, seen from the Irazu- webcam Ovsicori - one click to enlarge

Poas - 05.22.2020, respectively at 5:14 am and 6:38 am; and the Poas plume at 8:17 am, seen from the Irazu- webcam Ovsicori - one click to enlarge

An overview of the Rincon de La Vieja was also carried out on May 22, with the observation of a significant white of gas and vapor degassing in the active crater. A continuous tremor, between 0.6 and 5 Hz, is reported.

In addition, at 4:24 p.m. local time, a 1-minute eruption was accompanied by a plume that reached 1,000 meters above the crater. It followed a vapor emission.

 

Sources: Ovsicori & R.S.N.

Rincon de La Vieja - overview of 05.22.2020 - Ovsicori video screenshot

Rincon de La Vieja - overview of 05.22.2020 - Ovsicori video screenshot

Rincon de La Vieja - steam emission on 05.22.202 / 4:50 p.m. - Doc. Ovsicori

Rincon de La Vieja - steam emission on 05.22.202 / 4:50 p.m. - Doc. Ovsicori

An explosion occurred at the Nevados de Chillan Complex on May 22, 2020 at 11:36 am local time, associated with an LP seismic signal, in connection with the dynamics of internal fluids; the gas and ash plume rose to 2,200 meters above the emission bridge, before dispersing to the northeast.

The technical alert remains in Amarilla.

 

Source: Sernageomin

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