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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
Sheveluch - image Sentinel-2 nat. colors from 28.04.2019 - one click to enlarge

Sheveluch - image Sentinel-2 nat. colors from 28.04.2019 - one click to enlarge

At Sheveluch, in the Kamchatka peninsula, the explosive-extrusive eruption continues.

On April 27, the KVERT reports an ash plume at 4,400 meters asl., drifting southeast over a hundred km.

On April 28, a Sentinel 2 image, taken during clearings, allows to see the hot spots of the summit area and the flows.

The aviation code remains orange, ash explosions can occur at any time.

 

Sources: KVERT & Sentinel 2

Sheveluch - thermal anomalies on 28.04.2019 / 10h55 - Doc. Mirova_MODIS_Latest10NTI

Sheveluch - thermal anomalies on 28.04.2019 / 10h55 - Doc. Mirova_MODIS_Latest10NTI

Sheveluch - hot spots on 28.04.2019 - Sentinel image 2 bands 12,11,4 - one click to enlarge

Sheveluch - hot spots on 28.04.2019 - Sentinel image 2 bands 12,11,4 - one click to enlarge

In Costa Rica, three volcanoes are on alert level 3 / eruption, steady state: Rincon de la Vieja, Turrialba and Poas.

In Poas, inacandescence is observed in the early hours of April 28th; during the morning, a white degassing (majority of steam) continues.

 

Source: Ovsicori

Warning level of Costa Rica volcanoes in 2019 - Ovsicori table
Warning level of Costa Rica volcanoes in 2019 - Ovsicori table

Warning level of Costa Rica volcanoes in 2019 - Ovsicori table

Poas - 28.04.2019 / night glow at 02:39 and degassing at 05:56 - webcam Ovsicori
Poas - 28.04.2019 / night glow at 02:39 and degassing at 05:56 - webcam Ovsicori

Poas - 28.04.2019 / night glow at 02:39 and degassing at 05:56 - webcam Ovsicori

At Merapi, Java, the BPPTKG reports a pyroclastic flow on April 28 at 10:00, for more than two minutes, not observed directly because of the haze.

Seven blast earthquakes and 44 earthquakes of collapses are reported at the PVMBG for the same day.

The activity level remains at 2 / waspada, with a prohibited area of ​​3 km radius.

 

Sources: BPPTKG, Magma Indonesia & PVMBG

 Merapi - seismogram of 28.04.2019 - Doc. Magma Indonesia

Merapi - seismogram of 28.04.2019 - Doc. Magma Indonesia

Merapi - summary of the activity of 28.04.2019 / 00-24h WIB - Doc. BPPTKG

Merapi - summary of the activity of 28.04.2019 / 00-24h WIB - Doc. BPPTKG

Some quieter news:

In New Zealand, the period of high temperature that marked the Te Wai crater lake of Ruapehu, as well as the associated volcanic tremor, has passed. During the past week, small plumes of steam have been observed; we can expect a gradual cooling as winter approaches.

The volcanic alert is at level 1, minor instability ... an eruption is likely to occur without or with little warning.

 

Source: GeoNet

Ruapehu - fumaroles on the Te Wai at-moe - picture GeoNet 29.04.2019

Ruapehu - fumaroles on the Te Wai at-moe - picture GeoNet 29.04.2019

In Japan, Sakurajima remains calm for the moment.

Some photos of my friend Pierre Gondolff, on the spot, attest of the situation.

The Sakurajima remains on alert level 2 / do not approach the volcano, established on February 5, 2016 by the JMA

 

Sources: PierreGondolff, whom I thank for sharing photos, and JMA

Sakurajima - Relative calm on 26 and 27.04.2019 - photos © Pierre Gondolff
Sakurajima - Relative calm on 26 and 27.04.2019 - photos © Pierre Gondolff

Sakurajima - Relative calm on 26 and 27.04.2019 - photos © Pierre Gondolff

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