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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

This June 29, at 2:22 p.m. local time, Insivumeh recorded a pyroclastic flow on the western flank of the Caliente dome of the Santa Maria-Santiaguito complex.

It finds its origin in the overflow of materials which have accumulated in the dome of the dome, causing the descent of a mixture of blocks of rocks, ashes and gases forming a cloud which reached the base of the dome, without extending to cultivated / inhabited areas.

This event follows a precedent on June 19 at 5:35 am local time, which shows that the explosive activity, accompanied by avalanches of boulders on the flanks of the Caliente, has increased and is likely to last in the coming days or weeks.

 

Source: Insivumeh

Santiaguito - pyroclastic flow from June 29 / 2:22 p.m. loc. - Doc Insivumeh

Santiaguito - pyroclastic flow from June 29 / 2:22 p.m. loc. - Doc Insivumeh

At 08:18:00 local time on June 29, 2020, an eruption is recorded in the Turrialba volcano, with a column that rises 100 meters above the height of the crater and 3440 meters above the level of the sea. (11,283.2 ft). Duration of activity: less than a minute.

Seismic activity is similar to that of yesterday.

At the time of this Ovsicori report, the winds were blowing west. During the past 24 hours and when the weather was favorable, several ash eruptions were observed (local hours: 13:48, 17:39 23:03 1:07 2:32 03:06 4:12 8:18) . The plume of these eruptions did not exceed 100 m above the level of the crater. At least 2 of these eruptions were accompanied by ballistics projected on the north wall of the active crater (at 1h07 and 4h12). A subsidence of the volcanic massif is observed, as well as gas ratios in the values ​​of the last days.

 

Source: Ovsicori

  Turrilana - the plume, 5 minutes after the eruptive episode of 06.29.2020 - Ovsicori webcam 06.29.2020 / 8:25 a.m.

Turrilana - the plume, 5 minutes after the eruptive episode of 06.29.2020 - Ovsicori webcam 06.29.2020 / 8:25 a.m.

According to the images of Sentinel-2 and the Mirova site, a small activity is maintained sporadically on Kadovar, in Papua New Guinea.

A double hot spot is visible at the top of the volcano island, with a low thermal anomaly.

The explosions seem small, and sporadic, if we judge by the succession of small balc clouds in the wake of bluish gases.

 

Mirova also detects a thermal anomaly on Manam, without confirmation available from Sentinel.

 

Sources: Sentinel-2 and Mirova

 Kadovar - Sentinel-2 L2A bands 12,11,4  images from 06.28.2020 - one click to enlarge
 Kadovar - Sentinel-2 L2A bands 12,11,4  images from 06.28.2020 - one click to enlarge

Kadovar - Sentinel-2 L2A bands 12,11,4 images from 06.28.2020 - one click to enlarge

Tropomi detected a strong signal of sulfur dioxide - 23.78 DU of SO2 at an altitude of 8.05 km - near Medvezhia on June 29, 2020. It seems that this cloud of sulfur dioxide originates from Nishinoshima

... but this is an opportunity to talk about this volcanic complex of Medvezhia (also known as Moyorodake) which occupies the northeast end of the island of Iturup (Etorofu) in the Kurils.

Two overlapping calderas, 14 x 18 and 10 x 12 km in diameter, formed during the Pleistocene. The caldera floor contains several lava domes, ash cones and associated lava fields, and a small lake. Four small closely spaced stratovolcanoes were constructed along an E-W line on the east side of the complex. The easternmost and highest, Medvezhia, is found outside the western caldera, along the Pacific coast. The Srednii, Tukap and Kudriavy (Moyorodake) volcanoes are immediately to the west. Moyorodake, historically active, and Tukap remain fumarolically active. The westernmost post-caldera cone, Menshoi Brat, is a large lava dome with flank slag cones, one of which produced a series of young lava flows up to 4.5 km from long that reached Slavnoe Lake. Eruptions have been documented since the 18th century, although lava flows from ash cones on the flanks of Menshoi Brat have also likely erupted in recent centuries.

Its last phreatic-type eruption dates from October 1999.

 

Sources:

- Sentinel-5P / Tropomi

- Global Volcanism Program - Moyorodake [Medvezhia]

 Medvezhia - strong SO2 signal on 29.06.2020 in the vicinity of Medvezhia - Doc. Sentinel-5P / Tropomi / via DLR-BIRA-ESA

Medvezhia - strong SO2 signal on 29.06.2020 in the vicinity of Medvezhia - Doc. Sentinel-5P / Tropomi / via DLR-BIRA-ESA

 Medvezhia - northern part of the Kudriavy crater - photo GVP 1999

Medvezhia - northern part of the Kudriavy crater - photo GVP 1999

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