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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
 Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo.Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo. Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo.Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo.

Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo.Miyakejima: the caldera formed in 2000 / photo JMA 2002 - and location SW of Tokyo.

This June 24, 2020, Sentinel-5P / Tropomi detected a strong signal of sulfur dioxide (31.21 DU of SO2) near Miyakejima in the volcanic arc Izu.

The alert level is currently at 1 / potential for an increase in activity.

 

The 8 km wide circular island of Miyakejima forms a narrow angle stratovolcano that rises about 1100 m from the seabed in the north of the Izu Islands about 200 km southwest of Tokyo. The basalt volcano is truncated by small summit calderas, one of which, 3.5 km wide, formed during a major eruption about 2,500 years ago. Craters and parasitic vents, including maars near the coast and radially oriented crack vents, dot the sides of the volcano.

Frequent historical eruptions have occurred since 1085 CE at vents going from the summit below sea level, causing much damage to this small, populated island. After a three-century hiatus that ended in 1469, activity was dominated by flank crack eruptions sometimes accompanied by minor summit eruptions.

The lava flow during the eruption in 1983 buried the village of Ako, the largest on the island. In 2000, during the eruption, a summit caldera formed. During the eruption, a massive emission of volcanic gases volcanic gases occurred forcing the evacuation of the islanders.

 

Sources:

- Global Volcanism Program - Miyakejima

- Japan Meteorological Agency - Miyakejima

Miyakejima - plume of sulfur dioxide spotted by Sentinel-5P / Tropomi - Doc. DLR / Bira / ESA

Miyakejima - plume of sulfur dioxide spotted by Sentinel-5P / Tropomi - Doc. DLR / Bira / ESA

Activity on Nishinoshima remains significant; very high thermal anomalies are reported by Mirova between VRP 1437 and 2479 MW on June 24, 202.

VAAC Tokyo has issued a new ash dispersion advisory to the northeast.

 

Sources: Mirova, VAAC Tokyo and Japan Coast Guards.

 Nishinoshima - coalescence of craters and glowing projections in the ash plume - photo JCG 19.06.2020

Nishinoshima - coalescence of craters and glowing projections in the ash plume - photo JCG 19.06.2020

海上保安庁 海洋情報部 海域火山データベース https://www1.kaiho.mlit.go.jp/GIJUTSU... 2020/6/19 海上保安庁撮影動画 20200619_movie.mp4

Nishinoshima - thermal anomalies as of June 24 / 4:50 p.m. / Mirova and Volcanic Ash Advisory / VAAC Tokyo - one click to enlarge the thumbnails
Nishinoshima - thermal anomalies as of June 24 / 4:50 p.m. / Mirova and Volcanic Ash Advisory / VAAC Tokyo - one click to enlarge the thumbnailsNishinoshima - thermal anomalies as of June 24 / 4:50 p.m. / Mirova and Volcanic Ash Advisory / VAAC Tokyo - one click to enlarge the thumbnails

Nishinoshima - thermal anomalies as of June 24 / 4:50 p.m. / Mirova and Volcanic Ash Advisory / VAAC Tokyo - one click to enlarge the thumbnails

The Ingemmet, confirmed last Saturday June 20, during field inspections, the total destruction of the dome which was in the crater of the Sabancaya volcano.

Specialists from the Inggemmet Volcanological Observatory / OVI, used unmanned aerial vehicles (drones) and observed that the dome was completely destroyed, leaving blocks and fractures that produce gas and ash during explosions and emissions. gas continuous.

Video: https://twitter.com/i/status/1275602634980933632

 

Under these conditions, the probability of occurrence of high hazard scenarios decreases. However, Sabancaya will maintain moderate explosive activity, ash emissions being the main risk factor for the population of the Colca Valley.

In the past 24 hours, the OVI has recorded 5 explosions, with continuous emissions of gases and volcanic ash that reached 1,800 meters above the crater, dispersing in an east and southeast direction, having as possible affected the areas of the districts of Chivay, Achoma, Ichupampa, Yanque, Coporaque and the annex of Sallali.

 

Source: Ingemmet

Sabancaya  - photo Ingemmet 06.2020

Sabancaya - photo Ingemmet 06.2020

Fuego, in Guatemala, has a medium activity, with 12 low to moderate explosions per hour, and avalanches in the Seca barrance.

Around 2:30 p.m. on June 24, a moderate lahar descended the El Jute and Las Lajas barrancas, on its western flank and tributaries of the Achiguate and Guacalate rivers respectively. From 3.30 p.m. local time, a lahar is observed in the Secanca barranca, a tributary of the Rio Pantaleon.

Rains and thunderstorms raged over the Fuego, remobilizing ashes and metric blocks, trunks and branches of trees. These lahars could concern other drainages.

 

Source: Insivumeh

Fuego - explosive activity of 06.24.2020 - Photo Conred

Fuego - explosive activity of 06.24.2020 - Photo Conred

Fuego - 06.24.2020 / 11:03 am - explosion and avalanche of blocks - Insivumeh webcam

Fuego - 06.24.2020 / 11:03 am - explosion and avalanche of blocks - Insivumeh webcam

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