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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
Karymsky - plume of an explosion at more than 2,500 m.asl. - photo 27.08.2021 -N. Gorbach. / IVS FEB RAS

Karymsky - plume of an explosion at more than 2,500 m.asl. - photo 27.08.2021 -N. Gorbach. / IVS FEB RAS

Moderate eruptive activity of the Karymsky volcano continues. According to satellite data, an ash plume extends 42 km east-northeast of the volcano.

Moderate eruptive activity of the volcano continues. Ash explosions up to 6-7 km. altitude. could arise at any time. The current activity could affect low-flying aircraft.
Volcanic cloud height: 1500-1600 m (4920-5248 ft) AMSL Time and method of ash plume / cloud height determination: 20210827 / 0430Z - Himawari-8
Distance of ash plume / cloud of the volcano: 42 km (26 mi)
Direction of drift of ash plume / cloud of the volcano: ENE / azimuth 75 deg

 

Source : KVERT

Kilauea - intrusive activity from 23 to 30 August 2021 - Doc.HVO - one click to enlarge

Kilauea - intrusive activity from 23 to 30 August 2021 - Doc.HVO - one click to enlarge

The map above illustrates the intrusive activity detected over the past week at the Kīlauea volcano. The initial swarm of small earthquakes from August 23 to 25 was centered in the southern region of the caldera, as shown on the map. A second swarm started late August 26 in the same area; the number of earthquakes dropped the next day, but they stayed above background levels and the epicenters moved away from the caldera towards the Southwest Rift Connector.

In the past 24 hours, around 98 earthquakes have been recorded at the top of Kīlauea and south of the Kīlauea caldera. Most of the earthquakes were below magnitude 2 and occurred about 1-4 km (0.6-2.5 mi) below the surface. These small earthquakes occurred up to 8 earthquakes detected per hour. These earthquake rates are significantly lower than those seen during pulses of activity last week.

Ground deformation, as measured by inclinometers and GNSS (GPS) instruments, appears to be concentrated in the dotted ellipse on the map. The Southwest Rift Connector (also labeled on the map) is an underground passage for magma in the Southwest Rift Zone of Kīlauea, and for decades it has been a known source area for seismicity. The connector region is offset to the southeast from the main lineament of the eruptive vents marking the Southwest Rift Zone, as evidenced by the 1971 eruptive vents and the 1919-1920 Maunaiki Lava Shield on the map. Eruptions from the connector itself are believed to be rare, although a brief but dramatic eruption occurred in this region on December 31, 1974, producing a lava flow that traveled over 12 km (7.5 mi). towards the southwest.

The volcanic alert remains in advisory and the aviation code in Yellow.

 

Sources: HVO daily reports

Suwanosejima - 08.30.2021 / 6:39 p.m. - JMA webcam

Suwanosejima - 08.30.2021 / 6:39 p.m. - JMA webcam

The activity of Suwanosejima continues.

An eruptive episode occurred at Suwanosejima (Mount Ontake Crater) at 9:22 p.m. on August 30, and the eruption plume rose 2,800 m above the crater rim.
The volcanic ash drifts, t towards the southwest of the crater, and within an hour there was a fairly large amount of ash in the village of Toshima,

Another eruptive episode occurred at 10:22 a.m. on August 31, and the plume rose 1,800 m above the crater rim. Volcanic ash was carried westward from the crater, and at 4:00 p.m. on the 31st, there was a small ashfall in Toshima Village, and Kagoshima Prefecture.

 

Source: JMA

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