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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

The unrest continues at the Great Sitkin volcano. During the last day, numerous earthquakes and small explosions were recorded on local infrasound and seismic stations.

The dome has been expanding since mid-July and the last explosive event was on May 25, 2021. AVO is monitoring and using satellite imagery to measure the rate of growth. It now measures more than 100 meters in diameter.

At night, the people of Adak about 26 miles across the water report the plume of steam lit by the incandescent lava atop the dome. On August 5, local observers reported a low-level lava fountain at the active vent that was also visible from Adak Island. A robust volcanic cloud was observed in web camera views of the volcano throughout the day. This cloud extends north-northeast below about 10,000 feet above sea level. It is probably composed mainly of volcanic gases and water vapor, but could include some amount of ashes.

Current volcano alert level: Watch
Current Aviation Color Code: Orange

 

Source: AVO

Great sitkin - The Growing Dome on 04.08.2021 - photo courtesy Dave Ward, via AVO

Great sitkin - The Growing Dome on 04.08.2021 - photo courtesy Dave Ward, via AVO

A moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano

An explosion was seen on August 4 from the Luzon Caldera.

A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds.

The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters.

 

Source: KVERT & KSCNET

Moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano  An explosion was seen on August 4 from the Luzon Caldera.  A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds.  The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters.     Source: KVERT & KSCNET

Moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano An explosion was seen on August 4 from the Luzon Caldera. A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds. The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters. Source: KVERT & KSCNET

In the Reykjanes peninsula, the tremor of the eruption of Fagradalsfjall is more fluctuating at the beginning of August, but it starts to increase gradually on August 5.

On August 5 in the morning, the webcams let see an incandescence at the level of the crater and a notable degassing on the lava field.

In the evening, lava comes out of the crater in Geldingadalur, and flows in a few branches and waterfalls in Meradalur, ... the crater rim collapsed considerably yesterday, and the lava may have found new flowings ways.

Around 11 p.m., we cannot doubt the continuation of the eruption.

 

Sources: Visir webcams, mbls, Almannavarnir and RUV / Böðvar Sveinsson

Fagradalsfjall - tremor at 06.08.2021 - Doc Hraun.vedur

Fagradalsfjall - tremor at 06.08.2021 - Doc Hraun.vedur

Fagradalsfjall - incandescence at the crater on 04.08.2021 / 11:29 pm - Visir webcam - one click to enlarge

Fagradalsfjall - incandescence at the crater on 04.08.2021 / 11:29 pm - Visir webcam - one click to enlarge

Fagradalsfjall - on 05.08.2021 / 01h51 - Visir webcam - one click to enlarge

Fagradalsfjall - on 05.08.2021 / 01h51 - Visir webcam - one click to enlarge

Fagradalsfjall - strong degassing in the lava field 05.08.2021 / 07h20 - webcam langihryggur NV - one click to enlarge

Fagradalsfjall - strong degassing in the lava field 05.08.2021 / 07h20 - webcam langihryggur NV - one click to enlarge

Fagradalsfjall - lava comes out of the crater and forms new flows 05.08.2021 / 22h29 - mbls webcam - one click to enlarge

Fagradalsfjall - lava comes out of the crater and forms new flows 05.08.2021 / 22h29 - mbls webcam - one click to enlarge

Sunny spells on the small islands of Papua New Guinea at the beginning of August allowed satellite images / Sentinel-2 for Manam and Kadovar

Regarding Manam, Mirova reports moderate thermal anomalies between August 2 and 5, of VRP between 4MW and 71MW, while the Sentinel-2 images show a degassing towards the west, then towards the OSO.

Concerning Kadovar, a degassing towards the ONO and the vapor remaining in the lower layers, as well as a slight hot spot are visible by Sentinel-2

 

Sources: Sentinel-2 & Mirova

Manam - degassing 02.08.2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Manam - degassing 02.08.2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Manam - Thremic anomalies at 05.08.2021 - Doc. Mirova MODIS_Latest10NTI

Manam - Thremic anomalies at 05.08.2021 - Doc. Mirova MODIS_Latest10NTI

Kadovar - image Sentinel-2 bands 12,11,4 du02.08.2021 - one click to enlarge

Kadovar - image Sentinel-2 bands 12,11,4 du02.08.2021 - one click to enlarge

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