Volcanos

Roundup of Global Volcanic Activity – New Activity for the week 31 August – 6 September 2022

Chikurachki – Paramushir Island (Russia) : KVERT reported that an ash plume from Chikurachki was identified in satellite images drifting 94 km ESE on 26 August. According to the Tokyo VAAC an ash plume was identified in satellite images at 1730 on 2 September, local time, drifting NE at an altitude of 3.7 m (12,000 ft).

Karthala – Grand Comore Island : A significant increase in the number of small earthquakes beneath Karthala’s W flank began to be detected on 15 July. The abnormal activity persisted.

Marapi – Central Sumatra : In a special notice posted on 2 September PVMBG reported that tiltmeter deformation data for Marapi showed a trend of inflation at the summit and deflation along the flanks. Seismicity continued to fluctuate with the dominating signal indicating hydrothermal activity. A phreatic eruption was the most likely kind of volcanic activity that could occur at the volcano, based on the recent data, and it could occur without warning.

Semisopochnoi – Aleutian Islands (USA) : AVO reported ongoing low-level seismicity and steam emissions at Semisopochnoi during 30 August-6 September. Weakly elevated surface temperatures were identified in satellite images during 1-2 September. Several small ash eruptions from the N crater of Mount Cerberus were visible in webcam images during 2-3 September and detected in seismic and infrasound data. Satellite and webcam views were cloudy during 4-5 September.

Ta’u – American Samoa (SW Pacific) : HVO reported that an earthquake swarm around Ta’u, in the Manu’a Islands of American Samoa, continued during 30 August-6 September. Less than 30 earthquakes per day were large enough to be felt by residents and many more earthquakes undetectable by humans were also recorded; no earthquakes were reportedly felt during 5-6 September. The data suggested that the earthquakes were consistently occurring in an area about 5-15 km off the N shore of the island, at depths of 10-15 km below the surface. There was no change in the frequency or size of earthquakes and the position of the swarm remained unchanged. USGS staff installed GPS equipment during 4-6 September.

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