Roundup of Global Volcanic Activity – New Activity for the Week 19 February 2020 – 25 February 2020

Huaynaputina | Peru : IGP reported that during 11 and 20-21 February small- to moderate-sized lahars descended the El Volcán drainage, on the S flank of Huaynaputina, and traveled to within 500 m of Quinistaquillas, in the province of Sánchez Cerro, Moquegua region.

Reykjanes | Iceland : On 25 February IMO reported that seismic activity at Reykjanes, in an area N of the town of Grindavík, had significantly decreased during the previous few days, and inflation was not detected in GPS and InSAR data. The Aviation colour Code was lowered to Green. Preliminary data suggested a small deflation signal beginning mid-February, though further analysis was needed for confirmation. The report warned the public not to explore lava tubes in the Eldvörp area as gas measurements showed a dangerous level of oxygen depletion; there are no pre-unrest measurements existing for comparison.

San Miguel | El Salvador : SNET reported that local observers of San Miguel reported a series of rumbling noises that occurred from 1900 on 20 February to 0750 on 21 February. The report noted an increase in amplitude of microearthquakes and minor gas emissions form the main crater. Sulfur dioxide levels had also increased. Beginning at 1055 on 22 February an ash emission that lasted 10 minutes long resulted in a small gas-and-ash plume that rose 400 m above the crater rim. Minor ashfall was reported in the area of Piedra Azul, 5 km SW. RSAM peaked at 510 units during the period of emissions, above the normal values of 150, as recorded by station VSM located on the upper N flank. The number of low-amplitude tremor events increased after a quiet period of about 11 hours and were associated with gas emissions; RSAM was 33-97 units and minor gas plumes were visible rising 400 m during 23-24 February.

Semisopochnoi | United States : AVO reported that intermittent, low-level tremor was detected at Semisopochnoi during 19-25 February. Brief periods of elevated tremor were recorded during 19-20 February. The Aviation colour Code remained at Orange and the Volcano Alert Level remained at Watch.

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