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San Miguel volcano (Eastern El Salvador) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 November-22 November 2022 (New Activity / Unrest)

Wed, 23 Nov 2022, 15:00
15:00 PM | BY: VN
MARN reported that an eruption at San Miguel's central crater began on 15 November, and by 1100 on 20 November a total of 62 phreatic explosions had been recorded, averaging 10 per day. An additional 24 explosions were recorded from 1100 on 20 November to 1100 on 21 November and 12 more were recorded between 1100 and 1100 during 21-22 November. Explosions generated gas, ash, and steam plumes that generally rose around 500 m above the crater rim, though at 1336 on 18 November and 1206 on 19 November eruption plumes rose as high as 1.1 km.
Some of the events were accompanied by crater incandescence during 15-20 November. Sulfur dioxide emissions generally averaged 100-170 tons per day, below the baseline of 300 tons per day. Specific measurements during explosive events revealed that the emissions were sometimes higher; 1,200 tons per day was measured on 19 November during one of the largest explosions, and 378 tons per days was measured during an explosion on 21 November.
Seismicity was characterized by volcano-tectonic events, long-period events, and tremor. Deformation data showed no significant changes. The public was warned to stay 2 km away from the volcano, and for those living within a 2-5 km radius to identify evacuation routes and to take preparation measures as guided by the Sistema Nacional de Protección Civil.

Source: Ministerio de Medio Ambiente y Recursos Naturales (MARN)
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From: Global Volcanism Program, 2022. Report on San Miguel. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 16 November-22 November 2022. Smithsonian Institution and US Geological Survey.

Previous news

Thu, 17 Nov 2022, 08:47

San Miguel volcano (El Salvador): small explosions yesterday

Small explosion from San Miguel volcano yesterday (image: Ministerio de Medio Ambiente)
The explosive eruption at the volcano continues. ... Read all
Show more
San Miguel volcano
stratovolcano 2130 m / 6,988 ft
El Salvador, 13.43°N / -88.27°W
Current status: minor activity or eruption warning (3 out of 5) San Miguel volcano eruptions:
2015, 2014, 2013, 2002, 1997, 1995, 1985-86, 1976-77, 1970, 1967, 1966 (Jul), 1966 (Feb), 1964, 1954, 1939, 1936(?), 1931, 1930, 1929, 1919-20, 1890-91, 1884, 1882, 1867-68, 1862, 1857, 1855, 1854(?), 1844-48, 1819, 1811(?), 1798(?), 1787, 1769, 1762, 1699, 1510 ± 5 years
Typical eruption style
small to moderate phreatic and phreatomagmatic summit explosions
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