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San Miguel volcano
stratovolcano 2130 m / 6,988 ft
El Salvador, 13.43°N / -88.27°W
Current status: normal or dormant (1 out of 5)
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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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San Miguel volcano news & activity updates

San Miguel (Chaparrastique) volcano (El Salvador): new explosion on 18 June 2016

Sun, 19 Jun 2016, 12:05
12:05 PM | BY: T
Explosion of Charrapastique during the early morning of 18 June (webcam installed in El Pacayal): incandescent ejecta reach approx. 400 m above the crater (SNET)
Explosion of Charrapastique during the early morning of 18 June (webcam installed in El Pacayal): incandescent ejecta reach approx. 400 m above the crater (SNET)
Seismic activity of San Miguel volcano (SNET)
Seismic activity of San Miguel volcano (SNET)
SO2 emission of San Miguel (SNET)
SO2 emission of San Miguel (SNET)
Ashfall in the morning (image: Rosario Benavides)
Ashfall in the morning (image: Rosario Benavides)
Deformatino plot of San Miguel showing inflation-deflation and again ongoing inflation (SNET)
Deformatino plot of San Miguel showing inflation-deflation and again ongoing inflation (SNET)
After several months of calm, explosive activity occurred in the early morning of 18 June 2016, generating small ash plumes and ejecting modest amount of incandescent ejecta around the summit crater.
The volcano's current crisis had started on 13 Dec 2013 when seismic activity increased. This culminated in the isolated, relatively large explosion on 29 Dec. Afterwards, the volcano remained restless afterwards with levels of seismicity up to 22 times higher than background. During 2014 and 2015, only few small explosions occurred, usually accompanied by peaks in seismic activity, similar as yesterday's event.
Since the beginning of 2016, seismicity had returned to almost normal levels and degassing had decreased significantly. However, this changed at the end of May.
SNET's seismometers recorded a very strong increase in tremor, related to circulation of fluids (gasses, water, magma) within the volcanic edifice. This first peak passed without surface activity, but another rise in seismic activity, along with increasing SO2 gas emissions (indicator of fresh magma) began on 13 June and was followed by yesterday's explosion.
Volcanologists also noted a slight inflation (swelling) had taken place on the northern flank of the volcano since August 2015. The trend had reversed during January-March 2016 but then again changed to inflation afterwards. This continues currently.
According to their special reports, volcanologists of SNET believe that these signals could be related to a small magmatic intrusion.

The explosion caused light ash fall in nearby downwind areas, but no significant damage. Since the eruption, the crater continued to show strong degassing, producing a plume that reached 400 m height.
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Links / Sources:
Previous news
Fri, 15 Jan 2016, 11:20
Degassing from San Miguel volcano yesterday (MARN)
The volcano continues to show strong degassing with light ash content, generating a plume that rises up to 1500 m from the crater and is being blown westwards. ... read all
Wed, 13 Jan 2016, 18:12
Ash emissions from San Miguel volcano this afternoon
A new phase of eruptive activity began at the volcano on Monday. Accompanied by a spike in volcanic tremor, weak to moderate ash emissions have been occurring from the main crater. This activity, the 22nd eruptive phase since Dec 2013 according to MARN, has been decreasing since yesterday. ... read all
Fri, 14 Aug 2015, 11:05
Seismicity at San Miguel since the beginning of 2015 (MARN)
Yesterday (13 Aug), a new ash emission occurred from the volcano, the first eruptive activity since early this year. Light ash fall occurred in areas up to 10 km west of the volcano in the small towns of San Jorge, Las Moritas and Piedrita. ... read all
Wed, 28 Jan 2015, 17:18
Ash plume from San Miguel's eruption on Monday (MARN)
A small explosion occurred last Monday at 06:43 morning. Probably phreatic in nature, it was the first eruptive activity since minor ash emissions past July. ... read all
Sun, 28 Dec 2014, 18:38
Pulsating steam emissions from Chaparrastique on 20 Dec 2014 (MARN)
The volcano remains restless with seismic activity above background and shows occasional pulsating gas and steam emissions. Overall, activity has been slowly decreasing over the past months. read all
 

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