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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) 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

San Miguel volcano news & activity updates

San Miguel volcano (El Salvador): new eruption

Tue, 31 Dec 2013, 06:21
06:21 AM | BY: T
Eruption plume from today's explosion at San Miguel (photo: La Prensa Grafica)
Eruption plume from today's explosion at San Miguel (photo: La Prensa Grafica)
Ash fall in San Jorge (La Prensa Grafica)
Ash fall in San Jorge (La Prensa Grafica)
Aqua/MODIS image of the eruption plume from San Miguel in El Salvador, seen on December 29, 2013. Image: NASA, rectified by Nahum Chazarra.
Aqua/MODIS image of the eruption plume from San Miguel in El Salvador, seen on December 29, 2013. Image: NASA, rectified by Nahum Chazarra.
Seismic signal (29 Dec) during the eruption (LYC station, MARN)
Seismic signal (29 Dec) during the eruption (LYC station, MARN)
Part of the hazard map of San Miguel (MARN)
Part of the hazard map of San Miguel (MARN)
The new eruption that occurred at the volcano Sunday (29 Dec) morning at 10:50 am local time has so far been an isolated single explosion of vulcanian type (accumulated pressure ejecting the plug in the conduit). Current seismic activity is low, but more activity could follow.
The explosion produced an ash plume of considerable (3-8 km) height, reaching estimated altitudes of 5-10 km. Heavy ash fall followed the eruption in nearby areas downwind, such as in the towns of Chinameca and San Jorge to the west. Civil Protection immediately began to evacuate families residing in a radius of 3 km around the volcano. So far, more than 5000 persons have been ordered to evacuate.
The following video from MARN's webcam shows the onset of the powerful explosion, accompanied by a (fortunately only) small pyroclastic flow (starting a 8sec):

The second largest city of the country, San Miguel de la Frontera (approx. 250,000 inhabitants) is located only 7 km NE of the volcano and could be at risk if the eruption continues and starts to produce pyroclastic flows (see hazard map of MARN).
Satellite images showed the plume shortly after the explosion stretching over approx. 150 km length.
Seismic data showed a steep increase in earthquake activity starting at 06:30 local time. After the explosion, seismic activity dropped again, suggesting that
Previous news
Sat, 6 Apr 2013, 15:08
Current seismic recording from San Miguel (VSM station, SNET)
Volcanic earthquakes embedded in weak tremor remain frequent. ... read all
Tue, 19 Mar 2013, 14:48
Yesterday's seismic recording from San Miguel (VSM station, SNET)
The volcano has been relatively quiet recently. Only few volcanic quakes, weak tremor and (probably) rockfall signals show up now and then. ... read all
Thu, 7 Mar 2013, 16:47
Current seismic signal from San Miguel (VSM station, SNET)
Seismic unrest (fluctuating, sometimes strong volcanic tremor and earthquakes) continue. Several hot spots are visible on the volcano's flanks, but most likely caused by fires. ... read all
Tue, 5 Feb 2013, 16:12
Current seismic signal from San Miguel (VSM station, SNET)
Activity has somewhat increased during the past 24 hours, including a pulse of stronger tremor and numerous small volcanic quakes. ... read all
Mon, 4 Feb 2013, 13:37
Tremor has remained at unchanged, weak levels today. ... read all

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