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Random pictures
Current seismic signal San Salvador (GRDA station, SNET)
Wednesday, Jan 23, 2013
Small volcanic quakes and weak tremor are visible at the seismogram, but within normal levels for this active volcano. [more]
Thursday, Mar 22, 2012
The Mexican 7.4 magnitude earthquake near Acapulco on Tuesday might have affected the currently dormant San Salvador volcano in 1000 km distance and triggered an earthquake swarm under the volcano. ... [more]
 

San Salvador volcano eruptions

stratovolcano 1893 m / 6,211 ft
El Salvador, 13.73°N / -89.29°W
Eruption list: 1917, 1806 (?), 1671, 1658, 1572 ± 2, ?1200, 640 AD ± 30 years


1999 unrest
A small seismic swarm occurred in August 1999, when volcano-tectonic earthquakes about 5 km from the crater were detected. No other signs of unrest were noted.

1917 eruption
Eruption from Boqueroncito (from Kumar, 1957)The last eruption of San Salvador volcano began on 6 June 1917 following strong and destructive earthquakes lasting for 2 hours. The eruption consisted of an effusive fissure eruption on the NW flank followed by a moderately explosive summit eruption (similar, but smaller in scale, to the Eyafjallajökull eruption in 2010).
The effusive phase produced a large aa lava flow on the NW flank, left a row of cinder cones on the eruptive fissure, and lasted about a week. The second phase started simultaneously with the waning of the waning of the first phase from a fissure vent inside the summit crater. It quickly evaporated a former 400 m wide lake and built the small Boqueroncito cinder cone.
 

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