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San Salvador
"The massive compound San Salvador volcano dominates the landscape west of El Salvador's capital city of San Salvador. The dominantly andesitic Boquerón stratovolcano has grown within a 6-km-wide caldera, whose rim is partially exposed at Picacho and Jabalí peaks, that formed by collapse of an older San Salvador volcano about 40,000 years ago. The summit of Boquerón is truncated by a steep-walled crater 1.5 km wide and about 500 m deep that formed during a major eruption about 800 years ago. It contained a crater lake prior to an eruption during 1917 that formed a small cinder cone on the crater floor; a major north-flank lava flow also erupted in this year. Three fracture zones that extend beyond the base of San Salvador volcano have been the locus for numerous flank eruptions, including two that formed maars on the WNW and SE sides. Most of the four historical eruptions recorded since the 16th century have originated from flank vents, including two in the 17th century from the NW-flank cone of El Playón, during which explosions and a lava flow damaged inhabited areas."  -Smithsonian Volcano Archive
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