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| | CVO Website - San Salvador Volcano, El Salvador, Past Events |
 | | Pyroclastic-flow and tephra-fall deposits, known as the San Andrés tuff, are found at the rim of El Boquerón, and these deposits have been correlated with similar deposits, known as the Talpetate tephra fall, on the western flank of San Salvador volcano. |
 | | These old rocks of San Salvador volcano consist of blocky basaltic to andesitic lavas and tephras, and they are exposed at the bases of El Picacho and El Jabali and in scattered outcrops around the volcano. |
 | | Nevertheless, even accounting for the imperfections of the geologic record, evidence clearly indicates that San Salvador volcano erupts sufficiently frequently, with an annual probability of perhaps 1 in 1,000, that potential hazards from future eruptions need to be taken seriously, as densely populated areas will be at risk. |
| vulcan.wr.usgs.gov /Volcanoes/ElSalvador/Publications/OFR01-366/past_events_san_salvador.html (1424 words) |
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