Report on San Miguel (El Salvador) — 6 August-12 August 2014
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
6 August-12 August 2014
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2014. Report on San Miguel (El Salvador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 6 August-12 August 2014. Smithsonian Institution and US Geological Survey.
13.434°N, 88.269°W; summit elev. 2130 m
All times are local (unless otherwise noted)
SNET reported low seismic activity and reduced emissions at San Miguel during 6-12 August. A remote camera and infrared visual display showed mild white fumerolic emissions rose less than 200 m above the crater. Heavy rain has contributed to a debris flow recorded by a station 1.7 km from the north flank on 9 August. On 11 August instruments recorded additional mud flows. SNET reported property damage and two people were affected by these flows.
Geological Summary. The symmetrical cone of San Miguel, one of the most active volcanoes in El Salvador, rises from near sea level to form one of the country's most prominent landmarks. A broad, deep, crater complex that has been frequently modified by eruptions recorded since the early 16th century caps the truncated unvegetated summit, also known locally as Chaparrastique. Flanks eruptions of the basaltic-andesitic volcano have produced many lava flows, including several during the 17th-19th centuries that extended to the N, NE, and SE. The SE-flank flows are the largest and form broad, sparsely vegetated lava fields crossed by highways and a railroad skirting the base of the volcano. Flank vent locations have migrated higher on the edifice during historical time, and the most recent activity has consisted of minor ash eruptions from the summit crater.