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Volcano-hazard zonation for San Vicente volcano, El Salvador

Open-File Report 2001-367

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Abstract

San Vicente volcano, also known as Chichontepec, is one of many volcanoes along the volcanic arc in El Salvador. This composite volcano, located about 50 kilometers east of the capital city San Salvador, has a volume of about 130 cubic kilometers, rises to an altitude of about 2180 meters, and towers above major communities such as San Vicente, Tepetitan, Guadalupe, Zacatecoluca, and Tecoluca. In addition to the larger communities that surround the volcano, several smaller communities and coffee plantations are located on or around the flanks of the volcano, and major transportation routes are located near the lowermost southern and eastern flanks of the volcano. The population density and proximity around San Vicente volcano, as well as the proximity of major transportation routes, increase the risk that even small landslides or eruptions, likely to occur again, can have serious societal consequences.


The eruptive history of San Vicente volcano is not well known, and there is no definitive record of historical eruptive activity. The last significant eruption occurred more than 1700 years ago, and perhaps long before permanent human habitation of the area. Nevertheless, this volcano has a very long history of repeated, and sometimes violent, eruptions, and at least once a large section of the volcano collapsed in a massive landslide. The oldest rocks associated with a volcanic center at San Vicente are more than 2 million years old. The volcano is composed of remnants of multiple eruptive centers that have migrated roughly eastward with time. Future eruptions of this volcano will pose substantial risk to surrounding communities.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Volcano-hazard zonation for San Vicente volcano, El Salvador
Series title:
Open-File Report
Series number:
2001-367
Year Published:
2001
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Vancouver, WA
Contributing office(s):
Cascades Volcano Observatory, Volcano Science Center
Description:
Report: 21 p.; Plate: 49.11 x 34.11 inches
Number of Pages:
22
Country:
El Salvador
City:
Guadalupe;San Vicente;Tecoluca;Tepetitan;Zacatecoluca
Other Geospatial:
San Vicente Volcano
Datum:
North American 1927
Projection:
Universal Transverse Mercator projection
Scale:
50000
Additional Online Files(Y/N):
Y