Guazapa

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 13.9°N
  • 89.12°W

  • 1438 m
    4717 ft

  • 343052
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Guazapa.

The Global Volcanism Program has no Weekly Reports available for Guazapa.

The Global Volcanism Program has no Bulletin Reports available for Guazapa.

Guazapa is a massive, eroded Pleistocene stratovolcano that rises 1000 m above the surrounding countryside NE of the capital city of San Salvador. The 1438-m-high basaltic volcano has no trace of its original summit crater, and deep canyons cut its flanks. Several young Holocene pyroclastic cones and lava flows of similar composition are found at the base of the volcano (Williams and Meyer-Abich, 1955). The Macanze scoria cone at the SE base of the volcano was considered to have probably been active only a few thousand years ago, however Weber and Wiesemann (1978) did not map Holocene vents in this area.

The Global Volcanism Program is not aware of any Holocene eruptions from Guazapa. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Guazapa page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.



Cones
Feature Name Feature Type Elevation Latitude Longitude
Macanze, Cerro
    Nacanze, Cerro
Cinder cone 789 m 13° 52' 0" N 89° 4' 0" W
Tecomatepe, Cerro Stratovolcano 1017 m 13° 51' 0" N 89° 3' 0" W
Guazapa is a massive, eroded Pleistocene stratovolcano that rises 1000 m above the surrounding countryside NE of the capital city of San Salvador. The 1438-m-high basaltic volcano is seen here from the SW. It has no trace of its original summit crater, and deep canyons cut its flanks. Several relatively young pyroclastic cones and lava flows of similar basaltic composition are found at the base of the volcano, although their age is not known precisely.

Photo by Carlos Pullinger, 1996 (Servicio Nacional de Estudios Territoriales, El Salvador).
Guazapa volcano is seen here from the west, 3 km north of the town of Guazapa. This eroded stratovolcano is of Pleistocene age and is one of the largest volcanoes of the interior valley of El Salvador. Deep canyons dissect the volcano, but relatively young pyroclastic cones and lava flows are found around its base.

Photo by Giuseppina Kysar, 1999 (Smithsonian Institution).
The massive Pleistocene Guazapa stratovolcano (left-center) is seen here in an aerial view from the SW with the Río Lempa behind it. The youngest flank vent of Guazapa is Cerro Macanze, which lies on the SE flank of the volcano, behind the two small volcanoes in the right-center part of the photo. The dark-colored unvegetated lava flow in the foreground was erupted in 1917 from the flank of San Salvador volcano.

Photo by Paul Kimberly, 1999 (Smithsonian Institution).
The western side of Lake Ilopango is seen from the southern rim of Ilopango caldera. The broad peak on the right-hand horizon is Guazapa, a Pleistocene volcano in the Interior Valley of El Salvador that has young pyroclastic cones at its base. The northern wall of Ilopango caldera rises about 400-500 m above the lake. Much of the caldera rim is covered with a thick blanket of deposits from the caldera-forming eruptions, but some lava domes are exposed in the caldera wall.

Photo by Bill Rose, 1978 (Michigan Technological University).
Volcán de Guazapa (right center) rises beyond Cerrón Grande reservoir (lower right) in this view from the NE. The low peak to the left of Guazapa is Cerro Tecomatepe. A solitary cloud lies below the summit of San Salvador volcano (upper left). The Santa Ana complex forms the broad massif at the upper right; sharp-topped Izalco volcano is visible at the left side of the massif, and peaks of the Sierra Apaneca near the Guatemalan border form the irregular ridge to the right of Santa Ana.

Photo by Lee Siebert, 2002 (Smithsonian Institution).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Weber H S, Wiesemann G, 1978. Mapa Geologico de la Republica de El Salvador/America Central. Bundesanstalt fur Geowissenschaften und Rohstoffe, Hannover, Germany, 1:100,000 scale geologic map in 6 sheets.

Williams H, Meyer-Abich H, 1955. Volcanism in the southern part of El Salvador with particular reference to the collapse basins of Lakes Coatepeque and Ilopango. Univ Calif Pub Geol Sci, 32: 1-64.

Volcano Types

Stratovolcano
Cinder cone(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Major
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
6,492
94,131
2,488,228
6,800,406

Affiliated Databases

Large Eruptions of Guazapa Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.