Geologic Background:
Tecapa is a complex stratovolcano at the
northern end of a cluster of volcanoes west of San Miguel
volcano. Tecapa contains a summit crater lake below a
deep notch in the east crater rim. Several youthful lava
flows and cones, such as Cerro Alegria and Berlin, occur
on the flanks of Tecapa. The Holocene lava cone of Cerro
Oromontique is located at the SE base along a fissure
trending SE from Cerro Alegria. The volcano currently
displays fumarolic activity and contains a producing
geothermal plant.
Historic Activity:
Recent Activity:
- An earthquake swarm during late April, 1985 resulted
in an 8-km-long graben forming on the NW flank of the
volcano. The N40W striking graben is 800 to 1000 m wide,
with a vertical offset of 30 cm.
Data Sources:
- Smithsonian's SEAN Bulletin (V. 10, No. 5).
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