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Miravalles volcano

Stratovolcano 2028 m / 6,653 ft
Costa Rica, 10.75°N / -85.15°W
Current status: dormant (1 out of 5) | Reports
Miravalles volcano books
Typical eruption style: unspecified
Miravalles volcano eruptions: 1946 
TimeMag. / DepthDistanceLocation
Tue, 19 Jun
Tue, 19 Jun 14:41 UTCM 4.6 / 176 km18 km7 km al Sur de Upala, Alajuela.
Mon, 21 May
Mon, 21 May 13:31 UTCM 2.9 / 6 km7 km8 km al Noreste de Tierras Morenas, Tilaran.

Background:

Miravalles is a 2028-m-high andesitic stratovolcano that is one of five post-caldera cones along a NE-trending line within the broad 15 x 20 km Guayabo (Miravalles) caldera. The caldera was formed during several major explosive eruptions that produced voluminous dacitic-rhyolitic pyroclastic flows between about 1.5 and 0.6 million years ago. Growth of post-caldera volcanoes in the eastern part of the caldera that overtopped much of the eastern and southern caldera rims was interrupted by edifice collapse that produced a major debris avalanche to the SW. Morphologically youthful lava flows cover the western and SW flanks of the post-caldera Miravalles complex, which rises above the town of Guayabo on the flat western caldera floor. The only reported historical eruptive activity was a small steam explosion on the SW flank in 1946. High heat flow remains, and Miravalles is the site of the largest developed geothermal field in Costa Rica.
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Smithsonian / GVP volcano information


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