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Orosí volcano

Stratovolcanoes 1659 m / 5,443 ft
Costa Rica, 10.98°N / -85.47°W
Current status: (probably) extinct (0 out of 5) | Reports
Orosí volcano books
Typical eruption style: unspecified
Orosí volcano eruptions: unknown, no recent eruptions
TimeMag. / DepthDistanceLocation
Sat, 6 Oct
Sat, 6 Oct 00:35 UTCM 4.1 / 3 km9 km5 km al Oeste de Aguas Claras, Upala.
Tue, 18 Sep
Tue, 18 Sep 10:30 UTCM 3.7 / 145 km14 km6 km al Norte de Aguas Claras, Upala.
Sat, 8 Sep
Sat, 8 Sep 21:44 UTCM 3.4 / 59 km35 km23 km al Oeste de Canas Dulces, Liberia.
Mon, 27 Aug
Mon, 27 Aug 17:28 UTCM 2.9 / 3 km22 km14 km al Noroeste de Canas Dulces, Liberia.
View all recent quakes

Background:

Orosí is one of a cluster of four eroded and vegetated cones in the Guanacaste Range at the NW corner of Costa Rica. Volcán Orosí itself has a conical shape as viewed from the north or west, but its flanks are heavily eroded. The complex includes Orosí, Orosilito, Volcán Pedregal, and Cacao. The highest peak of the volcanic complex is 1659-m-high Volcán Cacao, 5.5 km SE of Orosí. The summit of Cacao is cut by two large horseshoe-shaped calderas breached to the SW and east related to edifice collapse. The age of the latest activity of the Orosí complex is not known. Historical eruptions were reported from Orosí in 1844 and 1849, but even at the time of the first volcanological observations at the end of the 19th century, Orosí was overgrown with large trees, and the eruptions may actually have been from neighboring Rincón de la Vieja volcano. The latest documented volcanic activity at Orosí produced mudflows (perhaps secondary) about 3500 years ago.
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Smithsonian / GVP volcano information


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