Orosi

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 10.98°N
  • 85.473°W

  • 1659 m
    5442 ft

  • 345010
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Orosi.

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

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

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.

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

Deformation History


Information about Deformation periods will be available soon.

Emission History


There is no Emissions History data is available for Orosi.

Photo Gallery


The highest peak of the Orosí volcanic complex is Volcán Cacao, which is seen in this view from the SW. The summit of Cacao, 5.5 km SE of Orosí, was breached to the SW as a result of edifice collapse. 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 age of the latest activity of the Orosí complex is not known.

Photo by Cindy Stine, 1989 (U.S. Geological Survey).
See title for photo information.
The SW side of Volcán Cacao, located at the SE end of the Orosí volcanic massif, is cut by an arcuate depression created during a massive slope failure in which the summit of the volcano was removed. The vertical light-colored stripes on the upper edifice are rockslide scars. The latest eruptive activity at the Orosí complex consisted of post-collapse lava domes and flows from Cerro Cacao.

Photo by Cindy Stine, 1989 (U.S. Geological Survey).
See title for photo information.
The Orosí volcanic complex is seen here from the north, with the summit of Orosí in the clouds at the right and Volcán Cacao, the highest peak of the complex, at the left. Orosí is one of a cluster of four eroded and vegetated cones in the eastern part of Guanacaste National Park 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. Reported eruptions of Orosí in 1844 and 1849 may actually have been from Rincón de la Vieja volcano.

Photo by William Melson (Smithsonian Institution).
See title for photo information.
The low hill in the background is part of a massive debris-avalanche deposit formed by collapse of Volcán Cacao (also called Cerro Cacao). The avalanche swept onto the flat-lying Pacific coastal plain as far as the Central American highway, near where this photo was taken.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
See title for photo information.

Smithsonian Sample Collections Database


The following 16 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 116066-10 Ignimbrite -- --
NMNH 116066-14 Ignimbrite -- --
NMNH 116066-15 Ignimbrite -- 3 Feb 1985
NMNH 116066-16 Volcanic Rock -- --
NMNH 116066-20 lahar -- --
NMNH 116066-21 Ignimbrite -- --
NMNH 116066-22 Fe-Mn oxides Concretion -- --
NMNH 116066-23 Andesite -- --
NMNH 116066-25 Volcanic Rock -- --
NMNH 116066-27 lahar -- --
NMNH 116066-29 Fe-Mn oxides Concretion -- --
NMNH 116066-3 Ignimbrite -- 3 Feb 1985
NMNH 116066-31 Ignimbrite -- --
NMNH 116066-32 Quartz and other crystals -- --
NMNH 116066-349 Augite-Hypersthene Andesite -- 19 Apr 1985
NMNH 116066-5 Tuff -- 3 Feb 1985

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