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Orosí

Photo of this volcano
  • Costa Rica
  • México and Central America
  • Stratovolcano(es)
  • Unknown - Evidence Uncertain
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 10.98°N
  • 85.473°W

  • 1659 m
    5443 ft

  • 345010
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Orosí.

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

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

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.

Eruptive History

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

Deformation History

There is no Deformation History data available for Orosí.

Emission History

There is no Emissions History data available for Orosí.

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.
GVP Map Holdings

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Aparatos Volcanico de Costa Rica
Publisher: IGN & Observatorio Volc & Sismo de CR
Country: Costa Rica
Year: 1987
Map Type: Geographic
Scale: 1:750,000
Map of Aparatos Volcanico de Costa Rica

Title: Liberia
Publisher: IGNCR
Country: Costa Rica
Year: 1982
Series: E561
Map Type: Geology
Scale: 1:200,000
Map of Liberia

Title: San Carlos
Publisher: IGNCR
Country: Costa Rica
Year: 1982
Series: E561
Map Type: Geology
Scale: 1:200,000
Map of San Carlos

Title: Mapa del Vulcanismo Plio-Pleistoceno
Publisher: Universidad de Costa Rica with IGN
Country: Costa Rica
Year: 1980
Map Type: Geology
Scale: 1:700,000
Map of Mapa del Vulcanismo Plio-Pleistoceno

Title: Upala
Publisher: IGCR
Country: Costa Rica / Nicaragua
Year: 1966
Series: E761
Map Type: Topographic
Scale: 1:50,000
Map of Upala

Title: Lago De Nicaragua
Publisher: US Army Map Service
Country: Nicaragua/Costa Rica
Year: 1959
Series: AMS 1301
Map Type: Topographic
Scale: 1:1,000,000
Map of Lago De Nicaragua

Title: Liberia
Publisher: IGNCR for IGM
Country: Costa Rica
Year: 1944
Map Type: Geology (Geomorphology)
Scale: 1:200,000
Map of Liberia

Title: Granada
Publisher: Geographic Branch (G2) General Staff U. S. A.
Country: Nicaragua / Costa Rica
Year: 1930
Series: 107
Map Type: Unknown
Scale: 1:250,000
Map of Granada

Title: Liberia
Publisher: Geographic Branch (G2) General Staff U. S. A.
Country: Nicaragua / Costa Rica
Year: 1929
Series: 107
Map Type: Unknown
Scale: 1:250,000
Map of Liberia
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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