Miravalles Volcano | John Seach


Costa Rica

10.74 N, 85.15 W
summit elevation 2028 m

Miravalles volcano is located 34 km ENE of Liberia in the Cordillera del Guanacaste. It is a deeply eroded volcano without a crater.
The volcano is the site of a developed geothermal area. Miravalles geothermal field is located inside Guayabo caldera.

Groundwater from the geothermal system originates from the northern side of the volcanic chain.

Miravalles volcano is part of the Guanacaste Cordillera which was formed as a result of subduction of the Cocos Plate beneath the Caribbean Plate.

1997 Earthquake Swarm
Between 5-27 October 1997 an earthquake swarm occurred under the south flank of Miravalles volcano. The swarm consisted of 620 earthquakes.

1991-94 Seismicity
Between April 1991 and July 1994 there were 219 earthquakes measured at Miravalles caldera. The earthquakes occurred within a radius of 15 km of the geothermal field.

1946 Eruption
A small steam explosion occurred at Miravalles volcano in 1946.

Further reading
Gherardi, F., Panichi, C., Yock, A. and Gerardo-Abaya, J., 2002. Geochemistry of the surface and deep fluids of the Miravalles volcano geothermal system (Costa Rica). Geothermics31(1), pp.91-128.

Vaca, L., Alvarado, A. and Corrales, R., 1989. Calcite deposition at Miravalles geothermal field Costa Rica. Geothermics18(1-2), pp.305-312.

Miravalles Volcano Eruptions