Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Miravalles
Miravalles volcano rises above a thermal area on its SW flank. The 2028-m-high andesitic stratovolcano is one of five post-caldera cones constructed along a NE-trending line within the Pleistocene 15 x 20 km Miravalles caldera. Morphologically youthful lava flows cover the western and SW flanks of the volcano. The only reported historical eruptive activity was a small steam explosion in 1946, although high heat flow remains, and a producing geothermal field is located within the caldera. Photo by William Melson, 1988 (Smithsonian Institution)
Volcano Number:345030
Volcano Name:Miravalles
Country:Costa Rica
Volcano Type:Stratovolcano
Last Eruption:1946 CE
Elevation:2028m
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:79
Pop. within 10km:7492
Pop. within 30km:61875
Pop. within 100km:757945
Latitude:10.748
Longitude:-85.153



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
345030 Miravalles 11135 Confirmed Eruption Tephrochronology -5050
345030 Miravalles 11136 Confirmed Eruption 1 SW flank (near Las Hornillas) Historical Observations 1946/9/14 1946/9/14
Emissions Data from the Global Volcanism Program of the Smithsonian Institution
Sorry. No emissions data found for this volcano.


Data from the Earthchem Library
Title Author Release Date DOI Link
Regional variations in volatile composition: Isotopic evidence for carbonate recycling in the Central American volcanic arc Snyder, Glen 2015-07-01 10.1594/IEDA/100547 Details
Data from the Earthchem Portal
Sorry. No data exist for this volcano in the EarthChem Portal.


Data from the SESAR Database


Data from the MaGa Database
Location: Las Pailas geothermal field (View Details at MaGa DB)
Description: The Las Pailas is a liquid-dominated two-phase reservoir with temperatures of 220–255 8C (at a depth of about 600–700 m) (Castro 2002), located at the southern flank of the volcano Rincon de la Vieja, Guanacaste Volcanic Cordillera. It shows surface manifestations such as vapour discharges from fumaroles and steam-heated pools.
Hazard Description: not reported
Type: soil_diffuse_emission
Region: Provincia Guanacaste
Country: Costa Rica
Volcanic Complex: Miravalles
Gas Flux Data:
Measurement Name Detail Date Specie Flux Std. Dev. Unit of Measure
Las Pailas__01012015 Detail 2015/01/01 CO2 3.3 0 Mg/d

Location: Las Hornillas geothermal field (View Details at MaGa DB)
Description: Las Hornillas (that comes from “horno” – oven) is located near the Miravalles Geothermal Project in « La Fortuna de Bagaces », that generates electricity thanks to the force of the master steams in the subsoil. Las Hornillas is a 26,900 square feet crater with volcanic action: fumaroles, boiling mud of various colours, crystallization of sulphur, hot water.
Hazard Description: not reported
Type: soil_diffuse_emission
Region: Guanacaste Province, Costa Rica
Country: Costa Rica
Volcanic Complex: Miravalles
Gas Flux Data:
Measurement Name Detail Date Specie Flux Std. Dev. Unit of Measure
Las Hornillas_01012015 Detail 2015/01/01 CO2 135 0 Mg/d