The volcanic arc in Costa Rica developed as a result of subduction of the Cocos plate under the Caribbean plate.
Costa Rica lies close to 5 tectonic plates - Caribbean, Panama, Nazca, Cocos, and Atlantic.
Arenal
Orosi
Rincon de la Vieja
Miravalles
Tenorio
Platanar
Poas
Barva
Irazu
Turrialba