Concepción is an active stratovolcano
that forms the northwest part of the Isla de Ometepe. Concepción is 1,610 m (5,280 ft) tall and rests on a 1 km (3,300ft) thick base of Quaternarylacustrine mudstones.
It is considered a "pristine" volcano because there has been no influence of other volcanoes on its growth. The growth of the volcano comes in phases based on weaknesses of the crust that the volcano rests on. As it grows from additional magma
flow, the volcano grows in mass
and exerts pressure on the crust. This causes shifts which in turn cause more volcanic growth. This affects the magma chamber
which begins the cycle again with growth because of magmatic flow.
Since 1883, Concepción has erupted at least 25 times; its last eruption was on 9 March 2010.
Concepción's eruptions are characterized by frequent, moderate-sized explosions. Active fumaroles
are present just north of Concepción's summit crater.