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Cosiguina volcano, Nicaragua
Cosiguina, seen here from the east, is a low basaltic-to-andesitic composite volcano that forms a large peninsula at the NW tip of Nicaragua along the Gulf of Fonseca.
The 872-m-high volcano has a pronounced somma rim, which forms the ridge seen here at the right behind the far crater rim.
The younger cone is truncated by a large elliptical prehistorical summit caldera 2 x 2.4 km in diameter and 500 m deep, which is now filled by a lake.
It was the source of a major explosive eruption in 1835, Nicaragua's largest during historical time.
Cosiguina is a low basaltic-to-andesitic composite volcano that is isolated from other eruptive centers in the Nicaraguan volcanic chain.
The 872-m-high stratovolcano forms a large peninsula extending into the Gulf of Fonseca at the western tip of the country.
Cosiguina (also spelled Coseguina) has a pronounced somma rim on the northern side; a young summit cone of Cosiguina rises 300 m above the northern somma rim and buries the rim on other sides.
The younger cone is truncated by a large elliptical prehistorical summit caldera, 2 x 2.4 km in diameter and 500 m deep, with a lake at its bottom.
Lava flows predominate in the caldera walls, although lahar and pyroclastic-flow deposits surround the volcano.
In 1835 Cosiguina was the source of a brief, but powerful explosive eruption that was Nicaragua's largest during historical time.
Ash fell as far away as Mexico, Costa Rica, and Jamaica, and pyroclastic flows reached the Gulf of Fonseca.
PHOTO SOURCE: Photo by Jaime Incer, 1981.
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