Quilotoa Volcano - John Seach

john

Ecuador

0.85 S, 78.90 W
summit elevation 3914 m
caldera

Quilotoa volcano is located about 80 km SSW of Quito. The volcano contains a 3 km wide caldera with steep walls which rise 400 m above the surface of a 250 m deep lake.

The eruption of Quilotoa Volcano in 1280 was one of the largest eruptions in the world in the past 1000 years. It has large explosive eruptions every 10,000-14,000 years.

The eruption of Quilotoa volcano in 1280 came after 14,000 years of dormancy. A Plinian eruption discharged ~11 cubic km of magma during four eruptive phases. The eruption ended with the formation of a small caldera and the extrusion of a small lava dome.

The origin of magma that produced the different pumice types at Quilotoa volcano is within the volcanic conduit, and not in the magma chamber as previously supposed for other large-scale explosive eruptions. Magma was produced by viscous heating and crystal grinding of the original white magma in a region close to
the conduit walls.

Quilotoa Volcano Eruptions

1797?, 1759?, 1740?, 1725?, 1150