The tree-covered hills in the foreground and center of this view from the summit of Jocotitlán volcano were formed during a massive debris avalanche produced by collapse of the volcano about 9,700 years ago. The debris avalanche deposit includes several conical hummocks (such as those to the lower left) and large transverse ridges up to 2.7 km long. The avalanche traveled a maximum distance of 12 km to the NE and covered an area of 80 km².

Photo by Hugo Delgado-Granados, (Universidad Nacional Autónoma de México).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Keywords: hummock | debris avalanche deposit

Jocotitlán