Ceboruco Volcano - John Seach



21.12 N, 104.50 W
summit elevation 2280 m

Ceboruco Volcano is located in western Mexico. It is is a major composite volcano at the western end of the Mexican Volcanic Belt, near the junction between the North American and Pacific plates. The volcano is built from successive eruptions of andesite lavas and pyroclastic rocks, and major eruptions have created two concentric calderas, and three central cinder cones. Cone
construction has alternated with caldera formation.

Ceboruco volcano rises 1100 m above a well-defined flat floor, of a linear NW-SE trending volcano-tectonic depression. It is part of a chain of volcanic centres, running northwest parallel to the fault trends. The eruption centres consist of small basaltic andesite scoria cones, lava flows, and a few extrusive domes of more viscous lava.

Volcano building episodes at Ceboruco.
1) Construction of a simple conical volcano, composed of andesitic lavas and pyroclastic rocks.
2) Major caldera-forming eruption which produced the outer caldera.
3) Construction of a second simple cone, nested within the older caldera.
4) A second caldera-forming event produced an inner caldera, 1.3 kilometres in diameter.

About 1000 years ago the volcano erupted Jala Pumice which was the largest eruption in Mexico in the past 10,000 years. The eruption produced a 4 km wide caldera.

1870-1875 Eruption
An eruption of Ceboruco volcano began on 23rd February 1870. A 7.7 km long lava flow was extended from the crater along the Los Cuates Barranca over a two year period. From 20-28 March 1875 ash emissions reached 15 km altitude.

Ceboruco Volcano Eruptions

1870-75, 1567, 1542