"Volcán Ceboruco is the only historically active volcano in the NW part of the Mexican Volcanic Belt. The complex stratovolcano rises above the floor of the Tepic graben and is truncated by two concentric summit calderas. Eruption of the voluminous rhyodacitic Jala Pumice, the largest known in México during the Holocene, formed the initial 4-km-wide caldera about 1000 years ago. The second caldera, 1.5 km wide, was formed by collapse of part of the large Dos Equis dacitic lava dome, which partly filled the earlier caldera. About 15 basaltic and andesitic cinder cones and lava flows have erupted along a NW-SE-trending line cutting across Ceboruco. The massive, sparsely vegetated El Norte lava flow, probably erupted in the past few hundred years, blankets the entire northern flank of the volcano. The last eruption of Ceboruco took place during 1870-75. Explosive eruptions from a vent on the upper west flank accompanied extrusion of a 1.1 cu km dacitic lava flow that covers a large area on the lower western flank."  -Smithsonian Volcano Archive
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