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The generally symmetrical volcano is modified by the sharp-peaked Ventorrillo on the NW, a remnant of an earlier volcano. At least three previous major cones were destroyed by gravitational failure during the Pleistocene, producing massive debris-avalanche deposits south of the volcano. The modern cone was constructed in two stages. Frequent historical eruptions have been recorded since the beginning of the Spanish era. Activity in 1920-22 produced intermittent explosive eruptions and a small lava plug in the summit crater.