The late-Pleistocene to Holocene Callaqui stratovolcano has a profile of an overturned canoe, due to its construction along an 11-km-long, SW-NE fissure above a 1.2-0.3 million year old Pleistocene edifice. The ice-capped, basaltic-andesite volcano contains well-preserved cones and lava flows, which have traveled up to 14 km. Small craters 100-500 m in diameter are primarily found along a fissure extending down the SW flank. Intense solfataric activity occurs at the southern portion of the summit; in 1966 and 1978, red glow was observed in fumarolic areas (Moreno 1985, pers. comm.). Periods of intense fumarolic activity have dominated; few historical eruptions are known. An explosive eruption was reported in 1751, there were uncertain accounts of eruptions in 1864 and 1937, and a small phreatic ash emission was noted in 1980.
The ice-capped, 3164-m-high Callaqui volcano has an elongated profile due to construction along an 11-km-long, SW-NE-trending fissure. As many as 16 well-preserved volcanic craters, the majority of which are on the SW flank, have erupted along this fissure and produced lava flows that mantle the volcano's flanks. Two large, ice-filled craters are located at the summit, and intense solfataric activity occurs on the southern side.
Photo by Oscar González-Ferrán (University of Chile).
Last updated 2019-11-12 22:00:03