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Lonquimay volcano

stratovolcano 2865 m / 9,399 ft
Central Chile and Argentina, South America, -38.38°S / -71.58°W
Current status: dormant (1 out of 5)
Lonquimay volcano books
Typical eruption style: explosive
Lonquimay volcano eruptions: 1988-90, 1940(?), 1933, 1887-90, 1853 No recent earthquakes
TimeMag. / DepthDistanceLocation
Lonquimay is a small symmetrical stratovolcano with a flat top in central Chile immediately SE of Tolguaca volcano. It contains a glacier in the summit crater and down on the south flank.
Lonquimay often erupts from flank vents and produces large lava flows.

Background:

Lonquimay volcano is dominantly andesitic, but contains also basaltic and dacitic rocks. Eruptions have occurred from both the summit crater and flank vents. A weakly defined fissure zone is aligned E-W.
A prominent NE-SW fissure cuts across the entire volcano and is known as the Cordón Fissural Oriental fissure zone. It extends 10 km to the NE has erupted from several flank vents and formed cinder cones. Some of these have erupted large lava flows in historical time, such as during 1887-90 and 1988-90. These flows traveled up to 10 km from their flank vents.
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Source: USGS/GVP

1988-90 flank eruption
After a repose interval of 100 years, Lonquimay volcano erupted again from a fissure vent on the NE flank on 25 December 1988.
The eruption lasted 13 months and built up a large new flank cone, dubbed Navidad ("Christmas"). It produced lava flows and large amounts of fluorine-bearing ash. The eruption caused one fatality, forced over 2000 people to be evacuated, killed hundreds of livestock and damaged farming in a wide area around the volcano. ...more

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