Geologic Background:
Guallatiri, one of northern Chile's most active
volcanoes, is a symmetrical ice-clad volcano at the S end
of the Nevados de Quimsachata volcano group. Guallatiri
is capped by a central dacitic dome or lava complex, with
the active vent situated at its southern side. Thick lava
flows are prominent on the lower flanks.
Historic Activity:
- Eruptions have occurred in 1825, 1913, 1959, and
1960.
- Minor explosive eruptions have been reported from
Guallatiri since the beginning of the 19th century.
Intense fumarolic activity continues.
Recent Activity:
- In December 1987 vigorous fumarolic activity was
observed above the volcano's central dacitic dome.
- Similar activity was reported in December 1985 and
November 1990.
- Quiet emissions of white vapor were observed in July
1996.
Data Sources:
- Smithsonian's SEAN Bulletin (V. 10, No. 11 and V. 12,
No. 12)
- Global Volcanism Network (V. 16, No. 5 and V. 21, No.
7).
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