Geologic Background:
A 15-km-long E-W ridge forming the border
between Chile and Bolivia is comprised of several
stratovolcanoes with Holocene lava flows. Volcan Olca is
flanked on the west by Cerro Michincha and on the east by
Volcan Paruma, which is immediately west of the higher
pre-Holocene Cerro Paruma volcano. Volcan Paruma has been
the source of conspicuous fresh lava flows, one of which
extends 7 km to the SE. Volcan Paruma has displayed
persistent fumarolic activity in recent years.
Historic Activity:
- The only known historical activity from the
Olca-Paruma complex was a flank eruption of unspecified
character between 1865 and 1867.
Recent Activity:
Data Sources:
- Global Volcanism Network (V. 15, No. 3).
|