Geologic Background:
The small island of Guguan, only 2.8 km wide, is
composed of an eroded volcano on the south, a caldera
with a post-caldera cone, and a northern volcano. The
latter has three coalescing cones and a breached summit
crater that fed lava flows to the west and NW. The 287-m
high point of the island is the south rim of the caldera.
Historic Activity:
- The only known historical eruption of Guguan took
place between 1882 and 1884 and produced the northern
volcano and lava flows that reached the coast.
- Reports of a 1901 eruption have been
discredited.
Recent Activity:
Data Sources:
- Information from Global Volcanism Network (V. 17, No.
6)
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