Geologic Background:
The Tanga Islands are the eroded remnants of a
Plio-Pleistocene stratovolcano whose summit was destroyed
by caldera collapse during the early Pleistocene.
Remnants of the caldera rim appear on Lif (283 m high),
Tefa (155 m high), and southern Malendok (472 m high)
islands. Bitlik and Bitbok islands are cumulodomes
constructed near the center of the caldera. The Tabar,
Lihir, Tanga, Feni Island chain north and east of New
Ireland has seen Holocene activity at Lihir, ~60 km NW of
Tanga. A large phreatomagmatic eruption formed a maar at
Ambitle Island in the Feni Group, ~60 km SE of Tanga
about 2,300 years ± 100 years ago.
Historic Activity:
Recent Activity:
- Reports of growth (uplift) of Lif Island.
- Warm springs.
Data Sources:
- Global Volcanism Network (V. 24, No. 10).
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