Geologic Background:
The Banua Wuhu submarine volcano in the
Sangihe Islands rises more than 400 m from the sea floor
to form a shoal less than 5 m below sea level. Several
ephemeral islands were constructed during the 19th and
20th centuries. It is located between Siau and Sangi
Islands, near Mahengeteng Island.
Historic Activity:
- At least 7 eruptions since 1835. Eruptions in 1835,
1889, 1895, 1904, 1904,1918 to 1919, and 1968.
- An island 90 m high was formed in 1835, but dwindled
to only a few rocks by 1848.
- A new island formed in 1889 was 50 m high in
1894.
- Five new craters were formed during an eruption that
built a new island in 1904.
- Another new island that formed in 1919 had
disappeared by 1935.
Recent Activity:
Data Sources:
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