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Banua Wuhu

Complex volcano · Indonesia · 5m (submarine)

Banua Wuhu
· Wikimedia Commons
Type
Complex volcano
Country
Indonesia
Region
Western Pacific Volcanic Regions / Sangihe Volcanic Arc
Elevation
5m (submarine)
Coordinates
3.146, 125.442
Last eruption
1919
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The submarine Banua Wuhu volcanic cone lies ~600 m off the western coast of Mahengatang Island, the emergent summit of a large submarine edifice, in the Sangihe Islands. Several ephemeral islands were constructed during the 19th and 20th centuries. An island 90 m high was formed in 1835, but had eroded to only a few rocks by 1848. Another island formed in 1889 was 50 m high in 1894. Five craters were reported during an eruption that built an island in 1904. An island that formed in 1919 had disappeared by 1935. Bathymetry shows shallow water over an area larger than Mahengatang Island towards the W (Haryanto, 2020). Satellite imagery frequently shows two sources of discolored water in the area, and it is a popular location for divers, who report sulfur odors and bubbling.

From Wikipedia

Banua Wuhu is a submarine volcano that rises more than 400 m (1,300 ft) from the sea floor in the Sangihe Islands of Indonesia. Historical records show that several ephemeral islands were formed and disappeared. A 90 m (300 ft) high island was formed in 1835, but then dwindled to only a few rocks in 1848. A new island was reportedly formed in 1889 and it was 50 m (160 ft) high in 1894. Another new island was formed in 1919 but then disappeared by 1935.

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Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1835~1848 · 1 eruptions · max VEI 21888~1902 · 2 eruptions · max VEI 21902~1915 · 2 eruptions · max VEI 21915~1928 · 1 eruptions · max VEI 31955~1968 · 1 eruptions · max VEI 018351862190219281955

Detailed timeline

  1. 1968VEI 0Geological estimate
    1968-09-05 – 1968-09-09
  2. 1918VEI 3Observed
    1918-07-18 – 1919-12-01
  3. 1904VEI 2Observed
    1904-04-17 – 1904-04-18
  4. 1904VEI 2Observed
    1904-08-27 – Ongoing
  5. 1895VEI 2Observed
    1895-07 – 1895-12-26
  6. 1889VEI 2Observed
    1889-09-06 – 1889-09-09
  7. 1835VEI 2Observed
    1835-04-23 – 1835-04-26

External links

⚠ For reference only. Not for emergency response.