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Unnamed submarine volcano

Tofua Arc at 18.3°S

Stratovolcano · Tonga · 40m (submarine)

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Type
Stratovolcano
Country
Tonga
Region
Tonga-Kermadec Volcanic Regions / Tofua Volcanic Arc
Elevation
40m (submarine)
Coordinates
-18.325, -174.365
Last eruption
2019
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Dacite
Geological summary

A submarine volcano along the Tofua Volcanic Arc ~45 km NW of Vava'u Island was first observed in September 2001, ~35 km S of Fonualei and 60 km NE of Late volcano. The site of the eruption is at a bathymetric depth of ~300 m. T-phase waves were recorded on 27-28 September 2001, and on the 27th local fishermen observed an ash-rich eruption column that rose above the ocean surface. No eruptive activity was reported after the 28th, but water discoloration was documented the following month. In early November rafts and strandings of dacitic pumice were reported along the coasts of Kadavu and Viti Levu in Fiji. The depth of the summit of the submarine cone following the eruption was determined to be 40 m during a 2007 survey; the crater of the 2001 eruption was open to the E.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
2001~2003 · 1 eruptions · max VEI 22017~2019 · 1 eruptions · max VEI 320012005201020142017

Detailed timeline

  1. 2019VEI 3Observed
    2019-08-06 – 2019-08-08
  2. 2001VEI 2Observed
    2001-09-27 – 2001-09-28

External links

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