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Sakar Island

Sakar

Stratovolkan · Papua New Guinea · 947 m

The small circular island at the top-center is Sakar, the NE-most of a chain of volcanic islands off the northern coast of Papua New Guinea. The 8 x 10 km wide island, seen in this Space Shuttle image with north to the upper left, is an incised stratovolcano with a summit crater lake. The 50-km-wide island of Umboi, whose left side is cut by a large caldera breached to the NE, fills the center of the image.
The small circular island at the top-center is Sakar, the NE-most of a chain of volcanic islands off the northern coast of Papua New Guinea. The 8 x 10 km wide island, seen in this Space Shuttle image with north to the upper left, is an incised stratovolcano with a summit crater lake. The 50-km-wide island of Umboi, whose left side is cut by a large caldera breached to the NE, fills the center of the image. · Foto: NASA Space Shuttle image STS50-100-D, 1992 (http://eol.jsc.nasa.gov/). · Wikimedia Commons
Tipe
Stratovolkan
Negara
Papua New Guinea
Wilayah
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Ketinggian
947 m
Koordinat
-5.410, 148.084
Letusan terakhir
Tidak diketahui
Kondisi tektonik
Subduction zone / Continental crust (> 25 km)
Bentuk lahan
Composite
Batuan utama
Basalt / Picro-Basalt
Ringkasan geologi

Sakar is an incised stratovolcano with a summit crater lake. Deep valleys cut the flanks of the volcano, which is partially surrounded by coral reefs. An older volcano that forms much of the island consists mainly of porphyritic basaltic rocks. A younger andesitic cone with a 1.5-km-wide crater has been constructed within the larger old crater, whose rim is exposed on the N and E. No eruptions have been reported, but warm springs are found along the SW coast, and a pyroclastic cone on the southern flank of the 8 x 10 km island may be of Holocene age (Johnson, 1990 pers. comm.). A large submarine debris-avalanche deposit lies north of Sakar.

Ringkasan Wikipedia

Ringkasan Inggris

Sakar Island is a volcanic island north-west of New Britain in the Bismarck Sea, at 5.416667°S 148.1°E. It is a stratovolcano with a summit crater lake. No recorded eruptions are known.

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