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Iyang-Argapura and Ijen Volcano Complexes, Java, Indonesia – December 17th, 2011

7.9S 113.5E

December 17th, 2011 Category: Image of the day, Volcanoes

Indonesia - December 11th, 2011

This orthorectified wide-swath ASAR image shows several volcanoes on the island of Java, Indonesia. Visible near the center of the island is Iyang-Argapura, a massive volcanic complex that dominates the landscape between Mount Raung and Mount Lamongan. Valleys up to 1,000 m deep dissect the strongly eroded Iyang volcano.

Visible on the east end of the island is the Ijen volcano complex, a group of stratovolcanoes. It is inside a larger caldera Ijen, which is about 20 kilometers wide. The Gunung Merapi stratovolcano is the highest point of that complex. West of Gunung Merapi is the Ijen volcano, which has a one-kilometer-wide acid crater lake.

Many other post-caldera cones and craters are located within the caldera or along its rim. The largest concentration of post-caldera cones forms an east/west-trending zone across the southern side of the caldera. The active crater at Kawah Ijen has an equivalent radius of 361 metres (1,184 ft), a surface of 0.41 square kilometres (0.16 sq mi). It is 200 metres (660 ft) deep and has a volume of 36 cubic hectometres (29,000 acre·ft).

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