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Largest Underwater Volcanoes
Barren Island, Andaman Sea
Barren Island is an effusive as well as explosive stratovolcano in the Andaman Sea, northeastern Indian Ocean. It is the northernmost active volcano of the great Indonesian arc. The volcano is 3 km in diameter, has restricted public access, and no regular monitoring.
The volcano is known to have been active from 1787, when it produced basalt and basaltic andesite tephra and lava flows from a cinder cone located in a 2 km diameter caldera. The lavas flow into the sea through a breach in the caldera wall on the western side.
Barren Island is the only active volcano in the Indian Subcontinent, located 135 km east of Port Blair, in east Andaman Sea and is a part of Andaman Nicobar chain of islands in the Indian Ocean. The Barren Island lies on the inner arc extending between Sumatra and Myanmar. The volcano consists of a caldera open towards the west, with a central polygenetic vent enclosing at least 5 nested tuff cones.
