After the first recorded eruption in 1787, further eruptions were recorded in 1789, 1795, 1803–04, and 1852. After nearly one and half century of dormancy, the island had another eruption in 1991 that lasted six months and caused considerable damage. There were eruptions in 1994–95 and 2005–07, the later being considered to be linked to the 2004 Indian Ocean earthquake. The most recent eruption started in May 2008 and still continues.
This volcanic island stands in the midst of a volcanic belt on the edge of the Indian and Burmese tectonic plates. Narcondum is a dormant volcano in the area, apart from volcanic seamounts like Alcock and Sewell.
All the historical and recent eruptions (1787 and after) are confined within and around an active polygenetic cinder cone in a 2 km wide caldera that is formed by the collapse of a primitive cone of a stratovolcano. The remnant of the primitive volcanic cone forms a precipitous cliff around the island (commonly referred as caldera wall), with a break towards the west. The highest elevation on the island is 354 metres (1,161 ft), with most of the primitive volcano underwater (standing on the seafloor 2250 meters below the sea level). The island is 3 km in diameter, with a total surface area of 10 km².
True to its name, it is a barren area uninhabited by humans, though it has a small population of goats. Also birds, bats like flying foxes and a few rodent species such as rats are known to survive the harsh conditions.
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