When a permanent island was formed. Didicas now consists of a small, 244-m-high andesitic lava dome about 1.4 km in longest exposed dimension. A 400-m-wide crater was formed during the 1952 eruption. The first recorded submarine eruption of Didicas was in 1773. The first recorded subaerial cone reached a height of 213 m in 1860, after a four-year-long eruption, but soon was eroded beneath the sea. Three rock masses up to 82 m high were left after an eruption in 1900. Two eruptions have occurred since 1952 at an explosion crater on the northern side of the island.
Didicas was initially a submarine volcano, and is classified as a dome volcano with an elevation of 228 meters and a base diameter of 1,200 meters at sea level.
Didicas has erupted in 1773, 1856-1857, 1900, 1952, 1969, 1978 (January 6-9), and 1990. It is one of the active volcanos in the Philippines which are all part of the Pacific ring of fire.
|The eruption of Didicas|
in March 1969 - June 1969
Flank (excentric) vent
Tsunami (giant sea waves)