The island is an active volcano which has erupted several times during the modern period, including 24 December 1933, when several people were killed when lava masses buried several villages. In 1980, multiple explosion craters appeared along an north-south fissure on the slope east of Shindake. Shindake erupted again on 4 August 2014, generating a pyroclastic flow, but with no injuries or fatalities. The main crater erupted on the morning of 29 May 2015, prompting a level 5 alert level and the evacuation of the island.