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Anatahan
Anatahan is an island in the Northern Mariana Islands in the Pacific Ocean, and has one of the most active volcanoes of the archipelago. Formerly inhabited, the island currently does not have any population due to the always-present danger of volcanic eruptions. Anatahan is located northwest of Farallon de Medinilla and north of Saipan.
==Geography==
Anatahan is roughly elliptical in shape, with a length of and a width of and an area of .〔Brainard, ''(Coral reef ecosystem monitoring report )'', S. 1〕 The island is the summit of stratovolcano which reaches an altitude of above sea level at its highest peak.
The volcano is topped by a caldera, wide, which is divided into an eastern and western portion, with the eastern portion around lower than the western. Sparseness of vegetation in the most recent lava flows on Anatahan indicated that they were of Holocene age. In April 1990, the inhabitants of the western coast of the island were evacuated after earthquake swarms and active fumaroles indicated that an eruption might be imminent, but no eruption occurred at that time. Further earthquake swarm occurred in May 1992. The first historical eruption of Anatahan occurred in May 2003, when a large explosive eruption with a VEI of 4 took place forming a new crater inside the eastern caldera and causing an ash plume high which impaired air traffic to Saipan and Guam.〔(''Local earthquakes and strong thermal activity; youngest surge deposits appear no more than a few hundred years old.'' ) Monatsbericht 04/1990 im ''Global Volcanism Program''.〕
The most recent eruption was in 2007, and lasted until 2008.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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