Anatahan

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Anatahan,

uninhabited volcanic island, 12.5 sq mi (32 sq km), Saipan dist., Northern Mariana Islands, in the W Pacific Ocean some 85 mi (140 km) N of Saipan. The island is dominated by two overlapping calderas and two peaks that reach 2,343 ft (714 m) and 2,585 ft (788 m) high. No eruptions of the volcano were recorded in historical times until 2003, when an explosive eruption began in the smaller, eastern caldera.
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Swarms of seismic activity from the Anatahan volcano located on an uninhabited island started early on 31 March 2004, according to the US Geological Survey.