Anatahan
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Stratovolcano
A volcano composed of both lava flows and pyroclastic material.
Alaid
Alaid, a stratovolcano, has erupted at least ten times since 1790.
The most recent eruption was in 1986. The 1790-1793 and 1981 eruptions were large (VEI=4).
The plume from the 1981 eruption reached heights of about 7 miles (12 km) and was observed by satellites.
Alaid erupted again in December of 1996.