Alamagan is an island in the Northern Mariana Islands in the Pacific Ocean, 30 kilometres (16 nmi) north of Guguan, 250 kilometres (135 nmi) north of Saipan, and 60 kilometres (32 nmi) south of Pagan. It is currently undergoing resettlement since 2018, with a few people living there.

Alamagan is the emergent summit of a large stratovolcano in the central Mariana Islands with a roughly 350-m-deep summit crater east of the center of the island. The exposed cone is largely Holocene in age. A 1.6 x 1 km graben cuts the SW flank.

Alamagan is the emergent summit of a large stratovolcano in the central Mariana Islands with a roughly 350-m-deep summit crater east of the center of the island. The exposed cone is largely Holocene in age. A 1.6 x 1 km graben cuts the SW flank.

May 3, 2010 · Alamagan is a stratovolcano about 30 km south of the island of Pagan. Two historic eruptions are suspected in 1864 and 1887. Photograph by Norm Banks, U.S. Geological Survey, May, 1981.

Oct 13, 2020 · Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene.

Oct 13, 2020 · Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene.

Jun 5, 2024 · Alamagan is the emergent summit of a large stratovolcano in the central Mariana Islands with a roughly 350-m-deep summit crater east of the center of the island. The exposed cone is largely Holocene in age. A 1.6 x 1 km graben cuts the SW flank.

Aug 14, 2020 · Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene.

Alamagan is the emergent summit of a large stratovolcano in the central Mariana Islands with a roughly 350-m-deep summit crater east of the center of the island. The exposed cone is largely Holocene in age.

Alamagan is monitored by the USGS Alaska Volcano Observatory.