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Alamagan

Stratovolkan · United States · 744 m

Alamagan, seen here from the W with two peaks on either side of a roughly 350-m-deep summit crater, is the emergent summit of a large submarine volcano. The exposed cone is largely Holocene in age and the SW flank contains a 1 x 1.6 km graben. Pyroclastic flow deposits have been dated at about 1,000 years old.
Alamagan, seen here from the W with two peaks on either side of a roughly 350-m-deep summit crater, is the emergent summit of a large submarine volcano. The exposed cone is largely Holocene in age and the SW flank contains a 1 x 1.6 km graben. Pyroclastic flow deposits have been dated at about 1,000 years old. · Foto: Photo by Norm Banks, 1981 (U.S. Geological Survey). · Wikimedia Commons
Tipe
Stratovolkan
Negara
United States
Wilayah
Pasifik Barat Laut / Mariana Volcanic Arc
Ketinggian
744 m
Koordinat
17.600, 145.830
Letusan terakhir
870
Kondisi tektonik
Subduction zone / Crustal thickness unknown
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

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. An extensive basaltic andesite lava flow has extended the northern coast of the island, and a lava platform also occurs on the S flank. Pyroclastic-flow deposits erupted about 1000 years ago have been dated, but reports of historical eruptions were considered invalid (Moore and Trusdell, 1993).

Ringkasan Wikipedia

Ringkasan Inggris

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. The project was coordinated by the Northern Islands Mayor's office and the people there have radio contact with the mainland.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
540~675 · 1 letusan · VEI maks. ?809~944 · 1 letusan · VEI maks. 41752~1887 · 2 letusan · VEI maks. ?540809121414831752

Garis waktu rinci

  1. 1887VEI ?Perkiraan geologi
    1887-11-29 – Berlangsung
  2. 1864VEI ?Perkiraan geologi
    1864-01-16 – Berlangsung
  3. 870 (±100 tahun)VEI 4Perkiraan geologi
    870 – Berlangsung
  4. 540 (±75 tahun)VEI ?Perkiraan geologi
    540 – Berlangsung

Tautan eksternal

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