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Alamagan

Stratovulcano · 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
Tipo
Stratovulcano
Paese
United States
Regione
Pacifico nord-occidentale / Mariana Volcanic Arc
Altitudine
744 m
Coordinate
17.600, 145.830
Ultima eruzione
870
Contesto tettonico
Subduction zone / Crustal thickness unknown
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

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).

Sintesi da Wikipedia

Riassunto in inglese

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.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
540~675 · 1 eruzioni · VEI max. ?809~944 · 1 eruzioni · VEI max. 41752~1887 · 2 eruzioni · VEI max. ?540809121414831752

Cronologia dettagliata

  1. 1887VEI ?Stima geologica
    1887-11-29 – In corso
  2. 1864VEI ?Stima geologica
    1864-01-16 – In corso
  3. 870 (±100 anni)VEI 4Stima geologica
    870 – In corso
  4. 540 (±75 anni)VEI ?Stima geologica
    540 – In corso

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.