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Ahyi

Stratovulcano · United States · 55 m (sottomarino)

Ahyi submarine volcano is seen in a bathymetric view looking from the NE with 2x vertical exaggeration. It rises to within about 150 m of the sea surface about 18 km SE of the island of Farallon de Pajaros (Uracas) in the northern Marianas. Water discoloration has been observed over the volcano and an explosive eruption was seismically detected in April 2001.
Ahyi submarine volcano is seen in a bathymetric view looking from the NE with 2x vertical exaggeration. It rises to within about 150 m of the sea surface about 18 km SE of the island of Farallon de Pajaros (Uracas) in the northern Marianas. Water discoloration has been observed over the volcano and an explosive eruption was seismically detected in April 2001. · Foto: Image courtesy of Susan Merle (Oregon State University/NOAA Vents Program).
Tipo
Stratovulcano
Paese
United States
Regione
Northwestern Pacific Volcanic Regions / Mariana Volcanic Arc
Altitudine
55 m (sottomarino)
Coordinate
20.437, 145.030
Ultima eruzione
2026
Contesto tettonico
Subduction zone / Crustal thickness unknown
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Ahyi seamount is a large conical submarine volcano ~18 km SE of the island of Farallon de Pajaros in the northern Marianas. Water discoloration has been observed there, and in 1979 the crew of a fishing boat felt shocks over the summit area, followed by upwelling of sulfur-bearing water. On 24-25 April 2001 an explosive eruption was detected seismically by a station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+/- 15 km) at a location near the southern base of Ahyi. An eruption in April-May 2014 was detected by NOAA divers, hydroacoustic sensors, and seismic stations.

Sintesi da Wikipedia

Riassunto in inglese

Ahyi Seamount is an active shallow submarine volcano in the Northern Mariana Islands, in the Northwestern Pacific Ocean. It has erupted 5 times since the year 2000: in 2001, 2014, 2022–23, and twice in 2024. Since 2009, it has been a part of Marianas Trench Marine National Monument of the United States.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1934~1943 · 1 eruzioni · VEI max. 11961~1970 · 2 eruzioni · VEI max. 01970~1980 · 1 eruzioni · VEI max. 01980~1989 · 1 eruzioni · VEI max. 01989~1998 · 2 eruzioni · VEI max. 01998~2007 · 1 eruzioni · VEI max. 02007~2016 · 1 eruzioni · VEI max. 22016~2025 · 4 eruzioni · VEI max. 119341952198019982016

Cronologia dettagliata

  1. 2025VEI ?Osservata
    2025-10-20 – 2026-01-09
  2. 2024VEI 0Osservata
    2024-01-01 – 2024-03-27
  3. 2024VEI 0Osservata
    2024-08-05 – 2025-05-28
  4. 2022VEI 1Osservata
    2022-11-18 – 2023-06-11
  5. 2014VEI 2Osservata
    2014-04-24 – 2014-05-17
    Summit crater and SE slope
  6. 2001VEI 0Osservata
    2001-04-24 – 2001-04-25
    S of Ahyi (20.34 N, 145.02 E)
  7. 1994VEI 0Osservata
    1994-04-23 – In corso
  8. 1989VEI 0Osservata
    1989-09-21 – 1989-12-27
    SW of Ahyi (~20.3 N, 144.9 E)
  9. 1985VEI 0Osservata
    1985-08-02 – 1985-09-05
    SW of Ahyi
  10. 1979VEI 0Osservata
    1979-11-15 – 1979-11-15
    Near the Ahyi summit
  11. 1969VEI 0Osservata
    1969-03-11 – 1969-03-13
    S of Ahyi (20.24 N, 145.02 E)
  12. 1967VEI 0Osservata
    1967-03-27 – 1967-04-10
    SW of Farallon de Pájaros
  13. 1934VEI 1Osservata
    1934-07-15 – In corso
    Vicinity of Farallon de Pájaros

Link esterni

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