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CoAxial Segment

Frattura eruttiva · Undersea Features · 2400 m (sottomarino)

During a 1993 ROPOS ROV (Remotely Operated Vehicle) dive on the CoAxial Segment along the Juan de Fuca Ridge a new lava flow was discovered on the sea floor. It was still hot and venting warm water (up to 50°C), and was 2.5 km long and 300 m wide. Bright yellow sediment patches indicated the presence of iron-reducing bacteria in the vent fluids. The CoAxial segment is located about 435 km W of the Oregon coast, NE of Axial volcano.
During a 1993 ROPOS ROV (Remotely Operated Vehicle) dive on the CoAxial Segment along the Juan de Fuca Ridge a new lava flow was discovered on the sea floor. It was still hot and venting warm water (up to 50°C), and was 2.5 km long and 300 m wide. Bright yellow sediment patches indicated the presence of iron-reducing bacteria in the vent fluids. The CoAxial segment is located about 435 km W of the Oregon coast, NE of Axial volcano. · Foto: Image courtesy of National Oceanic and Atmospheric Administration (http://www.pmel.noaa.gov/vents/home.html).
Tipo
Frattura eruttiva
Paese
Undersea Features
Regione
Eastern Pacific Volcanic Regions / Northeast Pacific Rifts Volcanic Province
Altitudine
2400 m (sottomarino)
Coordinate
46.520, -129.580
Ultima eruzione
1993
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Cluster
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The CoAxial segment of the Juan de Fuca Ridge is about 435 km W of the Oregon coast, NE of Axial volcano. A submarine eruption along the CoAxial segment that produced thermal plumes and a new lava flow was detected by acoustic hydrophones in June 1993, just days after installation of the hydrophone system. This was the first deep-sea volcanic eruption detected as it was happening. The location of the eruption was at a depth of about 2,400 m, about 37 km NE of Axial volcano. Bathymetric surveys indicated that one or more additional sea-floor lava extrusions took place immediately east of the 1993 lava flow sometime between 1981-82 and 1991.

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
1986~1987 · 1 eruzioni · VEI max. 01992~1993 · 1 eruzioni · VEI max. 019861987199019911992

Cronologia dettagliata

  1. 1993VEI 0Osservata
    1993-06-26 – 1993-07-04
    N end CoAxial segment, Juan de Fuca Ridge
  2. 1986 (±5 anni)VEI 0Osservata
    1986-07-02 – In corso
    CoAxial segment, Juan de Fuca Ridge

Link esterni

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