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CoAxial Segment

割れ目火口 · Undersea Features · 2400m (海底)

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. · 写真: Image courtesy of National Oceanic and Atmospheric Administration (http://www.pmel.noaa.gov/vents/home.html).
タイプ
割れ目火口
国
Undersea Features
地域
Eastern Pacific Volcanic Regions / Northeast Pacific Rifts Volcanic Province
標高
2400m (海底)
座標
46.520, -129.580
最終噴火
1993年
テクトニクス環境
Rift zone / Oceanic crust (< 15 km)
火山地形
Cluster
主要岩石
Basalt / Picro-Basalt
地質学的概要

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.

噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
1986~1987 · 1件 · 最大 VEI 01992~1993 · 1件 · 最大 VEI 019861987199019911992

詳細タイムライン

  1. 1993年VEI 0観測記録
    1993-06-26 ~ 1993-07-04
    N end CoAxial segment, Juan de Fuca Ridge
  2. 1986年 (±5年)VEI 0観測記録
    1986-07-02 ~ 進行中
    CoAxial segment, Juan de Fuca Ridge

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。