Southern EPR-Segment J

Southern EPR at 18.2°S (Segment J)

割れ目火口 · Undersea Features · 2650m (海底)

Black smoker hydrothermal vents emitting high-chlorinity fluids were photographed at the "RM29" site at 18°10’S. This image was taken in November 1994 from the Japanese submersible Shinkai 6500. The axial crest of Segment J of the Southern East Pacific Rise consists of an asymmetrical shallow graben varying from 250 to 600 m wide with walls about 20 m high. · 写真: Image courtesy of NOAA Vents Program, 1994 (www.pmel.noaa.gov/vents/chemistry/images/).

タイプ: 割れ目火口
国: Undersea Features
地域: Southern Pacific Volcanic Regions / Southern East Pacific Rise Volcanic Province
標高: 2650m (海底)
座標: -18.175, -113.350
最終噴火: 1890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 axial crest of Segment J of the Southern East Pacific Rise consists of an asymmetrical shallow graben varying from 250 to 600 m wide with walls about 20 m high. Horst and graben structures expose cooled lava lakes and both active and extinct hydrothermal chimneys. Basaltic lava flow fields, lava pillars, and pillow mounds are found on the floor of the graben. The largest lava flow field is the Moai lava flow at about 18°12'S. Two lava flows have been dated by paleomagnetic evidence at about 1820 and 1890 CE.

噴火履歴

概要 (VEI時系列)

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詳細タイムライン

1890年VEI 0地質学的推定
1890 ~ 進行中
1820年VEI 0地質学的推定
1820 ~ 進行中

外部リンク

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