Report on DELP 1985 Cruises in the Japan Sea : Part II : Seismic Refraction Experiment Conducted in the Yamato Basin, Southeast Japan Sea

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概要

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• Refraction seismic study was designed to constrain the structure of the Yamato Basin, the southeastern part of the Japan Sea using 20 OBS's, five tons of explosives and airgun. The Yamato Basin has a steep velocity gradient in the upper part of the crust as commonly observed in the oceanic crust. The Moho depth is determined at around 18 km subsurface, which is nearly twice as deep as that of the normal oceanic crust. The apparent Pn velocity is 8.0-8.1 km/s along two azimuthal direction which were selected as being parallel to the min. and max. directions of the Pn anisotropy proposed by Okada et at. (1978).大和海盆下の地殻及び上部マントル構造を調べるために,高密度の屈折法地震探査を行なった.測線A(北東-南西方向,測線長230km)およびこれに直交する測線B(北西-南東方向,測線長130km)に20台の海底地震計を投入した.音源には154発の火薬発破(最大薬量500kg,総計5トン)を用い,さらに全測線上でエアガンをかけた.大和海盆の地殻は大きな速度勾配をもち,海洋性地殻に似た速度構造をもっている.しかし,モホ面の深さは約18kmで通常の海洋地殻の2倍近い厚さがあり,典型的な海洋地殻とも大陸性地殻とも言えない.従来報告されていたPn異方性の速度最大および最小方向に平行に配置したAB両測線で,Pnみかけ速度はともに8.0-8.1km/sであった.また,大和海盆に広く分布すると言われていた3.5km/s層は一部の観測点でしか観測されず,局所的にしか存在しないと考えられる.

• 東京大学地震研究所,Earthquake Research Institute, University of Tokyo,東京大学理学部,現在カリフォルニア大学ロスアンゼルス校,千葉大学理学部,神戸大学理学部,東京大学地震研究所の論文
• 1988-03-31

著者

• SUYEHIRO Kiyoshi

  IFREE, Japan Agency for Marine-Earth Science and Technology

• Katao H

  Kyoto Univ. Kyoto Jpn

• Hirata Naoshi

  Univ. Tokyo Tokyo Jpn

• Hirata Naoshi

  Department Of Earth Sciences Chiba University

• Hirata N

  Univ. Tokyo Tokyo Jpn

• Ouchi T

  Kobe Univ.

• Suyehiro Kiyoshi

  Ifree Japan Agency For Marine-earth Science And Technology

• Shimamura Kiyoshi

  Ifree Japan Agency For Marine-earth Science And Technology

• Nagumo S

  Univ. Hawaii

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