Crustal Structure in the Northeastern Part of Shikoku, Japan as Derived from Seismic Observations of Sakaide-Itchu Explosions in 1980

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  • 1980年坂出・一宇爆破地震動観測による四国東北部の地殻構造
  • 1980ネン サカイデ イチウ バクハ ジシンドウ カンソク ニ ヨル シコク

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Abstract

Explosion seismic experiments were carried out in 1980 for the investigation of the crustal structure in the northeastern part of Shikoku. Sixty-three seismograms were obtained at 42 temporary stations aligned on the two N-S trending parallel profiles crossing the Median Tectonic Line which is the most prominent geotectonic line and the greatest active fault in Japan. A P-wave velocity structure of the surface and granitic layers was obtained from the first arrival time data. A structure of the deeper part of the crust was also roughly estimated from the later arrivals. The Median Tectonic Line was estimated to be a north-depressed fault with a vertical offset of up to 2km in the shallow velocity profile. A possibility of the extension of the offset further downward to the deeper crust is also suggested.

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