CRUSTAL STRUCTURE BENEATH THE AKASHI KAIKYO BRIDGE AS REVEALED BY EXPLOSION SEISMIC EXPERIMENTS

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  • 爆破による人工地震実験によって明らかにされた明石海峡大橋直下の地質構造
  • Crustal Structure Beneath the Akashi Ka

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Abstract

A series of explosion seismic experiments were conducted along the 1995 Keihoku-Seidan Profile. Most of the records acquired at the foundations of the Akashi Kaikyo Bridge had very poor S/N ratios. However, the P-waves of the explosions could be successfully delected after enhancing the records. The P-wave velocity structure was subsequently derived by fitting the travel times. The shallow crustal structure beneath the bridge is composed of four layers, with P-wave velocities ranging from 5.2 to 6.0km/s. The structure derived here is an improvement to the shallow crustal structure revealed by previous explosion experiments done about thirty years ago.

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