北海道北東部における爆破地震動の観測

概要

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A seismic refraction experiment with 75 seismometers and 4 explosions (J-1 to J-4) was carried out in the northeastern part of the Hokkaido on July 24, 2000. A 162-km profile extended in the NNW-SSE direction. The profile was geologically located above the Tokoro belt to investigate the deep structure of the back arc of the Kurile Arc and its relation with geothermal gradient. We only measured a one-direction shot. High-quality records were obtained along the profile for J-l and J-4 shots. The large fluctuation among the first arrivals at each station strongly suggests the existence of a very complicated sedimentary layer at the surface. We could estimate the depth of the upper surface of the lower crust and Moho discontinuity, and the surface sedimentary layer was proved to be thin (0.5 km) in the Tokoro belt.
東京大学の論文