火薬爆発によるS波検出の実験(4) : cratering shotによるSH波地下構造の解析

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In the previous paper, it was reported that phases of S waves were observed by ordinary explosions. One of the problems was to increase the S/N ratio of S waves. Therefore, source conditions were investigated. In the present paper, cratering shot was used as the SH wave source. Dynamite was buried near the surface and was exploded. Crater was produced on the surface after the explosion. So, this shot was named the cratering shot. Experiments for cratering shot were carried out as a theme of the co-operative experiment with members of the Seismic Exploration Group of Japan at Teine near Sapporo City in the summer of 1968. Seismic records of this shot were compared with the plate striking shot and the SH wave subsurface structure of the B span in the experimental field was analyzed by means of cratering shot. Waveforms with cratering shot were more monotonous than the plate striking shot and the features of the generation and transmission of LOVE waves was distinctly observed in records of the cratering shot. The correspondence of phases of SH waves of both methods was very good. The SH wave subsurface structure was decided by time-distance curves of phases of SH waves with two kinds of shots and was compared with the structure of the SH wave velocity log. Both structures were in agreement except low velocity layers. From the above results, it was concluded that the cratering shot method had the same ability of the SH wave source as the plate striking method, but the quantitative analyses were not satisfactory. Therefore, more experimental and theoretical investigation on the cratering shot will have to be continued.
帯広畜産大学の論文
1969-09-30

火薬爆発によるS波検出の実験(4) : cratering shotによるSH波地下構造の解析

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