THE ESTIMATION OF THE S-WAVE VELOCITY STRUCTURE BY MICROTREMOR OBSERVATIONS ON THE SUWA BASIN

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  • 諏訪盆地における常時微動観測によるS波速度構造の推定
  • スワ ボンチ ニ オケル ジョウジ ビドウ カンソク ニ ヨル Sハ ソクド コウゾウ ノ スイテイ

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Abstract

The purpose of this study is to obtain the S-wave velocity structure of Suwa basin. Array observations of microtremors were done at five sites in Suwa basin. The SPAC method was applied to the array observation results and the S-wave velocity structure from the ground surface to the seismic bedrock was obtained by surface wave inversion. Microtremor H/V spectra were also obtained at forty two sites in the basin. The S-wave velocities of shallower parts of the ground were obtained by the H/V spectra analyses. Results of the observations are: (1) the depth of the seismic bedrock is 4.3km at the central part of the basin and from 2.7 to 3.3km at the edge, (2) the depth of the layer which S-wave velocity is 400m/s is about 130m at the central part of the basin and from 20 to 40m at the edge. As mentioned above, the underground structure of the basin is bowl-shape.

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