VALUATION FOR PRACTICAL USE OF S-WAVE VELOCITY STRUCTURE DETERMINED BY THE SPATIAL AUTO-CORRELATION METHOD APPLIED FOR MICROTREMORS

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  • 微動を用いた空間自己相関法によるS波速度構造の実務利用への評価
  • ビドウ オ モチイタ クウカン ジコ ソウカンホウ ニ ヨル Sハ ソクド コウゾウ ノ ジツム リヨウ エ ノ ヒョウカ

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Abstract

The SPatial Auto-Correlation (SPAC) method applied for array records of microtremors provides a S-wave velocity structure by surface wave inversion with sufficient accuracy. The efficiency of the SPAC method has mostly been verified for relatively deep underground structures as a tool of geophysical prospecting. However, efforts to increase its accuracy and develop the tools for measurements and analysis are still necessary for extending and applying the method in practical engineering use, especially for determining shallow velocity structures. We carried out array measurements of microtremors at 7 sites around Kanto area in Japan, where strong-motion stations have already been installed and the underground structures have been determined by other methods, such as PS logging and/or reflection survey. Through the comparison of S-wave velocity structures by various methods, we can conclude that the SPAC method has sufficient precision in practical engineering use.

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