Evaluation technique of the ground attenuation property by using a PS-logging method

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  • PS検層の手法を用いた地盤減衰特性 (Q値) の評価
  • PSケンソウ ノ シュホウ オ モチイタ ジバン ゲンスイ トクセイ(Qチ)ノ ヒョウカ

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Abstract

 The evaluation of the attenuation property by using a PS-logging technique, which uses an artificial source, was reported based on the case studies. The main benefits of this method are that it is a convenient, cost effective, and highly accurate system. An artificial source is set at the surface that generates seismic waves. These waves are then recorded by the borehole receivers, which were installed in the borehole with high density. The recorded signals are analyzed and the attenuation properties of each velocity layer are calculated in detail. This method can also evaluate attenuation properties as a function of frequencies. After showing an overview of the characteristics of the attenuation properties and the analysis method of using the PS-logging technique, we then show the case studies of the Q-value investigation, which are implemented at a hard rock and soft rock site. In these case studies, we showed results which were conducted by using a Vibrator as the source. The results of the investigation show that we can acquire data with high S/N and can evaluate the attenuation properties of each velocity layer in detail. We also showed that the Q-value, which was acquired using the PS-logging technique, contains the effect of wave- scattering caused by fractures in the rock. Evaluating attenuation properties through the PS-logging technique is useful in obtaining attenuation property in detail.<br>

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