Three-dimensional Vs model constructed from microtremor array measurement in Kushiro, Japan

Presenter: Cheng-Yi Lin
Date: 2013/10/3

Abstract

　　　　The S-wave velocity (Vs) profile is one of the key parameters for evaluating dynamic response characteristics of soil deposits. Microtremor is a low amplitude (in the order of micro metres) ambient vibration of the ground caused by man-made or atmospheric disturbances. The proposed microtremor technique consists of a single-station measurement using a three component sensor and simultaneous observation using array of sensors, hereafter called conventional and array measurements, respectively. In this topic conventional microtremor measurements were performed at 230 stations and six sites within Kushiro city. Three-dimensional Vs structure is then estimated from inversion of the H/V spectra with the Vs values determined from the microtremor array data. The estimated Vs profile is consistent with available velocity logs and results of subsequent borings, indicating the effectiveness of the proposed method.

 

Reference

• Arai H, Tokimatsu K, Abe A. Comparison of local amplifications estimated from microtremor f –k spectrum analysis with earthquake records. Proceedings of the 11th World Conference on Earthquake Engineering, Acapulco,Mexico, 1996; article no. 1486, CD-ROM.

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• Hiroshi Arai, Kohji Tokimatsu Three-dimensional VS profiling using microtremors in Kushiro, Japan.Earthquake Engng Struct. Dyn. 2008; 37:845–859 Published online 30 January 2008 in Wiley InterScience

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