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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (11): 9-    DOI: 10.1631/jzus.2006.A1856
    
Study on the applicability of frequency spectrum of micro-tremor and dynamic characteristics of surface ground in Asia area
CHE Ai-lan, IWATATE Takahiro, ODA Yoshiya, GE Xiu-run
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; Department of Civil and Environmental Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan; Department of Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Abstract  The dynamic characteristics of ground soil using micro-tremor observation in Asia (Zushi and Ogasawara (Japan), Xi’an (China), Manila (Philippines), and Gujarat (India)) are studied. Ground micro-tremor signals were observed and analyzed by fast Fourier transform method (FFT). The response of ground soil to frequency of ground micro-tremor is revealed, and functions with frequency-dependence and frequency-selection of micro-tremor for different foundation soil strata are also researched. The horizontal to vertical spectral ratio (H/V, Nakamura technique) of micro-tremor observed at the surface ground was used to evaluate the site’s predominant period. This paper also discusses the application of micro-tremor on site safety evaluation, and gives the observed calculation results obtained at multiple points. The experimental foundation and the deduction process of the method are described in detail. Some problems of the method are pointed out. Potential use of the technique’s good expandable nature makes it a useable means for preventing and reducing disaster’s harmful effects.

Key words： Micro-tremor observation      Nakamura method      Predominant period      Earthquake observation      Spectral analysis     
Received: 20 December 2005     
CLC:  TU4  
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CHE Ai-lan
IWATATE Takahiro
ODA Yoshiya
GE Xiu-run
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CHE Ai-lan, IWATATE Takahiro, ODA Yoshiya, GE Xiu-run. Study on the applicability of frequency spectrum of micro-tremor and dynamic characteristics of surface ground in Asia area. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(11): 9-.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.A1856     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/I11/9

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