| Study on the applicability of frequency spectrum of micro-tremor and dynamic characteristics of surface ground in Asia area |
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| 作者姓名： | CHE Ai-lan IWATATE Takahiro ODA Yoshiya GE Xiu-run |
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| 作者单位： | Department of Civil and Environmental Engineering Tokyo Metropolitan University Tokyo 192-0397 Japan，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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| 基金项目： | The authors thank Department of Civil Engineering, Manila＇s De La Salle University, and Xi＇an Jiaotong University, China, for cooperation and providing us useful data. Special thanks are extended to Professor Maohong Yu ofXi＇an Jiaotong University, Mr. Shigeo Aoki of Hokuto Institute and all the members of our group for their valuable assistance in micro-tremor measurements. |
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| 摘 要： | INTRODUCTION It is well known that micro-tremor observation is one of the most convenient methods for investi- gating the dynamic characteristics of the surface ground and the affected structure (Bard, 1998; Dow- rick, 1997). Micro-tremor is a kind of geophysics information related to soil formation of site, corre- sponding to engineering geological condition. The frequency characteristics of micro-tremor can be obtained by spectral analyses of its signals, which can be used to probe into…
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| 关 键 词： | 震动观测 Nakamura方法 卓越周期 地震观测 光谱分析地震 |
| 收稿时间： | 2005-12-20 |
| 修稿时间： | 2006-06-21 |
Study on the applicability of frequency spectrum of micro-tremor and dynamic characteristics of surface ground in Asia area |
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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[J].Journal of Zhejiang University Science,2006,7(11):1856-1863. |
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| Authors: | Ai-lan Che Takahiro Iwatate Yoshiya Oda Xiu-run Ge |
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| Institution: | (1) School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China;(2) Department of Civil and Environmental Engineering, Tokyo Metropolitan University, Tokyo 192-0397, Japan;(3) 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. |
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| Keywords: | Micro-tremor observation Nakamura method Predominant period Earthquake observation Spectral analysis |
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