S-wave velocity structure and site effect parameters derived from microtremor arrays in the Western Plain of Taiwan

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Title:	S-wave velocity structure and site effect parameters derived from microtremor arrays in the Western Plain of Taiwan
Authors:	郭俊翔;Kuo, Chun-Hsiang;Chen, Chun-Te;Lin, Che-Min;Wen, Kuo-Liang;Huang, Jyun-Yan;Chang, Shun-Chiang
Contributors:	地球科學學院地球科學學系
Keywords:	HVSR;Microtremor array;Taiwan;Z1.0
Date:	2016-10-01
Issue Date:	2026-04-23 11:47:16 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： •Vs profiles extend to bedrocks of Vs larger than 1km/s at 45 sites are derived.•A two-stage inversion scheme for microtremor arrays is adopted.•Vs30, Z0.6, and Z1.0 contour maps for the Western Taiwan.•Developing a relationship between Vs30 and Z1.0 for Taiwan. In this study, microtremor array measurements were conducted at 45 sites in the Western Plain of Taiwan. The arrays were approximately 30m or 60m in radius, depending on the site. The maximum-likelihood frequency–wavenumber method was adopted to obtain the phase velocities of Rayleigh waves, and then a genetic algorithm technique based on an inversion scheme of the fundamental mode of the Rayleigh waves’ dispersion curves was applied to calculate a preliminary S-wave velocity (Vs) profile at each site. Because a layer of thick sediment covers the bedrock in the Western Plain of Taiwan, microtremor arrays in this size range cannot estimate the structure of the entire sediment. Therefore, this study implemented further inversion of the horizontal-to-vertical spectral ratios of the microtremors to estimate the deeper structures up to the bedrock of Vs greater than 1000m/s. Previously logged velocity profiles for different depths at or near our study sites were collected and compared with the Vs profiles derived from our microtremor array measurements; the results were found to be highly comparable. Therefore, we could delineate the depth distributions for the layer depths for Vs=600m/s and 1000m/s in this region. The depth for Vs=600m/s is approximately 50m in the piedmont area and approximately 300m at the coastline; moreover, the depths for Vs=1000m/s increase from 200m in the piedmont area to approximately 1000m at the coastline. The depths for Vs=1.0km/s (Z1.0), which is an important parameter that accounts for the basin effect in recent ground motion prediction equations, are consequently available at the study sites. The distribution of Z1.0 as a function of Vs30 indicates higher similarity to that in Japan than in the San Francisco Bay area. 出版者： Elsevier Ltd 出版日期： 2016-10-01 出處： Journal of Asian earth sciences, 2016-10, Vol.128, p.27-41 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2016 The Author(s) 識別號： ISSN: 1367-9120 識別號： ISSN: 1878-5786 識別號： EISSN: 1878-5786 識別號： DOI: 10.1016/j.jseaes.2016.07.012
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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