English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27228/39071
Visitors : 2412629      Online Users : 61
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40548

Title: Geological Variation in S-wave Velocity Structures in Northern Taiwan and Implications for Seismic Hazards Based on Ambient Noise Analysis
Authors: Wen-Yen Chang
Bor-Shouh Huang
Ya-Chuan Lai
Yu-Chih Huang
Huajian Yao
Ruey-Der Hwang
Yi-Ling Huang
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Group velocity
Ambient noise
Empirical Green’s function (EGF)
Rayleigh wave
Date: 2014-12
Issue Date: 2017-01-19T08:05:56Z
Publisher: Journal of Asian Earth Sciences
Abstract: Abstract: Ambient noise analysis in Northern Taiwan revealed obvious lateral variations related to major geological units. The empirical Green’s functions extracted from interstation ambient noise were regarded as Rayleigh waves, from which we analyzed the group velocities for period from 3 to 6 s. According to geological features, we divided Northern Taiwan into seven subregions, for which regionalized group velocities were derived by using the pure-path method. On average, the group velocities in mountain areas were higher than those in the plain areas. We subsequently inverted the S-wave velocity structure for each subregion down to 6 km in depth. Following the analysis, we proposed the first models of geology-dependent shallow S-wave structures in Northern Taiwan. Overall, the velocity increased substantially from west to east; specifically, the mountain areas, composed of metamorphic rocks, exhibited higher velocities than did the coastal plain and basin, which consist of soft sediment. At a shallow depth, the Western Coastal Plain, Taipei Basin, and Ilan Plain displayed a larger velocity gradient than did other regions. At the top 3 km of the model, the average velocity gradient was 0.39 km/s per km for the Western Coastal Plain and 0.15 km/s per km for the Central Range. These S-wave velocity models with large velocity gradients caused the seismic waves to become trapped easily in strata and, thus, the ground motion was amplified. The regionalized S-wave velocity models derived from ambient noises can provide useful information regarding seismic wave propagation and for assessing seismic hazards in Northern Taiwan.
Relation: 96
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40548
Appears in Collections:[應用地球科學研究所] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML48View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback