Investigating near surface s-wave velocity properties using ambient noise in southwestern Taiwan

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Title:	Investigating near surface s-wave velocity properties using ambient noise in southwestern Taiwan
Authors:	郭俊翔;Kuo, Chun-Hsiang;Wen, Kuo-Liang;Lin, Che-Min;Wen, Strong;Huang, Jyun-Yan
Contributors:	地球科學學院地球科學學系
Keywords:	Ambient noise;atmospheric science;Bedrock;Earthquake engineering;Earthquakes;Engineering geology;Geological data;Geological mapping;geology;geophysics;hydrology;Instrumentation;Interfaces;Mountains;Noise;oceanic science;Plains;Profiles;Properties;S-waves;Sediments;Seismic activity;Seismic data;Seismic engineering;Seismic velocities;Seismological data;space science;Stations;Velocity;Velocity distribution;Velocity profiles;Wave velocity
Date:	2015-01-01
Issue Date:	2026-04-23 11:36:39 (UTC+8)
Publisher:	Chinese Geoscience Union;Taiwan: 中華民國地球科學學會
Abstract:	摘要： Ambient noise is typically used to estimate seismic site effects and velocity profiles instead of earthquake recordings, especially in areas with limited seismic data. The dominant Horizontal to Vertical Spectral Ratio (HVSR) frequency of ambi- ent noise is correlated to Vs30, which is the average S-wave velocity in the top 30 m. Vs30 is a widely used parameter for defining seismic amplification in earthquake engineering. HVSR can detect the vertical discontinuity of velocities, that is, the interfaces between hard bedrock and soft sediments. In southwestern Taiwan most strong motion stations are located in the plains and show a dominant frequency lower than 3 Hz. Several stations near the coast have low dominant frequencies of less than 1 Hz. The dominant frequencies are higher than 4 Hz at piedmont stations. The stations in the mountains with dominant frequencies over 8 Hz are typically located on very hard sites. This study analyzed the HVSR characteristics under different seismic site conditions considering the Vs30 from previous study (Kuo et al. 2012). The result implies that HVSRs are a better tool than Vs30 to classify the sites where bedrock is deeper than 30 m. Furthermore, we found a linear correlation between Vs30 and dominant HVSR frequency which could be used as a proxy of Vs30. The Vs30 map in this area was derived using the Engineering Geological Database for Taiwan Strong Motion Instrumentation Program (EGDT). The comparable distribu- tion pattern between the dominant frequency and Vs30 demonstrate that HVSR can recognize S-wave velocity properties at the shallow subsurface. 出版者： Taiwan: 中華民國地球科學學會出版日期： 2015-04-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2015-04, Vol.26 (2II), p.205-211 資源來源：華藝線上圖書館版權： 2015. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1017-0839 識別號： ISSN: 2223-8964 識別號： ISSN: 2311-7680 識別號： EISSN: 2311-7680 識別號： DOI: 10.3319/TAO.2014.12.02.05(EOSI)
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