South Ilan plain high-resolution 3-D S-wave velocity from ambient noise tomography

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Title:	South Ilan plain high-resolution 3-D S-wave velocity from ambient noise tomography
Authors:	陳伯飛;Chen, Kai-Xun;Chen, Po-Fei;Chen, Li-Wei;Yao, Huajian;Fang, Hongjian;Su, Po-Li
Contributors:	地球科學學院地球科學學系
Keywords:	Ambient noise;Ambient noise tomography;Anomalies;Deformation;Dense Texan array;High resolution;Inhomogeneous media;Instruments;Ray tracing;Rayleigh waves;Resolution;S-waves;Seismicity;Subduction;Subduction (geology);Subduction zones;The South Ilan Plain;Tomography;Velocity;Wave velocity
Date:	2016-06-01
Issue Date:	2026-04-23 11:45:47 (UTC+8)
Publisher:	Chinese Geoscience Union;Taiwan: 中華民國地球科學學會
Abstract:	摘要： The Ilan Plain in northeastern Taiwan is located at a pivotal point where the Ryukyu trench subduction zone, the northern Taiwan crustal stretching zone, and the ongoing arc-continent collision zone converge. In contrast to the North Ilan Plain, the South Ilan Plain exhibits a thin unconsolidated sedimentary layer with depths ranging from 0 - 1 km, high on-land seismicity and significant SE movements relative to Penghu island. We deployed a dense network of 43 short-period vertical component Texan instruments from June to November 2013 in this study, covering most of the South Ilan Plain and its vicinity. We then used the ambient noise tomography method for simultaneous phase and group Rayleigh wave velocity measurements to invert a high-resolution 3-D S-wave for shallow structures (up to a depth of 2.5 km) in the South Ilan Plain. We used the fast marching method for ray tracing to deal with ray bending in an inhomogeneous medium. The resulting rays gradually bend toward high velocity zones with increasing number of iterations. The high velocity zone results are modified by more iterations and the resolutions become higher because ray crossings are proportional to ray densities for evenly distributed stations. The final results agreed well with known sedimentary basement thickness patterns. We observed nearly EW trending fast anomalies beneath the mountainous terrain abutting to the South Ilan Plain. The Chingshui location consistently exhibited a low S-wave velocity zone to a depth of 1.5 km. 出版者： Taiwan: 中華民國地球科學學會出版日期： 2016-06-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2016-06, Vol.27 (3), p.375-385 資源來源：華藝CEPS中文電子期刊服務版權： 2016. 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： EISSN: 1017-0839 識別號： DOI: 10.3319/TAO.2016.01.29.02(TEM)
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