Wu, Yih-Min and Chang, Chien-Hsin and Zhao, Li and Shyu, J. Bruce H. and Chen, Yue-Gau and Sieh, Kerry and Avouac, Jean-Philippe (2007) Seismic tomography of Taiwan: Improved constraints from a dense network of strong motion stations. Journal of Geophysical Research B, 112 (B8). Art. No. B08312. ISSN 0148-0227. http://resolver.caltech.edu/CaltechAUTHORS:20101115-101204985
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In this study, a large collection of 41,141 S-P times from the untapped records of the Taiwan Strong Motion Instrumentation Program (TSMIP) network is combined with the P and S wave arrival times from the Taiwan Central Weather Bureau Seismic Network (CWBSN) to image the V_p and V_p /V_s structures beneath Taiwan. The records from the 680 TSMIP stations throughout Taiwan in the past 15 years enhance the path coverage and the resolution in the tomography inversions tremendously. Our result for the V_p structure largely confirms previous studies but brings better constraint on the V_p /V_s structure. The colliding Luzon volcanic arc is characterized by a belt of high V_p and high V_p /V_s with high seismicity that includes the offshore islands of Lutao and Lanyu and the Coastal Ranges in eastern Taiwan, at the depth between about 13 and 25 km. This high V_p /V_s belt can be traced to the subduction zone in the region between Hualian and Ilan in the deeper portion. The shallow portions of the southwestern coastal plain and the Pingtung region are also characterized by a belt of high V_p /V_s with lower seismicity. Most of the events occurred at the base of the high V_p /V_s zones. We suggest that material strength in those regions may be too low to accumulate stress, which may indicate water-saturated young sediments. Finally, the Central Range region is characterized by a low V_p /V_s belt.
|Additional Information:||© 2007 American Geophysical Union. Received 12 February 2007; revised 29 May 2007; accepted 6 June 2007; published 23 August 2007. Y.-M. Wu wishes to thank Ta-liang Teng for encouragements and very constructive comments. Critical comments and suggestions by Honn Kao, an anonymous reviewer, and the AE helped improve the manuscript. This research was supported by the National Science Council (NSC95-2625-Z-002-028, NSC95-2119-M-002-043- MY3 and NSC95-2119-M-001-063) with TEC contribution 00004, the Central Weather Bureau of the Republic of China, and Caltech Tectonics Observatory with contribution 71.|
|Group:||Caltech Tectonics Observatory, Caltech Tectonics Observatory. Taiwan Tectonics and Seismicity, Seismological Laboratory|
|Subject Keywords:||earthquake; tomography; seismotectonics|
|Other Numbering System:|
|Official Citation:||Wu, Y.-M., C.-H. Chang, L. Zhao, J. B. H. Shyu, Y.-G. Chen, K. Sieh, and J.-P. Avouac (2007), Seismic tomography of Taiwan: Improved constraints from a dense network of strong motion stations, J. Geophys. Res., 112, B08312, doi:10.1029/2007JB004983|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||15 Nov 2010 23:56|
|Last Modified:||11 Jun 2015 13:57|
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