A càrrec de Prof. Yih-Min Wu (Department of Geosciences, National Taiwan University, Taipei, Taiwan)
Organitzat conjuntament CSIC-UB

Data: 31-05-2011
Hora: 12:00
Lloc: Sala d'actes de l'Institut Jaume Almera

Descripció
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 Vp and Vp/Vs 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 Vp structure largely confirms previous studies but brings better constraint on the Vp/Vs structure. The colliding Luzon volcanic arc is characterized by a belt of high Vp and high Vp/Vs 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 Vp/Vs belt can be traced to the subduction zone in the region between Hualian and Ilan in the deeper portion.