HR: 1340h
AN: T43B-1336    [Abstracts]
TI: A Study of Seismotectonics of the Miaoli-Taichung Area, Taiwan
AU: * LIN, P
EM: r95224213@ntu.edu.tw
AF: Department of Geosciences, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
AU: WU, Y
EM: drymwu@ntu.edu.tw
AF: Department of Geosciences, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
AU: CHANG, C
EM: gensin@scman.cwb.gov.tw
AF: Central Weather Bureau, No. 64, Gongyuan Road, Taipei, 10048, Taiwan
AU: HUANG, H
EM: r94224211@ntu.edu.tw
AF: Department of Geosciences, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
AB: The Miaoli-Taichung area, which is located at central-western Taiwan, is under full collision process between forearc and continent. During the last century, two large earthquakes occurred on the Tuntzuchiao fault (M7.1) and the Chelungpu fault (Mw7.6) in 1935 and 1999, respectively. In order to reduce the damage of the future earthquakes, it is urgent to map the potential earthquake sources beneath this region. The Miaoli-Taichung seismotectonics were studied based on analysis of recently published datasets of three-dimensional velocity structures, focal mechanisms and relocated catalog from 1991 to 2005. Results indicated that higher bedrock should exist beneath Taichung and may be a major structure in the study area. From the evidence of the seismicity, the Chelungpu and Shuangtung faults could be located in a same detachment. The west Changhua fault might also be located in the detachment even though very little seismicity was correlated to it during the study period. It is possible that the Changhua fault has been in a lock mode and could be a potential source. The Tuntzuchiao fault was also inactive from 1991 to 2005. However, it could extend northeastward after the 1999 Chi- Chi earthquake.
DE: 7200 SEISMOLOGY
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 8100 TECTONOPHYSICS
DE: 8123 Dynamics: seismotectonics
DE: 8150 Plate boundary: general (3040)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting