TY - JOUR
T1 - Shear wave anisotropy beneath the Taiwan orogen
AU - Rau, Ruey Juin
AU - Liang, Wen Tzong
AU - Kao, Honn
AU - Huang, Bor Shouh
N1 - Funding Information:
We thank the staff of the Seismology Center of the Central Weather Bureau and the Institute of Earth Sciences, Academia Sinica, for providing high quality earthquake data used in this research. We also thank B.-Y. Kuo for stimulating discussions. The manuscript benefited from the constructive comments of Ray Russo and an anonymous reviewer. The research was partially supported by the Institute of Earth Sciences, Academia Sinica, and the Satellite Geoinformatics Research Center, National Cheng Kung University, Taiwan. [RV]
PY - 2000/4/30
Y1 - 2000/4/30
N2 - Shear wave splitting in regional and teleseismic shear waves (ScS and S) has been analyzed for fast polarization directions and delay times at 33 short-period and 17 broad-band permanent and temporary seismic stations in the Taiwan region. The orientation of anisotropy for the Taiwan stations are generally parallel to the strike of the mountain belt, with a clockwise rotation following the trend of regional geologic fabric in north Taiwan. The delay times, on the other hand, vary greatly from 0.5 to 2.1 s; the largest values are from the southwestern Taiwan foothills, and an abrupt change indelay times is found in south Taiwan. The main source of shear wave splitting in Taiwan is compatible with an anisotropic region between 25 and 230 km depths. The observed splitting parameters are consistent with upper mantle anisotropy resulting from the collisional tectonics that built the Taiwan orogen. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
AB - Shear wave splitting in regional and teleseismic shear waves (ScS and S) has been analyzed for fast polarization directions and delay times at 33 short-period and 17 broad-band permanent and temporary seismic stations in the Taiwan region. The orientation of anisotropy for the Taiwan stations are generally parallel to the strike of the mountain belt, with a clockwise rotation following the trend of regional geologic fabric in north Taiwan. The delay times, on the other hand, vary greatly from 0.5 to 2.1 s; the largest values are from the southwestern Taiwan foothills, and an abrupt change indelay times is found in south Taiwan. The main source of shear wave splitting in Taiwan is compatible with an anisotropic region between 25 and 230 km depths. The observed splitting parameters are consistent with upper mantle anisotropy resulting from the collisional tectonics that built the Taiwan orogen. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
UR - http://www.scopus.com/inward/record.url?scp=0034127919&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034127919&partnerID=8YFLogxK
U2 - 10.1016/S0012-821X(00)00058-3
DO - 10.1016/S0012-821X(00)00058-3
M3 - Article
AN - SCOPUS:0034127919
SN - 0012-821X
VL - 177
SP - 177
EP - 192
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 3-4
ER -