Document Type
Article
Publication Date
2013
Keywords
beneath; forms; Seismic anisotropy; Foliation; Taiwan orogeny
Abstract
Taiwan is known as a strongly anisotropic region observed from SKS 1 - 2 s delay time and other teleseismic phases. An estimate of the crustal contribution to the total anisotropy from the foliated Central Range is essential to understanding the overall teleseismic results. We used P wave arrivals from the dense seismic arrays deployed during the TAIGER active source experiments and the permanent broadband seismic stations to determine the crustal anisotropy. From the arrival time analysis as a function of azimuth, we detected a clear cos(2 theta) pattern. The strength of the crustal anisotropy (0 - 15 km depth) reaches 8 - 10% and the fast direction azimuth is around 35 - 43 degrees for the overall mountain ranges. The anisotropic variations from the central to the north are found in detail. The results could indicate that the upper crustal delay time contribution of teleseismic shear waves reaches up to 0.45 s. The geological data at the surface and geophysical observations imply a coherent deformation from the surface to the lower crust or even down to the upper mantle.
Publisher Attribution
Kuo-Chen, H., Sroda, P., Wu, F., Wang, C. Y., & Kuo, Y. W. (2013). Seismic Anisotropy of the Upper Crust in the Mountain Ranges of Taiwan from the TAIGER Explosion Experiment. Terrestrial, Atmospheric & Oceanic Sciences, 24(6).
Recommended Citation
Hao, Kuo-Chen; Sroda, Piotr; Wu, Francis T.; Wang, Chien-Ying; and Kuo, Yao-Wen, "Seismic Anisotropy of the Upper Crust in the Mountain Ranges of Taiwan from the TAIGER Explosion Experiment" (2013). Earth Sciences Faculty Scholarship. 3.
https://orb.binghamton.edu/geology_fac/3