Presenter: Jen-Chi Chung
Date: 2016/02/25
Abstract
Shear-wave splitting is an important measurement to understand the vertical anisotropic variation beneath seismic stations. This study is focused on Fujian Province in China. We examine shear-wave splitting from data recorded at ten FJSN（Fujian Seismic Network）stations during the period January 1999 to December 2003. The data provided by FJSN to study the seismic anisotropy in the crust.
The results demonstrate that the average fast wave polarization is N109.4∘E , corresponding to the horizontal principal compressive stress in the test zone , and the average normalized slow wave time delay is 2.5 ms/km. The predominant polarizations are in the N-W direction, which suggests that they are related to the regional horizontal principal compressive stress and also to the strikes of faults. The maximum principal stress axis of Fujian is mainly in NW direction 300∘-320∘and the maximum principal directions change regularly from the north to south of Fujian region which are NNW in the north and NWW to near EW in the south . This polarization direction does not coincide with the direction of the horizontal principal compressive stress, but it follows the strikes of the local tectonics and a change in the stress field.
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