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Seismic anisotropy of the crust in Yunnan,China:polarizations of fast shear-waves

Acta Seismologica Sinica(English Edition) 2006年第6期19卷 620-632页

作者：石玉涛高原吴晶罗艳苏有锦 Institute of Earthquake Science China Earthquake AdministrationBeijing 100036 China Earthquake Administration of Yunnan Province Kunming 650041 China

Using seismic data recorded by Yunnan Telemetry Seismic Network from January 1, 2000 to December 31, 2003, the dominant polarization directions of fast shear-waves are obtained at 10 digital seismic stations by SAM technique, a systematic analysis method on shear-wave splitting, in this study. The results show that dominant directions of polarizations of fast shear-waves at most stations are mainly at nearly N-S or NNW direction in Yunnan. The dominant polarization directions of fast shear-waves at stations located on the active faults are consistent with the strike of active faults, directions of regional principal compressive strains measured from GPS data, and basically consistent with regional principal compressive stress. Only a few of stations.show complicated polarization pattern of fast shear-waves, or are not consistent with the strike of active faults and the directions of principal GPS compressive strains, which are always located at junction of several faults. The result reflects complicated fault distribution and stress field. The dominant polarization direction of fast shear-wave indicates the direction of the in-situ maximum principal compressive stress is controlled by multiple tectonic aspects such as the regional stress field and faults.

关键词： seismic anisotropy polarization of fast shear-wave principal compressive stress active faults GPS

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shear-wave splitting of Sichuan Regional Seismic Network

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Earthquake Science 2008年第2期21卷 127-138+219页

作者：张永久高原石玉涛程万正 Earthquake Administration of Sichuan Province Institute of Earthquake Science China Earthquake Administration

Using seismic data recorded by the Chengdu Digital Seismic Network from May 1, 2000 to December 31, 2006, we obtain the dominant polarization directions of fast shear-waves at eight digital seismic stations adopting the SAM technique. The results show that the dominant directions of polarizations of fast shear-waves at most of sta-tions are mainly in nearly NE-SW or NW-SE direction in Sichuan. The dominant polarization directions of the fast shear-waves at stations located at the active faults or intersection of several active faults are consistent with the strikes of active faults which control the earthquakes used in the analysis, and are basically consistent with the directions of regional compression axis. However, several stations show that the fast shear-waves are not consis-tent with the strikes of active faults and the directions of regional compression axis, due to the influence of local complicated crustal structure.

关键词： shear-wave splitting polarization of fast shear-wave compression axis active fault Sichuan region

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shear-wave splitting in the crust:Regional compressive stress from polarizations of fast shear-waves

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Earthquake Science 2012年第1期25卷 35-45页

作者： Yuan Gao Yutao Shi Jing Wu Lingxue Tai Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

When propagating through anisotropic rocks in the crust, shear-waves split into faster and slower components with almost orthogonal polarizations. For nearly vertical propagation the polarization of fast shear- wave （PFS） is parallel to both the strike of the cracks and the direction of maximum horizontal stress, therefore it is possible to use PFS to study stress in the crust. This study discusses several examples in which PFS is applied to deduce the compressive stress in North China, Longmenshan fault zone of east edge of Tibetan plateau and Yunnan zone of southeast edge of Tibetan plateau, also discusses temporal variations of PFS orientations of 1999 Xiuyan earthquake sequences of northeastern China. The results are consistent to those of other independent traditional stress measurements. There is a bridge between crustal PFS and the crustal principal compressive stress although there are many unclear disturbance sources. This study suggests the PFS results could be used to deduce regional and in situ principal compressive stress in the crust only if there are enough seismic stations and enough data. At least, PFS is a useful choice in the zone where there are a large number of dense seismic stations.

关键词： polarization of fast shear-wave shear-wave splitting compressive stress in the crust seismic anisotropy

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