Abstract
Shear-wave splitting parameters of 24 stations in southeastern Capital area of North China (38.5°N∼39.85°N, 115.5°E ∼118.5°E) are obtained with systematic analysis method of shear-wave splitting (SAM) based on the data recorded by Capital Area Seismograph Network (CASN) from 2002 to 2005. The results show that the average polarization of fast shear-wave in southeastern Capital area is consistent with regional maximum horizontal principal compressive stress in the area, and is also consistent with maximum horizontal principal compressive strain from GPS in North China. The average shear-wave splitting in southeastern Capital area (in basin) is different from that in northwestern Capital area where uplifts and basin exist, which means that tectonics can be related to shear-wave splitting results. Research also shows that the distribution of faults around stations can obviously affect the shear-wave splitting results, and complicated distribution of faults can result in much more scatter of shear-wave splitting. Moreover, in the north and south of the studied area (southeastern Capital area), the polarizations of fast shear-wave are not very consistent, which may be related to differences in tectonic and stress for the two areas.
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Foundation Item: Seismic Professional Science Fund (200708008), Basic and Special Research Foundation, Institute of Earthquake Science, China Earthquake Administration (2007-13) and National Natural Science Foundation of China (40674021).
Contribution No. 07FE3004, Institute of Geophysics, China Earthquake Administration.
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Wu, J., Gao, Y. & Chen, Yt. Crustal seismic anisotropy in southeastern Capital area, China. Acta Seismol. Sin. 21, 1–10 (2008). https://doi.org/10.1007/s11589-008-0001-2
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DOI: https://doi.org/10.1007/s11589-008-0001-2