Crack-induced anisotropy in the crust from shear wave splitting observed in Tangshan region,North China |
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| Authors: | Yuan Gao Si-Hua Zheng Yong Sun |
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| Institution: | 1. Center for Analysis and Prediction, State Seismological Bureau, 100036, Beijing, China
2. Seismological Bureau of Liaoning Province, 110031, Shenyang, China
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| Abstract: | Using the cross correlation function analysis method, this paper discusses shear wave splitting and crack-induced anisotropy in the crust beneath Tangshan, North China, by the digital data from Tangshan strong ground motion temporary arrays. Sixteen of twenty-one stations in the arrays recorded earthquake events available for studying from 1982 to 1984. Having calculated 131 available records, we get slower shear wave time delayτ and faster shear wave polarization azimuthPaz in Tangshan region, and the cracks densityε is got further from them. The analysis shows that the stress field is very complicated in Tangshan region and has strongly regional feature. Because of the complicated distribution of faults, different shear wave splitting characteristics are shown in 16 stations, scatteredτ and differentPaz. And they also were observed that theτ andPaz values were diverse within the time scale of hours in more than one station. In Tangshan region the average results ofτ,Paz andε are 0.0071 s · km?1, northwest-west near to east-west and 0.022 respectively. Meantime, the standard deviations were calculated in this paper. |
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