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Inversion of single-station teleseismic P-wave polarization data for the velocity structure of Beijing area |
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| Authors: | LIU Futian HU Ge Wang Huaijun Chen Xiaofei YOU Qingyu |
| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China 2. Lamont-Doherty Observatory and Department of Geological Sciences, Columbia University, New York 10964, USA 3. Department of Geophysics, Peking University, Beijing 100871, China |
| Abstract: | Broadband three-component seismic data recorded by Beijing station (BJI) of CDSN were used to calculate P-wave polarization of teleseismic events. These polarization data were then used in the inversion for the underground structure around the Beijing station, especially for the details of velocity discontinuities. The result shows that a conspicuous low velocity zone exists in the crust on the west of the station, which is in good agreement with previous studies. It proves the theory that polarization data could be applied to inversion for velocity structures, especially for boundaries with large velocity gradient. It also demonstrates the feasibility of velocity structure inversion with polarization data from high-quality broadband data recorded by a single station. Therefore, travel-times and polarization data can be jointly used to study velocity structure. Polarization data are more suitable for delineating the boundary of velocity anomalies. Moreover, if the polarization method is combined with receiver function method to fully exploit their complementarity, it is possible to obtain the lateral velocity variation around the station as well as the detailed vertical variation below the station. |
| Keywords: | P-wave polarization velocity structure Beijing station |
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