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Study on strain field of continental China using multiple seismological parameters

WANG Hui~(1,2),ZHANG Guo-min~1,JIANG Zai-sen~1, MA Hong-sheng~1,WANG Xin-ling~1 (1.Institute of Earthquake Science, CEA, Beijing 100036; 2.Institute of Geophysics, CEA, Beijing 100081, China)  
Study on crustal strain field is a basic field in geodynamic researches. The researches in the field are mainly centralized in the survey and studies of the crustal deformation, including the leveling survey and GPS survey in a large area, etc. In this paper, the crustal strain field of the continental China is studied by using several seismic parameters. The statistic relationship between magnitude of surface wave and scalar seismic moment in different regions of China is presented by using Harvard CMT catalogue and present-day earthquake catalogue of China. Then, the historical earthquake data are used to study the crustal strain field on the China's continent, and the distribution of the seismic maximal shear strain rate is presented. The result indicates that the Tibetan Plateau and its surrounding regions show a high-value of maximal shear strain rates, and the strain rates in the Pamirs and Asam regions are the largest. Compared with the GPS strain field, these two kings of results are coincident. The distribution of seismic apparent strain in China's continent is studied by using the seismic radiated energy catalogue that provide by the NEIC (National Earthquake Information Center). The distribution of apparent strain is related with the level of crustal deformation, and the apparent stains of earthquakes that located in the surrounding regions of Tibetan Plateau are higher. Those results provide new scientific data for the researches on geodynamic.
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