作者机构:[1]Institute of Disaster Prevention Science and Technology, Sanhe 065201, China, [2]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
相关基金:We thank Dr. Zhengkang Shen and Prof. Zhonghuai Xu for their constructive comments and suggestions. This work was supported by the National Natural Science Foundation of China (40874022) and Public Utility Research Project (200808053).