Depth determination of the Moho interface beneath the Tibetan plateau and other areas of China
Youshun Sun1, 2, Diming Yu3, M Nafi Toksoz2, F Dale Morgan2, Xiyu Wang2, Jinrong Su3, Jun Liu2, 4
1 State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 3 Earthquake Administration of Sichuan Province, Chengdu 610041, China 4 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Depth determination of the Moho interface beneath the Tibetan plateau and other areas of China
Youshun Sun1, 2, Diming Yu3, M Nafi Toksoz2, F Dale Morgan2, Xiyu Wang2, Jinrong Su3, Jun Liu2, 4
1 State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 3 Earthquake Administration of Sichuan Province, Chengdu 610041, China 4 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
摘要We apply the adaptive moving window method of Sun et al. to the most recent catalog data and the data recorded by portable stations to construct the velocity structure of the crust and upper mantle, and to determine the depth of the Moho interface beneath the Tibetan plateau and other areas of China. We first select 2 600 locations in the study region with 1° intervals, then at each location invert for a five-layer 1-D P-wave velocity model from the surface down to the uppermost mantle by performing a Monte Carlo random search. The Moho depth at each location is then determined, and the Moho interface beneath the study region is obtained through proper interpolation with certain smoothing. Compared to depths obtained by previous studies, our results show more accurate Moho depths in the Tibetan plateau, Tianshan region and other areas of the study region.
Abstract：We apply the adaptive moving window method of Sun et al. to the most recent catalog data and the data recorded by portable stations to construct the velocity structure of the crust and upper mantle, and to determine the depth of the Moho interface beneath the Tibetan plateau and other areas of China. We first select 2 600 locations in the study region with 1° intervals, then at each location invert for a five-layer 1-D P-wave velocity model from the surface down to the uppermost mantle by performing a Monte Carlo random search. The Moho depth at each location is then determined, and the Moho interface beneath the study region is obtained through proper interpolation with certain smoothing. Compared to depths obtained by previous studies, our results show more accurate Moho depths in the Tibetan plateau, Tianshan region and other areas of the study region.
基金资助:the Defense Threat Reduction Agency under Contract Number DTRA01-00-C-0024, and also supported by Chinese Academy of Sciences fund KJCX2-EW-121
通讯作者:
Youshun Sun
E-mail: youshun007@yahoo.com.cn
引用本文:
Youshun Sun, Diming Yu, M Nafi Toksoz, F Dale Morgan, Xiyu Wang, Jinrong Su, Jun Liu. Depth determination of the Moho interface beneath the Tibetan plateau and other areas of China[J]. 《地震学报》英文版, 2012, 25(5-6): 415-431.
Youshun Sun, Diming Yu, M Nafi Toksoz, F Dale Morgan, Xiyu Wang, Jinrong Su, Jun Liu. Depth determination of the Moho interface beneath the Tibetan plateau and other areas of China. Earthquake Science, 2012, 25(5-6): 415-431.
