[an error occurred while processing this directive] ������� 2018, 37(2) 620-626 DOI:   10.3969/j.issn.1004-5589.2018.02.029  ISSN: 1004-5589 CN: 22-1111/P

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PubMed
Article by Wang X
Article by Li Q
Article by Zhang H
Article by Chen H
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1. �й����ʿ�ѧԺ �����о���, ���� 100037;
2. ��Ȼ��Դ������ض���ѧ���ص�ʵ����, ���� 10037;
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Study of P-wave velocity structure in upper mantle in eastern South China
WANG Xiao-ran1,2, LI Qiu-sheng1,2, ZHANG Hong-shuang1,2, CHEN Hao3
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;
2. Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Beijing 100037, China;
3. College of Earth Science, National Central University, Taoyuan 32001, Taiwan, China
Abstract: Based on the observed broadband seismic data from temporary array in the eastern part of South China, the authors utilize the three-dimensional finite difference travel time tomography method to image the three-dimensional P-wave velocity structure of crust-upper mantle in eastern South China. The imaging results show that the velocity distribution varies obviously in the horizontal plane. In the crust-upper mantle above about 163 km, there exist EW-oriented low-velocity anomalies beneath the Lower Yangtze block, while the high-velocity anomalies exist in the Cathaysia block. However, in the upper mantle below 163 km, the velocity anomalies in the lower Yangtze block and the Cathaysia block are reversed. They are reverse symmetric, roughly bounded by the Jiangshan-Shaoxing fault, with significant contrast. The authors believe that these structural features reflect the demolition process of the Yangtze Craton lithosphere in Late Mesozoic. These results provide new evidence to the understanding of the structural evolution and dynamic process of crust-mantle since the Mesozoic in eastern China.
Keywords: finite difference   arrival time tomography   eastern South China   velocity structure   plate subduction   lithosphere demolition  
�ո����� 2018-03-06 �޻����� 2018-05-28 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2018.02.029
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