Key Laboratory of Deep-Earth Dynamics of Ministry of Land and Resources;
Institute of Geology;
Chinese Academy of Geological Sciences;
Beijing 100037;
China;
State Key Laboratory of Lithospheric Evolution;
Institute of Geology and Geophysics;
Chinese Academy of Sciences;
Beijing 100029;
China;
CAS Center for Excellence in Tibetan Plateau Earth Sciences;
Beijing 100101;
China;
School of Earth Science and Engineering;
Sun Yat-sen University;
Guangzhou 510275;
China;
Institute of Geophysics;
China Earthquake Administration;
Beijing 100081;
China;
Physics of the Earth;
Sciences B;
University of Zaragoza;
Spain;
irregular; surface; flattening; boundary; conforming; grid; multistage; scheme; traveltime; tomography;