RESEARCH ON TECTONIC STRESS FIELD DISTRIBUTION WITHIN CRUST
Dang Yamin 1,2) ;Yang Qiang 3) ;and Cao Xuewei 2)
1)Institute of Geodesy and Geodynamic, CASM,Beijing 1000392)Shandong University of Science and Technology, Qingdao 2665103)School of Geodesy and Geomatics, Wuhan University, Wuhan 430079
Abstract According to spherical harmonic coefficients of 360 orders of EGM96 Earth’s gravity field model, density anomaly and tectonic stress in different depth of crust have been calculated. We can draw the following conclusions:1) In the area that there is large variation of density anomaly, tectonic stress is also have a large variation. Thus the density anomaly may be the main cause of tectonic movement;2) If density anomaly is constant, tectonic stress will increase with the increase of depth;3) The average tectonic stresses of three spherical layers located in 25~20 km,32~25 km and 36~32 km are tensile stress, their typical values is 100 MPa,120 MPa and 150 MPa, respectively.
