T22A-04
Crust and upper mantle anisotropy and deformation characteristics in North China craton
Tuesday, 15 December 2015: 11:15
304 (Moscone South)
Huajian Yao, USTC University of Science and Technology of China, Laboratory of Seismology and Physics of Earth's Interior, Hefei, China, Jikun Feng, USTC University of Science and Technology of China, Hefei, China, Lihua Fang, Institute of Geophysics, CEA, Beijing, China and Jianping Wu, Institute of Geophysics, China Eathquake Administration, Beijing, China
Abstract:
North China Craton (NCC) is one of the oldest cratons in the world. Since early Paleozoic, massive lithospheric thinning and destruction has occurred in the eastern part of the NCC, however, still with debates on its mechanisms. The thinning of lithosphere has caused many volcanic activities and crustal deformation in NCC, while seismic anisotropy is an effective tool to study crustal and upper mantle deformation in different scales. Surface wave studies can resolve depth-dependent radial and azimuthal anisotropy, which provide important constraints on depth-varying deformation patterns of crust and upper mantle. Here we use the dense array data (200 stations) in NCC and joint analysis of ambient noise and earthquake surface waves to reveal depth-dependent azimuthal anisotropy in the crust and upper mantle in NCC. In together with local and teleseismic shear wave splitting data, surface deformation field from GPS observations and large scale upper mantle flow patterns, we have better constraints on how crust and lithospheric mantle in NCC deform with respect to the thinning or destruction of the lithosphere due to regional scale mantle flow or delamination processes.
