[S21-4] Lithospheric discontinuities II – Reflectivity

[S21-4-04] The Mid-lithosphere discontinuity beneath North China Craton

^○Weijia Sun¹, B. L. N. Kennett² (1.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China., 2.Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia.)

We image the mid-lithosphere discontinuity (MLD) beneath North China Craton (NCC) by a novel approach — seismic daylight imaging (SDI), which analyzes P reflectivity extracted from stacked autocorrelograms for teleseismic events recorded by several dense arrays. These linear arrays across NCC have average station interval of about 10-15 km, and was deployed by Institute of Geology and Geophysics, Chinese Academy of Sciences under North China Interior Structure Project (NCISP). With higher and broader frequency band (0.5-4Hz) than used with receiver functions, the SDI approach reveals finer scale components of multi-scale lithospheric heterogeneity beneath NCC, which underwent lithospheric destruction in the eastern NCC and seemed to be stable in the western NCC, but with locally lithospheric modification.