High-resolution crustal structure of Northeast China revealed by teleseismic receiver functions

In this work, we study the high-resolution crustal structure of Northeast China by using the receiver function method. A total of 259 stations which consist of the China Earthquake Administration, NECESSArray stations and 26 Jilin University temporary stations are used in this study, and finally 16070 high-quality receiver functions are selected. We use the 11-kappa and CCP stacking methods to obtain a high-resolution crustal structure beneath Northeast China. The results show that the Moho depth beneath the study area generally coincides a mirror relationship with the surface elevation. Below the west portion of the Great Xing'an Range, there exists an abrupt change of the Moho depth. In the center of the study area, the crust of the Songliao basin is very thin, which is associated with the regional tectonic extension in the late Mesozoic. In the Songliao basin, the variation of Moho is decreasing from west to east, and we speculate it is related to the subducting Pacific slab. The east part of the study area has a complicated Moho structure, and multiple phases can be observed between the Yilan-Yitong and Dunhua-Mishan faults, which may relate to the mantle-material's underplating. Around the Changbai volcano area, a thick crust and high V-P/V-S structure are observed, which indicates that the magma chambers probably exist in the crust.