关键词: 接收函数, 地壳结构, 泊松比

Abstract: Songhuajiang-Liaohe Basin is surrounded by several folded mountains,with some major deep faults running across them.Among these faults,the Tanlu Fault is one of biggest active faults in the east China continent.This kind of geological environment makes Liaoning and its adjacent areas be capable of highly active tectonic movement and high seismicity.As crustal thickness and Poisson ratio are closely related to seismogenic structure,studying on these parameters will be very important for us to understand the seismogenic process of Liaoning and its neighboring regions.In this work,teleseismic P wave records from 15 permanent broadband seismic stations in Liaoning province are collected and processed by inverse convolution method in spectral domain to get the P wave receiver functions.The H-Kappa stacking method is further used to obtain the crustal thickness and Poisson ratio under each seismic station.The result shows that Poisson ratio in this region is between 0.25and 0.29,and crustal thickness ranges from 31km to 36km.Comparing with the Harbin Basin,the crustal thickness of the west and east fold belts in this region is about 2～4km thicker.The distribution pattern of crust thickness shows that the crust is getting thicker from east to west and from north to south,with an average crustal thickness about 31km in Songliao Basin.This pattern shows that the Songhuajiang-Liaohe Basin is a typical rift basin,its seismogenic process may mainly be controlled by the subsidence of the basin and the horizontal extension from the east and the west boundaries.

Key words: receiver function, crustal thickness, Poisson ratio