Study of the Crustal Thickness and Poisson's Ratio in Guangdong with Receiver Function Method
The teleseismic data recorded at 49 seismic stations in Guangdong were selected,and the P-wave receiver func-tion was extracted using the iterative deconvolution method in the time domain.The crustal thickness and Poisson's ra-tio below the stations were obtained by the H-κ superposition method.The results show that:①In Guangdong region,the crustal thickness ranges from 24.8 to 31.0 km,with an average of 28.3 km,and becomes thinner and thinner from northwest to southeast,showing a regional zonal distribution.This may be related to the geological structure of the uplifted mountains,plains and high land in the study area.(2)In Guangdong region,Poisson's ratio ranges from 0.220 to 0.287,with a mean value of 0.244.Poisson's ratio is higher in the north and lower in the south,and is higher in coastal areas than inland areas;Poisson's ratio distributes in regional blocks.This may be related to the geo-logical blocks cut by deep major faults in the Crust.(3)The distribution of the Crustal thickness and Poisson's ratio cor-respond well with the distribution of the faults and they vary significantly near the faults.④The Crustal thickness and Poisson's ratio are negatively correlated,because during the evolution of the Crust,the ancient Pacific plate extruded toward the Guangdong continent,then the mantle-sourced materials got into the Crust,and partially melted in the deep Crust.This led to the increase of the contents of magnesium and iron in the rocks,thus causing the increase of Poisson's ratio.
Guangdong regionreceiver functioncrustal thicknessthe Poisson's ratio
万方数据
维普
