地震学报（英文版）2005，Vol.18Issue(6)：643-650,8.
Correction to the crustal thickness of the northwestern China using the data of seismic tomography
Correction to the crustal thickness of the northwestern China using the data of seismic tomography
摘要
Abstract
Considering the influence of the density anomaly of the crust and upper mantle on the gravity, we provide a new arithmetic to invert the crustal thickness. Applying the result of seismic tomography, we calculated the lateral density heterogeneity of the crust and upper mantle and the gravity anomalies caused by such lateral density heterogeneity, and then subtracted gravity anomalies caused by mentioned density anomalies from observational Bouguer anomalies, finally in view of the correction on the initial crustal thickness based on the hypothesis of isostasy, inverted the regional crustal thickness. Using the data of seismic tomography from XU et al, we inverted the Moho depth beneath northwestern China. It is shown that the gravity anomalies on the surface of the earth are -6×10-4 m/s2～3×l0-4 m/s2. Compared with the result inverted directly using Bouguer anomalies, this method can bring correction of 6 km to the Moho depth. And this method make it further mature in theory and feasible in practice to invert the thickness of the crust using data of grarity and provide a new arithmetic for us to understand the conformation of the Moho.关键词
seismic tomography/Fourier transform/Bouguer anomalies/MohoKey words
seismic tomography/Fourier transform/Bouguer anomalies/Moho分类
天文与地球科学引用本文复制引用
XU Ping,FU Rong-shan,HUANG Jian-ping,DAI Zhi-yang,ZHA Xian-jie..Correction to the crustal thickness of the northwestern China using the data of seismic tomography[J].地震学报（英文版）,2005,18(6):643-650,8.基金项目
the Project of Knowledge Innovation Program of Chinese Academy of Sciences (KZCX3-SW-131) and National Natural Science Foundation of China (40274033). （KZCX3-SW-131）
