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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 den-sity heterogeneity of the crust and upper mantle and the gravity anomalies caused by such lateral density hetero-geneity, 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/s~2~3×10~(-4) m/s~2. 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 prac-tice 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.
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. the gravity anomalies caused by such lateral density hetero-geneity, and then subtracted gravity anomalies caused by said 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 shows shown the gravity anomalies on the surface of the earth are -6 × 10 ~ (-4) m / s ~ 2 ~ Compared with the resulting 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 prac-tice 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.