【作者】 许萍； 傅容珊； 黄建平； 戴志阳； 查显杰；

【Author】 XU Ping FU Rongshan HUNAG Jianping DAI Zhiyang ZHA Xianjie College of Earth and Space Science, University of Science and Technology of China, Hefei 230026

【机构】 中国科学技术大学地球和空间科学学院；

【摘要】 本文利用地震层析成像的结果推算地壳和上地幔部密度异常分布,计算了由此部分引起的重力异常。在从观测布格重力异常中扣除上述密度异常引起的重力异常后的数据基础上,直接反演了中国西北区域莫霍界面的深度。对比以前直接使用布格重力异常反演地壳厚度的结果表明,该方法对莫霍界面将产生6km的修正。本方法将使得利用重力数据反演地壳厚度是在理论上更为完备,实际应用中也比较可行,对我们更为详细了解莫霍界面的形态,提供了新的算法。更多还原

【Abstract】 We calculated the gravity anomalies which was caused by the density anomalies of crust and mantle derived from the result of seismological tomograpy. Subtracting the gravity anomalies caused by density anomalies from the observed Bouguer anomalies, we inversed the depth of Moho of northwestern China by using the residu- al anomalies. Compared with the result inversed directly by the Bouguer anomalies, this method yielded a correction of 6km for the Moho depth. Compared with previous studies, the method we adopted is more reliable, and feasible in practice. Therefore, it provides us a new tool approach to determine the pattern of Moho.更多还原