宜川-泰安剖面重力异常与构造意义

利用宜川-泰安剖面高精度重力观测和GPS数据测量结果，对观测数据进行各项改正和处理，得到剖面的布格重力异常，并采用高斯低通滤波获得剩余重力异常。以诸城-宜川深地震测深（DSS）速度剖面为约束，对沿该剖面得到的高精度布格重力异常数据进行拟合，获得剖面地壳密度结构。结果表明，趋势异常主要反映该剖面地壳厚度的变化，太行山重力梯级带是地壳厚度的陡变带。结合前人相关研究，对剩余重力异常结合剖面经过的隆起、凹陷等地质问题进行讨论，进一步揭示出，剩余重力异常主要反映浅部地质构造和低密度地质体，剩余重力异常与地质构造不仅具有良好的对应关系, 而且其幅值能体现地质体的基本特征，比布格重力异常反映得更清晰、更细致。

The Gravity Anomaly in Yichuan-Tai’an Profile and Its Tectonic Significance

Based on the gravity observation data with high precision and GPS, the Gravity Anomaly in Yichuan-Tai’an profile is analyzed in this paper. The Bouguer anomaly is obtained by data correction, and the residual gravity anomaly is obtained by Gaussian low-pass filter. We profile the crustal density structure. Fitting the data along the profile of Bouguer gravity anomaly with the constraint of the Zhucheng-Yichuan deep seismic sounding (DSS) velocity profile, the profile density of crust structure is obtained. The study results show that the trend anomalies mainly reflect the change of the crustal thickness in this section, and Taihang mountain gravity is a cascade with abrupt change of the crustal thickness. A further investigation on the residual gravity anomaly is presented by the comparison of our data with other results in the literature. The results indicate that the residual gravity anomaly mainly reflects the geological structure and shallow low density geological body. The residual gravity anomaly and the geological structure have a good correspondence, and the amplitude reflects the basic characteristics of the geological body with clearer detail than does the Bouguer gravity anomaly.