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针对目前世界范围内实测重力梯度数据匮乏的现状,文章在原有通过地形制备重力梯度基准图的方法之上,引入了目前两种主流地壳均衡模型:普拉特模型、艾里模型,旨在进一步完善重力梯度基准图的制备.因为充分考虑了地壳密度及厚度的不均匀,所以使得制图更加精确.由于缺乏实测重力梯度数据.因此文章决定通过与实测重力数据比对来验证方法的可行性.实验表明,引入地壳均衡模型制备的重力图与实测数据更加一致,其中,引入普拉特模型后的制图精度要比引入艾里模型的高;另外通过比对实验地区的地壳厚度可知,若在已知地形数据的前提下,通过比较引入普拉特模型制备的局部地区重力异常图与实测重力图,可初步快速准确的估计出该地区的平均地壳厚度.
Aiming at the current situation of lacking of measured gravity gradient data in the world, the paper introduces two main mainstream crustal equilibrium models: Pratt model and Airy model in the original method of preparing gravity gradient datum by topography. The grading of gravitational gradient datum is perfected.Due to the consideration of crustal density and unevenness of thickness, the grading is more accurate.Due to the lack of measured gravity gradiometry data, the article decides the feasibility of the method by comparing with the measured gravimetric data. Experiments show that the gravitational maps prepared by the crustal equilibrium model are more consistent with the measured data, in which the precision of the drawing after the introduction of Pratt model is higher than the introduction of the Airy model. In addition, by comparing the thickness of the crust in the experimental area, Based on the known topographic data, the average crustal thickness in this area can be initially estimated quickly and accurately by comparing the regional gravity anomaly map with the measured gravity map prepared by Pratt model.