Abstract：Using interpolation cut method, the expanded gravity anomalies of ideal model on the surface at different scales is separated into several gravity anomalies caused by strata at different depths. Based on separated results, the effects of expanding edge length on gravity anomalies separation are studied from two aspects: the difference of gravity anomalies at different scales and depths, and the mean square deviation between the expanding edge scale and the gravity anomalies separation. The results show that 1) The region boundary effect of ideal model data is related to the expanding edge length, the depth of cutting separation, location, scale and intensity of geological abnormal bodies. 2) In selecting the expanding edge scale, accuracy and computational efficiency should be taken into consideration. The expanded edge size should not be too large, and the expanded edge size and maximum cutting depth for gravity anomalies separation should at least meet the requirements of 2∶1; this significantly improves the boundary effect. When cutting and separating the boundary with large gravity anomalies,it is necessary to further expand the boundary on the basis of twice the scale of expansion. 3) The spatial distribution of the boundary effect is not evenly distributed from the boundary of the data area to the central area, but is related to the scale and spatial location of the anomalous body.
XU Rugang,LIANG Xiao,SUN Hongbo et al. The Effects of Expanding Edge Length in the Processing of Gravity Anomalies Separation: An Example of Interpolation Cut Method[J]. jgg, 2021, 41(3): 221-228.
