METHOD FOR ESTIMATING SURFACE DENSITY VALUE IN GRAVITY GRADIOMETRY DATA

摘要

[Problem] To estimate a surface density distribution that allows application of terrain correction values having high spatial resolution, in which surface terrain, layer thickness, and density are taken into consideration, in analyzing airborne gravity gradiometry survey data. [Solution] Measured horizontal gravity gradient data are arranged in the form of a grid, horizontal gravity gradient values at individual grid points are obtained to create horizontal gravity gradient grid data, the origin of addition coefficient grid data is set so as to overlap each of the grid points, values of products of the horizontal gravity gradient values and the addition coefficients are obtained at all the overlapping grid points, horizontal gravity gradient weighted values are calculated by adding all these values together to create horizontal gravity gradient weighted data, and surface density values are estimated through linear correlation analysis between the horizontal gravity gradient weighted data and synthetic horizontal gravity gradient weighted data attributable to surface mass calculated from terrain elevation data.