Accuracy of Geoid Heights from Modified Stokes Kernels

Abstract

The phase velocities of crustal P waves across the seismic array at Eskdalemuir have been measured. 71 events within a radius of 180 km were used and an array processing computer program designed to handle the data makes allowance for the curvature of the wave-front and the altitude variations between the seismometers. The phase velocities resulting from this analysis, when plotted against distance from the array, indicate that the crust around Eskdalemuir exhibits a vertical velocity gradient from approximately 5·5 km s−1 at the surface to 6·0 km s−1 at about 12 km followed by a sharp increase to about 6·4 km s−1.