CRUSTAL PHASE VELOCITIES OBSERVED AT ESKDALEMUIR SEISMIC ARRAY

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. Copyright © 1969, Wiley Blackwell. All rights reserved