Open AccessCrustal Phase Velocities Observed at the Eskdalemuir Seismic Array
Author(s) -
Jacob A. W. B.
Publication year - 1969
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1969.tb03561.x
Subject(s) - seismometer , geology , seismology , crust , seismic array , geodesy , phase (matter) , phase velocity , curvature , radius , seismic wave , seismic tomography , tiltmeter , altitude (triangle) , mantle (geology) , geophysics , geometry , optics , physics , amplitude , mathematics , computer security , quantum mechanics , computer science
Summary 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 .