Open AccessA relative P ‐wave delay study between Eskdalemuir and Charnwood Forest
Author(s) -
Maguire P. K. H.,
Bermingham P. M.,
Francis D. J.
Publication year - 1981
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.1981.tb02711.x
Subject(s) - precambrian , crust , geology , seismology , azimuth , seismic array , wave velocity , p wave , geophysics , paleontology , geometry , medicine , mathematics , cardiology , shear (geology) , atrial fibrillation
Summary. The relative P‐wave delay between CWF, a permanent seismic station on the Precambrian rocks of Charnwood Forest in the English Midlands and EKA, the Eskdalemuir Seismological Array, shows a large azimuthal variation of 1.3 s. This is examined and is consistent with a thinning of the crust from EKA to CWF, together with a considerable thickness of high velocity (most probably greater than 7.0 km s −1 ) lower crust beneath CWF. The Southern Uplands Fault, approximately 42 km to the north‐west at its closest approach to EKA, seems to be associated with a large anomaly in the relative P ‐wave delay. Raypaths from events originating between azimuths 260 to 350° from EKA apparently pass through anomalously high velocity material entering the crust just to the south of the fault.