Open AccessUpper crustal shear velocity models from higher mode Rayleigh wave dispersion in Scotland
Author(s) -
MacBeth Colin D.,
Burton Paul W.
Publication year - 1985
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.1985.tb06501.x
Subject(s) - geology , rayleigh wave , seismology , shear velocity , shear (geology) , group velocity , upper crust , crust , geodesy , dispersion (optics) , shear waves , homogeneous , love wave , geophysics , wave propagation , longitudinal wave , physics , mechanics , optics , turbulence , petrology , mechanical wave , thermodynamics
Summary. Group velocities for first and second higher mode Rayleigh waves, in the frequency range 0.8–4.8 Hz, generated from a local earthquake of magnitude 3.7 M L in western Scotland, are measured at stations along the 1974 LISPB line. These provide detailed information about the crustal structure west of the line. The data divide the region into seven apparently homogeneous provinces. Averaged higher mode velocity dispersion curves for each province are analysed simultaneously using a linearized inversion technique, yielding regionalized shear velocity profiles down to a depth of 17 km into the upper crust. Shear wave velocity is between 3.0 and 3.4 km s −1 in the upper 2 km, with a slow increase to around 3.8 km s −1 . P ‐wave models computed using these results agree with profiles from the LISPB and LUST refraction experiments.