Upper crustal shear velocity models from higher mode Rayleigh wave dispersion in Scotland |
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| Authors: | Colin D MacBeth Paul W Burton |
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| Institution: | Natural Environment Research Council, British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA |
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| Abstract: | 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. |
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| Keywords: | crustal structure Rayleigh waves Scotland seismology |
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