LISPB — V. Studies of crustal shear waves |
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| Authors: | M Assumpção D Bamford† |
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| Institution: | Institute of Geological Sciences. Murchison House, West Mains Road, Edinburgh EH9 3LA;Department of Geophysics, University of Edinburgh, May field Road, Edinburgh EH9 3JZ |
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| Abstract: | Summary. Many shots in the LISPB profiles produced shear waves with large amplitudes which were recorded by three-component stations. However, S waves seem to be strongly attenuated when they propagate through complex velocity structures. Upper crustal refractions (mainly land shots) and wide-angle reflections (mainly sea shots) were picked with the help of particle motion plots. S to P travel-time ratios ( ts/tp ) were used to calculate the distribution of Poisson's ratios in a crustal model. The results were generally close to σ= 0.25 except in the upper crust south of the Southern Uplands Fault (σ= 0.231) and in the middle crust under the Midland Valley (σ= 0.224). |
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