P-091 EFFECTS OF THIN LAYERS ON THE DETECTION OF AZIMUTHAL ANISOTROPY USING P-WAVES YI-JIE LIU 1 2 ANTON ZIOLKOWSKI 1 ENRU LIU 2 and XIANG-YANG LI 2 1 Department of Geology and Geophysics The University of Edinburgh West Mains Road Edinburgh EH9 3JW UK 2 British Geological Survey Murchison House West Mains Road Edinburgh EH9 3LA UK Introduction Rocks with aligned vertical fractures give rise to azimuthal anisotropy in seismic data and the recorded P-wave amplitudes show an elliptical variation with azimuth. The direction of the long axis indicates the fracture orientation and the ratio of the long to short


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