Abstract
The weathered layer has been shown to contain some of the greatest values of shear wave velocity anisotropy in the earth (Lynn, 1991, Crampin, 1990). The cause of the shear wave velocity anisotropy is most often either due to particle layering in unconsolidated sediments and sedimentary rocks or due to aligned weaknesses commonly manifest as aligned open fractures. The aligned open fractures can be vertical and cross cut bedding in sedimentary rocks or can be horizontal to sub-horizontal and are aligned with bedding. The purpose of this study was to measure the variation in properties associated with the vertical or sub-vertical fractures as these fractures often provide preferential pathways to fluid migration and can also influence recording of deeper seismic shear wave reflection data for oil and gas exploration.
Published Version
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