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https://hdl.handle.net/2440/13699
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Type: | Journal article |
Title: | Hammer-induced seismic investigations in an area of observed anisotropy |
Author: | Squire, S. Hillis, R. Rutty, M. |
Citation: | Exploration Geophysics, 1995; 26(2-3):202-205 |
Publisher: | Australian Society Exploration Geophysicists - CSIRO |
Issue Date: | 1995 |
ISSN: | 0812-3985 1834-7533 |
Abstract: | Abstract A seismic experiment was undertaken in order to investigate the effect of an observed (outcropping) fracture set on shear-wave propagation, and more specifically whether the observed fracture set induced shear-wave birefringence. The source for the experiment was a hammer swung to impact horizontally on a source block coupled to the ground by two large metal pins. Eight three-component geophones recorded arrivals up to 40m offset from the hammer source. Impacts of opposite polarity in the in-line and cross-line direction were differenced in order to maximise S-wave, and minimise P-wave energy. After vector gain, filtering and rotation of the recorded data into in-line and cross-line directions, Alford rotation was undertaken on selected windowed events in order to detect shear-wave birefringence. In-line and cross-line energy is maximised by a co-ordinate rotation to the north?south direction, parallel to the observed fracture direction, suggesting that the observed fracture direction results in an anisotropy that induces shear-wave birefringence. |
Keywords: | Shear-wave birefringence fracture direction hammer source experiment |
DOI: | 10.1071/EG995202 |
Published version: | http://www.publish.csiro.au/?act=view_file&file_id=EG995202.pdf |
Appears in Collections: | Aurora harvest 2 Geology & Geophysics publications |
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