Anisotropy Effects on Microseismic Event Location |
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Authors: | Andrew King Shahriar Talebi |
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Institution: | (1) CSIRO Exploration and Mining, P.O. Box 883, Kenmore, QLD, 4069, Australia;(2) CANMET-MSSL, 555 Booth St, BCC 10, Ottawa, ON, K1A 0G1, Canada |
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Abstract: | Seismic anisotropy in sedimentary environments is significant—microseismic waveforms often show strong shear-wave splitting,
with differences reaching 40% between horizontally and vertically-polarized shear-wave velocities. Failure to account for
this anisotropy is shown to result in large microseismic event location errors. A method is presented here for determining
the five elastic parameters of a homogeneous, vertical transverse-isotropic (VTI) model from calibration shot data. The method
can also use data from mining-induced seismic events, which are then simultaneously located. This simple model provides a
good fit to arrival times from coal-environment data, and results in dramatic shifts in interpreted event locations. |
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Keywords: | Anisotropy transverse isotropy coal mine microseismic source location |
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