Abstract
Seismic precursors (such as anomalous Vp values and/or seismic activity) whose behaviour is qualitatively similar to those reported to precede earthquakes are observed before rock failures in dry underground mines. Similar processes may be involved during failure of rock in the mine and the earthquake, and diffusion of fluids into the focal region of a potential earthquake may not be a necessary condition to produce most of the precursors reported.
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References
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Brady, B. T., Pure and appl. Geophys. (in the press).
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Brady, B. Seismic precursors before rock failures in mines. Nature 252, 549–552 (1974). https://doi.org/10.1038/252549a0
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DOI: https://doi.org/10.1038/252549a0
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