Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 10, Pages 3422-3430Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059965
Keywords
Acoustic Emission; Source Parameter; Mining; Seismology; Rock; Fracture
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Atomic Energy Canada Limited (AECL)
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In this paper, we revisit acoustic emission (AE) data from an in situ rock fracture experiment conducted at the Underground Research Laboratory (URL) in Manitoba, Canada. The Mine-By experiment, a large-scale excavation response test, was undertaken at a depth of 420 m and involved the mechanical excavation of a cylindrical tunnel. During the experiment a small array of 16 Panametrics V103 AE sensors enclosed a 0.7 m x 0.7 m x 1.1 m rectangular prism of Lac du Bonnet granite located in the tunnel wall. The V103 sensors were later calibrated in the laboratory, and a source parameter analysis was undertaken using a spectral fitting method. Corner frequency and moment magnitude were found to be inside the ranges 250 kHz < f(c) < 490 kHz and -7.5 < M-w < -6.8, respectively. Static stress drops ranged from 0.3 to 4 MPa, which is consistent with large seismicity recorded at the URL.
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