Moment tensor inversion of induced microseismic events - Evidence of non-shear failures in the -4 to -2 moment magnitude range

Physics

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Mining, Seismology, Shear Stress, Tensors, Tunneling (Excavation), Accelerometers, Green'S Functions, Manitoba

Scientific paper

To assess objectively the source mechanism of mining-induced seismic events, an algorithm to invert for the moment tensor components. From this inversion, the ratio of isotropic/deviatoric component in the source is obtained. The method is applied to microseismic events (M = -4 to -2) recorded at the Underground Research Laboratory in Pinawa, Manitoba, where a tunnel is being excavated at 420 m depth. To monitor the seismic activity induced by this opening an array of 16 triaxial accelerometers was installed around the planned tunnel. Results from the moment tensor inversion on a first data set provide evidence of nonshear failure mechanisms. Furthermore, the location of events displaying a tensile component corresponds to a breakout observed underground in the roof of the tunnel.

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