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Stick-slip tests of pre-cut quartz pegmatite cylinders under tri-axial compression were conducted with a solenoid or toroidal coil near or surrounding the stick-slip plane. The solenoid coil detected damped oscillating signals during stick-slip events. The toroidal coil detected similar oscillations but on an exponential decay. The damped oscillating component is the induced electromotive force (emf)...
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