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Observation of pressure stimulated voltages in rocks using an electric potential sensor

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4 Author(s)
Aydin, A. ; Centre for Physical Electronics and Quantum Technology, School of Engineering and Design, University of Sussex, Brighton BN1 9QT, United Kingdom ; Prance, R.J. ; Prance, H. ; Harland, C.J.

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Recent interest in the electrical activity in rock and the use of electric field transients as candidates for earthquake precursors has led to studies of pressure stimulated currents in laboratory samples. In this paper, an electric field sensor is used to measure directly the voltages associated with these currents. Stress was applied as uniaxial compression to marble and granite at an approximately constant rate. In contrast with the small pressure stimulated currents previously measured, large voltage signals are reported. Polarity reversal of the signal was observed immediately before fracture for the marble, in agreement with previous pressure stimulated current studies.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 12 )

Date of Publication:

Sep 2009

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