Seismic moment tensor and b value variations over successive seismic cycles in laboratory stick-slip experiments
Abstract
The formation of fault damage due to slip under high normal stresses can rarely be monitored under in situ conditions. To advance our understanding of microfracture processes, we investigated stick-slip events on Westerly granite samples containing the following: (1) a planar saw cut fault and (2) a fault developed from a fresh fracture surface. We examined temporal changes of seismic moment tensors and b values of acoustic emission (AE) events. During experiment on the saw cut surface, small AEs exhibiting non-double-couple components were observed continuously and strong AEs displaying double-couple components were visible only when approaching the slip onsets. Sliding on naturally fractured surfaces showed, in addition to double-couple components, significant volumetric contributions, especially during the interslip periods and immediately after stick-slip events indicating substantial shear-enhanced compaction within a relatively broad damage zone. The obtained results shed light on how differences in fault structure control the kinematics of microseismicity during different periods of the seismic cycle.
Additional Information
© 2014 American Geophysical Union. Received 14 JUL 2014; Accepted 3 AUG 2014; Accepted article online 7 AUG 2014; Published online 20 AUG 2014. We would like to thank G. McLaskey, an anonymous reviewer, and the Editor A.V. Newman for many valuable comments and suggestions. The data used in this study were processed at GFZ German Research Centre for Geosciences and are available on request by contacting the first author. The Editor thanks Gregory McLaskey and an anonymous reviewer for their assistance in evaluating this paper.Attached Files
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Additional details
- Eprint ID
- 51351
- Resolver ID
- CaltechAUTHORS:20141106-091811819
- Created
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2014-11-06Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field