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Evolution of microseismicity during frictional sliding

Sammonds, P; Ohnaka, M; (1998) Evolution of microseismicity during frictional sliding. Geophysical Research Letters , 25 (5) 699 -702. 10.1029/98GL00226. Green open access

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Abstract

We have done frictional sliding experiments on Inada granite in double shear and monitored the acoustic emission (AE) produced and temporal changes in the microseismic b-value (where b is defined as the log-linear slope of the AE frequency-amplitude distribution), using both rough and smooth ground simulated fault surfaces. We have found, (i) the maximum amplitudes of AE events during stable sliding are strongly dependent on the surface roughness with smooth-ground surfaces giving smaller maximum AE amplitudes; (ii) b-values are related to the surface topographic fractal dimensions, so that in steady-state stable sliding smooth surfaces exhibit lower b-values than rough surfaces; (iii) the b-value falls before stick-slip instability. The change of b with slip we interpret in terms of evolving fractal crack damage during frictional sliding of the fault surfaces.

Type: Article
Title: Evolution of microseismicity during frictional sliding
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/98GL00226
Publisher version: http://dx.doi.org/10.1029/98GL00226
Language: English
Additional information: Copyright 1998 by the American Geophysical Union
Keywords: Contact, Surfaces, Fracture
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/736572
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