Dynamically triggered slip leading to sustained fault gouge weakening under laboratory shear conditions

Johnson, Paul Allan

doi:10.1002/2015GL067056

Dynamically triggered slip leading to sustained fault gouge weakening under laboratory shear conditions

Journal Article · Sun Feb 28 00:00:00 EST 2016 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2015GL067056· OSTI ID:1374315

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We investigate dynamic wave-triggered slip under laboratory shear conditions. The experiment is composed of a three-block system containing two gouge layers composed of glass beads and held in place by a fixed load in a biaxial configuration. When the system is sheared under steady state conditions at a normal load of 4 MPa, we find that shear failure may be instantaneously triggered by a dynamic wave, corresponding to material weakening and softening if the system is in a critical shear stress state (near failure). Following triggering, the gouge material remains in a perturbed state over multiple slip cycles as evidenced by the recovery of the material strength, shear modulus, and slip recurrence time. This work suggests that faults must be critically stressed to trigger under dynamic conditions and that the recovery process following a dynamically triggered event differs from the recovery following a spontaneous event.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; EE0006762

OSTI ID:: 1374315

Alternate ID(s):: OSTI ID: 1402231

Report Number(s):: LA--UR-15-29118

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 4 Vol. 43; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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