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Title: The influence of Preslip Sealing on the Permeability Evolution of Fractures and Faults

Abstract

The evolution of permeability on fractures and faults during the full earthquake cycle is shown to be sensitive to sealing during the repose phase. We explore the combined effect of static loading followed by fracture reactivation on permeability evolution via slide-hold-slide experiments. During the hold periods, permeability exhibits a slow but continuous reduction. The permeability decay is consistent with power law compaction of the aperture coupled with cubic law flow. With increasing hold periods, permeability evolves following reactivation from net reduction to net increase with the magnitude of the permeability change dependent on the hold period. This implies that the tight interlocking of asperities during interseismic repose primes the fault for permeability enhancement following reactivation. The inferred mechanism is via shear dilation with the probable involvement of unclogging. This result identifies that preslip sealing during repose is an essential component in the cyclic permeability evolution throughout the seismic cycle.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1537305
Alternate Identifier(s):
OSTI ID: 1416802
Grant/Contract Number:  
FE0023354
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 1; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geology

Citation Formats

Im, Kyungjae, Elsworth, Derek, and Fang, Yi. The influence of Preslip Sealing on the Permeability Evolution of Fractures and Faults. United States: N. p., 2018. Web. doi:10.1002/2017gl076216.
Im, Kyungjae, Elsworth, Derek, & Fang, Yi. The influence of Preslip Sealing on the Permeability Evolution of Fractures and Faults. United States. doi:10.1002/2017gl076216.
Im, Kyungjae, Elsworth, Derek, and Fang, Yi. Wed . "The influence of Preslip Sealing on the Permeability Evolution of Fractures and Faults". United States. doi:10.1002/2017gl076216. https://www.osti.gov/servlets/purl/1537305.
@article{osti_1537305,
title = {The influence of Preslip Sealing on the Permeability Evolution of Fractures and Faults},
author = {Im, Kyungjae and Elsworth, Derek and Fang, Yi},
abstractNote = {The evolution of permeability on fractures and faults during the full earthquake cycle is shown to be sensitive to sealing during the repose phase. We explore the combined effect of static loading followed by fracture reactivation on permeability evolution via slide-hold-slide experiments. During the hold periods, permeability exhibits a slow but continuous reduction. The permeability decay is consistent with power law compaction of the aperture coupled with cubic law flow. With increasing hold periods, permeability evolves following reactivation from net reduction to net increase with the magnitude of the permeability change dependent on the hold period. This implies that the tight interlocking of asperities during interseismic repose primes the fault for permeability enhancement following reactivation. The inferred mechanism is via shear dilation with the probable involvement of unclogging. This result identifies that preslip sealing during repose is an essential component in the cyclic permeability evolution throughout the seismic cycle.},
doi = {10.1002/2017gl076216},
journal = {Geophysical Research Letters},
number = 1,
volume = 45,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
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