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Fault-zone damage promotes pulse-like rupture and back-propagating fronts via quasi‐static effects

Idini, B. and Ampuero, J.-P. (2020) Fault-zone damage promotes pulse-like rupture and back-propagating fronts via quasi‐static effects. Geophysical Research Letters . ISSN 0094-8276. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20200102-140235447

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Abstract

Damage zones are ubiquitous components of faults that may affect earthquake rupture. Simulations show that pulse‐like rupture can be induced by the dynamic effect of waves reflected by sharp fault zone boundaries. Here we show that pulses can appear in a highly damaged fault zone even in the absence of reflected waves. We use quasi‐static scaling arguments and quasi‐dynamic earthquake cycle simulations to show that a crack turns into a pulse after the rupture has grown larger than the fault zone thickness. Accompanying the pulses, we find complex rupture patterns involving back‐propagating fronts that emerge from the primary rupture front. Our model provides a mechanism for back‐propagating fronts recently observed during large earthquakes. Moreover, we find that slow‐slip simulations in a highly‐compliant fault zone also produce back‐propagating fronts, suggesting a new mechanism for the rapid‐tremor‐reversals observed in Cascadia and Japan.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020GL09073DOIArticle
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL090736PublisherArticle
https://doi.org/10.31223/osf.io/v8xr2DOIDiscussion Paper
https://osf.io/mhk5dRelated ItemSupplementary Materials
https://github.com/ydluo/qdynRelated ItemCode
ORCID:
AuthorORCID
Idini, B.0000-0002-2697-3893
Ampuero, J.-P.0000-0002-4827-7987
Additional Information:© 2020 American Geophysical Union. Accepted manuscript online: 09 November 2020; Manuscript accepted: 05 November 2020; Manuscript revised: 04 November 2020; Manuscript received: 09 September 2020. This work was supported by the Southern California Earthquake Center (SCEC) and by the French government through the FAULTS R GEMS project (ANR-17-CE31-0008) and the UCAJEDI Investments in the Future project (ANR-15-IDEX-01) managed by the National Research Agency (ANR). SCEC is funded by NSF Cooperative Agreement EAR-1600087 and USGS Cooperative Agreement G17AC00047. This is SCEC Contribution No. 10084. Author contributions: Both authors contributed to the writing of the manuscript and the interpretation of the numerical results. B.I. developed the scaling argument, performed the numerical simulations, and prepared the figures. J.-P. A. designed the study, developed the expressions for the spectral kernel, the static crack numerical solutions and the asymptotic analysis connecting the BK and LVFZ models. Data availability: Data sharing not applicable to this article as no datasets were generated or analyzed during the current study. Code availability: The Quasi-DYNamic earthquake simulator (QDYN) (Luo et al., 2017) used to compute our numerical models of earthquake cycles is available at github.com/ydluo/qdyn. QDYN is freely available for academic research purposes and licensed by GNU General Public License, version 3.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
Agence Nationale pour la Recherche (ANR)ANR-17-CE31-0008
Agence Nationale pour la Recherche (ANR)ANR-15-IDEX-01
NSFEAR-1600087
USGSG17AC00047
Subject Keywords:rupture dynamics; slow earthquakes; fault zone; damaged zone; rapid‐tremor‐reversals
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center10084
Record Number:CaltechAUTHORS:20200102-140235447
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200102-140235447
Official Citation:Idini, B., & Ampuero, J.‐P. (2020). Fault‐zone damage promotes pulse‐like rupture and back‐propagating fronts via quasi‐static effects. Geophysical Research Letters, 47, e2020GL090736. Accepted Author Manuscript. https://doi.org/10.1029/2020GL090736
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100462
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Jan 2020 02:48
Last Modified:10 Nov 2020 21:35

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