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Repeating microearthquake sequences interact predominantly through postseismic slip

Lui, Semechah K. Y. and Lapusta, Nadia (2016) Repeating microearthquake sequences interact predominantly through postseismic slip. Nature Communications, 7 . Art. No. 13020. ISSN 2041-1723. PMCID PMC5059473.

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Studying small repeating earthquakes enables better understanding of fault physics and characterization of fault friction properties. Some of the nearby repeating sequences appear to interact, such as the ‘San Francisco’ and ‘Los Angeles’ repeaters on the creeping section of the San Andreas Fault. It is typically assumed that such interactions are induced by static stress changes due to coseismic slip. Here we present a study of the interaction of repeating earthquakes in the framework of rate-and-state fault models using state-of-the-art simulation methods that reproduce both realistic seismic events and long-term earthquake sequences. Our simulations enable comparison among several types of stress transfer that occur between the repeating events. Our major finding is that postseismic creep dominates the interaction, with earthquake triggering occurring at distances much larger than typically assumed. Our results open a possibility of using interaction of repeating sequences to constrain friction properties of creeping segments.

Item Type:Article
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URLURL TypeDescription Information Information CentralArticle
Lapusta, Nadia0000-0001-6558-0323
Additional Information:© 2016 Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit Received 24 Nov 2015. Accepted 26 Aug 2016. Published 5 Oct 2016. This study was supported by the United States Geological Survey (grant G14AP00033), National Science Foundation (grant EAR 1520907) and Southern California Earthquake Center (SCEC, funded by NSF Cooperative agreement EAR-0529922 and USGS Cooperative agreement 07HQAG0008). We thank Rachel Abercrombie, Roland Bürgmann, Ting Chen, Bill Ellsworth, Junle Jiang and Terry Tullis for helpful discussions and comments to the manuscript. Author Contributions: N.L. and S.K.Y.L. co-designed the study. S.K.Y.L. carried out numerical simulations. Both S.K.Y.L. and N.L. contributed to analysing the results and writing the paper. he authors declare no competing financial interests.
Group:Seismological Laboratory
Funding AgencyGrant Number
NSFEAR 1520907
PubMed Central ID:PMC5059473
Record Number:CaltechAUTHORS:20161011-133057552
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Official Citation:Lui, S. K. Y. & Lapusta, N. Repeating microearthquake sequences interact predominantly through postseismic slip. Nat. Commun. 7, 13020 doi: 10.1038/ncomms13020 (2016).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70998
Deposited By: Ruth Sustaita
Deposited On:11 Oct 2016 20:50
Last Modified:19 Jul 2017 00:01

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