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Quantitative relationship between aseismic slip propagation speed and frictional properties

Ariyoshi, Keisuke and Ampuero, Jean-Paul and Bürgmann, Roland and Matsuzawa, Toru and Hasegawa, Akira and Hino, Ryota and Hori, Takane (2019) Quantitative relationship between aseismic slip propagation speed and frictional properties. Tectonophysics, 767 . Art. No. 128151. ISSN 0040-1951. https://resolver.caltech.edu/CaltechAUTHORS:20190709-090253529

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Abstract

Recent observations show evidence of propagation of postseismic slip, which may contain information about the mechanical properties of faults. Here, we develop a new analytical relationship between the propagation speed of aseismic slip transients and fault frictional properties, modeled by a rate- and state-dependent friction law. The relationship explains the propagation speed of afterslip in 3-D numerical simulations to first order. Based on this relationship, we identify systematic dependencies of afterslip propagation speed on effective normal stress σ and frictional properties (the coefficients a and a-b which quantify the instantaneous and the steady-state velocity-dependence of friction, respectively, and the characteristic slip distance L of fault state evolution). Lower values of the parameter A = aσ cause faster propagation in areas where the passage of the postseismic slip front induces large shear stress changes Δτ compared to A, which are typically located near the mainshock rupture. In areas where Δτ/A is small, typically more distant from the mainshock, afterslip propagation speed is more sensitive to (a-b)σ. The propagation speed is proportional to initial slip velocity and, under the condition that loading span is significantly shorter than the passage of postseismic slip, inversely proportional to L. The relationship developed here should be useful to constrain the frictional properties of faults based on observed propagation speeds, independently of rock laboratory experiments, which can then be used in predictive numerical simulations of aseismic slip phenomena.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.tecto.2019.06.021DOIArticle
ORCID:
AuthorORCID
Ariyoshi, Keisuke0000-0002-6353-1082
Ampuero, Jean-Paul0000-0002-4827-7987
Bürgmann, Roland0000-0002-3560-044X
Additional Information:© 2019 Elsevier B.V. Received 24 January 2019, Revised 12 June 2019, Accepted 27 June 2019, Available online 5 July 2019. We would like to thank Robert Viesca for kindly introducing us to his ongoing research. Discussions at the 10th ACES international workshop were fruitful to improve our model. We would like to appreciate many constructive comments from Sylvain Barbot and anonymous reviewer, and thank expeditious handling by the editor Kelin Wang. The present study used the Earth Simulator and the supercomputing resources at the Cyberscience Center of Tohoku University. This study was partly supported by JSPS (Japan Society for the Promotion of Science) KAKENHI (Grants-in-Aid for Scientific Research) Grant Numbers JP 15KK0218, JP15H01148, JP15H04228, JP16H06477, and for Research project for compound disaster mitigation on the great earthquakes and tsunamis around the Nankai trough region. GMT software (Wessel and Smith, 1998) was used to draw a number of the figures.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)JP15KK0218
Japan Society for the Promotion of Science (JSPS)JP15H01148
Japan Society for the Promotion of Science (JSPS)JP15H04228
Japan Society for the Promotion of Science (JSPS)JP16H06477
Subject Keywords:Rate-and-state friction; Postseismic slip; Slow earthquake; 3-D fault modeling
Record Number:CaltechAUTHORS:20190709-090253529
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190709-090253529
Official Citation:Keisuke Ariyoshi, Jean-Paul Ampuero, Roland Bürgmann, Toru Matsuzawa, Akira Hasegawa, Ryota Hino, Takane Hori, Quantitative relationship between aseismic slip propagation speed and frictional properties, Tectonophysics, Volume 767, 2019, 128151, ISSN 0040-1951, https://doi.org/10.1016/j.tecto.2019.06.021. (http://www.sciencedirect.com/science/article/pii/S0040195119302525)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96943
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jul 2019 17:02
Last Modified:03 Oct 2019 21:26

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