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Imbricated slip rate processes during slow slip transients imaged by low-frequency earthquakes

Lengliné, O. and Frank, W. B. and Marsan, D. and Ampuero, J.-P. (2017) Imbricated slip rate processes during slow slip transients imaged by low-frequency earthquakes. Earth and Planetary Science Letters, 476 . pp. 122-131. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20171020-073933775

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Abstract

Low Frequency Earthquakes (LFEs) often occur in conjunction with transient strain episodes, or Slow Slip Events (SSEs), in subduction zones. Their focal mechanism and location consistent with shear failure on the plate interface argue for a model where LFEs are discrete dynamic ruptures in an otherwise slowly slipping interface. SSEs are mostly observed by surface geodetic instruments with limited resolution and it is likely that only the largest ones are detected. The time synchronization of LFEs and SSEs suggests that we could use the recorded LFEs to constrain the evolution of SSEs, and notably of the geodetically-undetected small ones. However, inferring slow slip rate from the temporal evolution of LFE activity is complicated by the strong temporal clustering of LFEs. Here we apply dedicated statistical tools to retrieve the temporal evolution of SSE slip rates from the time history of LFE occurrences in two subduction zones, Mexico and Cascadia, and in the deep portion of the San Andreas fault at Parkfield. We find temporal characteristics of LFEs that are similar across these three different regions. The longer term episodic slip transients present in these datasets show a slip rate decay with time after the passage of the SSE front possibly as t^(−1/4). They are composed of multiple short term transients with steeper slip rate decay as t^(−α) with α between 1.4 and 2. We also find that the maximum slip rate of SSEs has a continuous distribution. Our results indicate that creeping faults host intermittent deformation at various scales resulting from the imbricated occurrence of numerous slow slip events of various amplitudes.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.epsl.2017.07.032DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X17304168?via%3DihubPublisherArticle
ORCID:
AuthorORCID
Ampuero, J.-P.0000-0002-4827-7987
Additional Information:© 2017 Elsevier B.V. Received 27 April 2017, Revised 17 July 2017, Accepted 20 July 2017, Available online 1 September 2017. We thank D. Shelly and M. Bostock for providing access to their LFE catalog. We thank S. Yabe and an anonymous reviewer for their suggestions. W.B.F. was supported by NSF grant EAR-PF 1452375. J.P.A. acknowledges support of NSF CAREER grant EAR-1151926.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1452375
NSF Postdoctoral FellowshipEAR-1151926
Subject Keywords:low-frequency earthquakes; slow slip; swarm
Record Number:CaltechAUTHORS:20171020-073933775
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171020-073933775
Official Citation:O. Lengliné, W.B. Frank, D. Marsan, J.-P. Ampuero, Imbricated slip rate processes during slow slip transients imaged by low-frequency earthquakes, In Earth and Planetary Science Letters, Volume 476, 2017, Pages 122-131, ISSN 0012-821X, https://doi.org/10.1016/j.epsl.2017.07.032. (http://www.sciencedirect.com/science/article/pii/S0012821X17304168)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82531
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Oct 2017 17:26
Last Modified:20 Oct 2017 17:26

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