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Rate-and-state friction properties of the Longitudinal Valley Fault from kinematic and dynamic modeling of seismic and aseismic slip

Thomas, Marion Y. and Avouac, Jean-Philippe and Lapusta, Nadia (2017) Rate-and-state friction properties of the Longitudinal Valley Fault from kinematic and dynamic modeling of seismic and aseismic slip. Journal of Geophysical Research. Solid Earth, 122 (4). pp. 3115-3137. ISSN 2169-9313. http://resolver.caltech.edu/CaltechAUTHORS:20170317-102149527

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Abstract

The Longitudinal Valley Fault (LVF, Taiwan) is a fast slipping fault (∼5 cm/yr), which exhibits both seismic, and aseismic slip. Geodetic and seismological observations (1992-2010) were used to infer the temporal evolution of fault slip [Thomas et al., 2014a]. This kinematic model is used here to estimate spatial variations of steady-state velocity dependence of fault friction and to develop a simplified fully-dynamic rate-and-state model of the LVF. Based on the postseismic slip, we estimate that the rate-and-state parameter (a – b) σ[over-bar] decreases from ∼1.2 MPa near the surface to near velocity-neutral at 19 km depth. The inferred (a − b) values are consistent with the laboratory measurements on clay-rich fault gouges comparable to the Lichi Mélange, which borders the LVF. The dynamic model that incorporates the obtained (a – b) σ[over-bar] estimates as well as a VW patch with tuned rate-and-state properties produces a sequence of earthquakes with some realistic diversity and a spatio-temporal pattern of seismic and aseismic slip similar to that inferred from the kinematic modeling. The larger events have moment magnitude (M_w∼6.7) similar to the 2003 Chenkung earthquake, with a range of smaller events. The model parameterization allows reproducing partial overlap of seismic and aseismic slip before the earthquake, but cannot reproduce the significant postseismic slip observed in the previously locked patch. We discuss factors that can improve the dynamic model in that regard, including the possibility of temporal variations in (a − b) due to shear heating. Such calibrated dynamic models can be used to reconcile field observations, kinematic analysis, and laboratory experiments, and assess fault behavior.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016JB013615DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016JB013615/abstractPublisherArticle
ORCID:
AuthorORCID
Thomas, Marion Y.0000-0002-4335-8841
Avouac, Jean-Philippe0000-0002-3060-8442
Lapusta, Nadia0000-0001-6558-0323
Additional Information:© 2017 American Geophysical Union. Received 3 OCT 2016; Accepted 9 MAR 2017; Accepted article online 17 MAR 2017; Published online 10 APR 2017. This project was partly supported by the Gordon and Betty Moore Foundation through grant GBMF423.01 to the Tectonics Observatory. The paper was completed at Oxford with support for MT from the Natural Environment Research Council large grant, Looking Inside the Continents from Space (NE/K011006/1). All data for this paper are properly cited and referred to in the reference list. Kinematic analysis and numerical models have been generated using PCAIM (http://www.tectonics.caltech.edu/resources/pcaim/download.html) and BICycle (Caltech, Pasadena, USA), respectively. Numerical simulations for this study were carried out on the CITerra Dell cluster at the Division of Geological and Planetary Sciences of the California Institute of Technology. We thank Yoshihiro Kaneko, Eric Lindsey, and an anonymous reviewer for insightful detailed comments that helped us improve the manuscript.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF423.01
Subject Keywords:friction properties; kinematic analysis; dynamic modeling; Longitudinal Valley Fault; Taiwan; seismic and aseismic slip
Record Number:CaltechAUTHORS:20170317-102149527
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170317-102149527
Official Citation:Thomas, M. Y., J.-P. Avouac, and N. Lapusta (2017), Rate-and-state friction properties of the Longitudinal Valley Fault from kinematic and dynamic modeling of seismic and aseismic slip, J. Geophys. Res. Solid Earth, 122, 3115–3137, doi:10.1002/2016JB013615
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75198
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Mar 2017 14:38
Last Modified:02 Oct 2017 17:55

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