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Kinematic Inversion of Physically Plausible Earthquake Source Models Obtained from Dynamic Rupture Simulations

Konca, Ali Ozgun and Kaneko, Yoshihiro and Lapusta, Nadia and Avouac, Jean-Philippe (2013) Kinematic Inversion of Physically Plausible Earthquake Source Models Obtained from Dynamic Rupture Simulations. Bulletin of the Seismological Society of America, 103 (5). pp. 2621-2644. ISSN 0037-1106. doi:10.1785/0120120358.

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One approach to investigate earthquake source processes is to produce kinematic source models from inversion of seismic records and geodetic data. The setup of the inversion requires a variety of assumptions and constraints to restrict the range of possible models. Here, we evaluate to what extent physically plausible earthquake scenarios are reliably restituted in spite of these restrictions. We study which characteristics of ruptures, such as rupture velocity, slip distribution, stress drop, rise time, and slip function, can be reliably determined from the inversion of near‐field seismic and geodetic data. Using spontaneous dynamic rupture simulations, we generate five earthquake scenarios, each of which has different characteristics of the source process. Then we conduct a blind test by modeling the synthetic near‐source data using a standard inversion scheme that optimizes the fit to the observations while searching for solutions with minimum roughness. The inversion procedure assumes a rupture front propagating away from the hypocenter with variable rupture velocity and a simple cosine slip‐time function. Our results show that, overall, slip distribution and stress drop are reasonably well determined even for input models with relatively complex histories (such as a subshear rupture transitioning to supershear speeds). Depth‐averaged rupture velocities are also reasonably well resolved although their estimate progressively deteriorates away from the hypocenter. The local rise time and slip function are not well resolved, but there is some sensitivity to the rupture pulse width, which can be used to differentiate between pulse‐like and crack‐like ruptures. Our test for understanding the inaccuracies in Green’s functions shows that random 3D perturbations of 5% standard deviation do not lead to significant degradation of the estimation of earthquake source parameters. As remedies to the current limitations, we propose smoothing slip function parameters and using more complicated inversion schemes only if data necessitates them.

Item Type:Article
Related URLs:
URLURL TypeDescription Supplement
Kaneko, Yoshihiro0000-0003-2342-0131
Lapusta, Nadia0000-0001-6558-0323
Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:© 2013 Seismological Society of America. Manuscript received 14 December 2012. This study was supported by the National Science Foundation (NSF) (Grant EAR 0548277 to NL), and partially funded by the Gordon and Betty Moore Foundation through Grant GBMF Number 423.01 to the Caltech Tectonics Observatory, and the Southern California Earthquake Center (SCEC). This is Caltech Tectonics Observatory Contribution Number 228. SCEC is funded by NSF Cooperative Agreement EAR-0106924 and U.S. Geological Survey Cooperative Agreement 02HQAG0008. Numerical simulations for this study were performed on the CITerra Dell cluster at the Division of Geological and Planetary Sciences of the California Institute of Technology. This manuscript has benefited from thoughtful suggestions and detailed comments by our reviewers, P. Martin Mai, and one anonymous reviewer.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF 423.01
Southern California Earthquake Center (SCEC)UNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory228
Issue or Number:5
Record Number:CaltechAUTHORS:20131101-103258519
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42186
Deposited By: Tony Diaz
Deposited On:01 Nov 2013 17:42
Last Modified:10 Nov 2021 16:19

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