Abstract
— We have tested to which extent commonly used dynamic rupture parameters can be resolved for a realistic earthquake scenario from all available observations. For this purpose we have generated three dynamic models of the Landers earthquake using a single, vertical, planar fault with heterogeneity in either the initial stress, the yield stress, or the slip-weakening distance. Although the dynamic parameters for these models are inherently different, all the simulations are in agreement with strong motion, GPS, InSAR, and field data for the event. The rupture propagation and slip distributions obtained for each model are similar, showing that the solution of the dynamic problem is non-unique. In other words, it is not always possible to separate strength drop and the slip-weakening distance using rupture modeling, in agreement with the conclusions by GUATTERI and SPUDICH (2000).
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Acknowledgements This research was supported by grants from the project “Modélisation des séismes et changement d’échelles” from the ACI Prévention des catastrophes naturelles from the Ministère de la Recherche, and by NSF (EAR0003275), University of California at Sarta Barbara, Los Alamos National Laboratories, and the Southern California Earthquake Center. SCEC is funded by NSF Cooperative Agreement EAR-0106924 and USGS Cooperative Agreement 02HQAG0008. The SCEC contribution number for this paper is 720, and the ICS contribution number is 556. The computations in this study were carried out on the SUN Enterprise at MRL/ICS and on the facilities of the Département de Modélisation Physique et Numérique of the Institut de Physique du Globe de Paris.
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Peyrat, S., Olsen, K. & Madariaga, R. Which Dynamic Rupture Parameters Can Be Estimated from Strong Ground Motion and Geodetic Data?. Pure appl. geophys. 161, 2155–2169 (2004). https://doi.org/10.1007/s00024-004-2555-9
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DOI: https://doi.org/10.1007/s00024-004-2555-9