Abstract
We invert InSAR from ascending and descending passes of ENVISAT/ASAR data to estimate the distribution of coseismic slip for the 2008 Mw 7.2 Yutian earthquake by separately using uniform finite element models (FEMs), non-uniform FEMs, and analytical elastic half-space (Okada) models. We use the Steepest Descent method and Laplacian smoothing to regularize and estimate the slip distribution for each of these different models. Fault surface ruptures interpolated from Quickbird optical images constrain the strike of the fault. The uniform FEM and Okada models assume a fault embedded in a homogeneous and elastic finite domain or half-space, respectively, while the non-uniform FEM describes a domain with spatially variable elastic properties according to the geological structure of Tibet plateau and Tarim. We find that the estimated slip distribution of the non-uniform FEM is similar to that of the uniform FEM but has a slightly larger moment (~2 %). However, more noticeable discrepancies occur between the slip distributions of the uniform FEM and Okada model, where the slip pattern estimated with the FEM looks more scattered and locates at a lower depth. We conclude that, for the case of the Yutian earthquake, the improvement brought by simulating the distribution of geologic material properties is insignificant. This suggests that the uniform geologic structure of Okada models may be sufficient for simulating large intra-continental earthquakes.
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Acknowledgments
This work was supported by the National Science Foundation (40874006), Basic Scientific Funding of Institute of Geology, China Earthquake Administration (LED2008A06), and Projects in the National Science & Technology Pillar Program (2008BAC35B04). Support for TM is provided, in part, by the US NSF EAR-0911466. We also thank Dr. Wang Rongjiang for providing SDM code and Prof. Zhang Jingfa for providing the ascending-pass ENVISAT/ASAR data. Academic licensing for Abaqus software is provided by Simulia, Dassault Systèmes.
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Wang, C., Shan, X., Wang, C. et al. Using finite element and Okada models to invert coseismic slip of the 2008 Mw 7.2 Yutian earthquake, China, from InSAR data. J Seismol 17, 347–360 (2013). https://doi.org/10.1007/s10950-012-9324-5
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DOI: https://doi.org/10.1007/s10950-012-9324-5