Abstract
We simulate accumulative Coulomb failure stress change in a layered Maxwell viscoelastic media in the northeastern Qinghai-Xizang (Tibetan) Plateau since 1920. Lithospheric stress/strain evolution is assumed to be driven by dislocations of large earthquakes (M≥7.0) and secular tectonic loading. The earthquake rupture parameters such as the fault rupture length, width, and slip are either adopted from field investigations or estimated from their statistic relationships with the earthquake magnitudes and seismic moments. Our study shows that among 20 large earthquakes (M≥7.0) investigated, 17 occurred in areas where the Coulomb failure stress change is positive, with a triggering rate of 85%. This study provides essential data for the intermediate to long-term likelihood estimation of large earthquakes in the northeastern Tibetan Plateau.
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Foundation item: National Natural Science Foundation of China (40374012 and 40334042) and State Key Fundamental Research Development Plan Project (2001CB711005).
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Wan, Yg., Shen, Zk., Zeng, Yh. et al. Evolution of cumulative Coulomb failure stress in northeastern Qinghai-Xizang (Tibetan) Plateau and its effect on large earthquake occurrence. Acta Seimol. Sin. 20, 117–132 (2007). https://doi.org/10.1007/s11589-007-0117-9
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DOI: https://doi.org/10.1007/s11589-007-0117-9