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Sensitivity analysis study of the source parameter uncertainty factors for predicting near-field strong ground motion

  • Research Article - Solid Earth Sciences
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Abstract

Uncertainty factors have substantial influences on the numerical simulations of earthquakes. However, most simulation methods are deterministic and do not sufficiently consider those uncertainty factors. A good approach for predicting future destructive earthquakes that is also applied to probabilistic hazard analysis is studying those uncertainty factors, which is very significant for improving the reliability and accuracy of ground-motion predictions. In this paper, we investigated several uncertainty factors, namely the initial rupture point, stress drop, and number of sub-faults, all of which display substantial influences on ground-motion predictions, via sensitivity analysis. The associated uncertainties are derived by considering the uncertainties in the parameter values, as those uncertainties are associated with the ground motion itself. A sensitivity analysis confirms which uncertainty factors have large influences on ground motion predictions, based upon which we can allocate appropriate weights to those uncertainty factors during the prediction process. We employ the empirical Green function method as a numerical simulation tool. The effectiveness of this method has been previously validated, especially in areas with sufficient earthquake record data such as Japan, Southwest China, and Taiwan, China. Accordingly, we analyse the sensitivities of the uncertainty factors during a prediction of strong ground motion using the empirical Green function method. We consequently draw the following conclusions. (1) The stress drop has the largest influence on ground-motion predictions. The discrepancy between the maximum and minimum PGA among three different stations is very large. In addition, the PGV and PGD also change drastically. The Arias intensity increases exponentially with an increase in the stress drop ratio of two earthquakes. (2) The number of sub-faults also has a large influence on various ground-motion parameters but a small influence on the Fourier spectrum and response spectrum. (3) The initial rupture point largely influences the PGA and Arias intensity. We will accordingly pay additional attention to these uncertainty factors when we conduct ground-motion predictions in the future.

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Acknowledgements

This research work was supported by the National Natural Science Foundation of China (51678537); the special fund of the Institute of Geophysics, China Earthquake Administration (Grant Number: DQJB18B20; DQJB17B08; DQJB17B02). The earthquake records were obtained from the K-NET network of Japan (http://www.kyoshin.bosai.go.jp/kyoshin/data).

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Authors and Affiliations

  1. Engineering Seismology and Disaster Reduction Division, Institute of Geophysics, CEA, Beijing, 100081, China

    Zongchao Li, Mengtan Gao, Xueliang Chen, Tiefei Li & Xiaofen Zhao

  2. Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, 78731, USA

    Han Jiang

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  1. Zongchao Li
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Correspondence to Mengtan Gao.

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Li, Z., Gao, M., Jiang, H. et al. Sensitivity analysis study of the source parameter uncertainty factors for predicting near-field strong ground motion. Acta Geophys. 66, 523–540 (2018). https://doi.org/10.1007/s11600-018-0171-9

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