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Fully probabilistic seismic displacement analysis of spatially distributed slopes using spatially correlated vector intensity measures

Authors

  • Wenqi Du,

    1. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, SAR, China
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  • Gang Wang

    Corresponding author
    1. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, SAR, China
    • Correspondence to: Gang Wang, Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.

      E-mail: gwang@ust.hk

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SUMMARY

Earthquake-induced slope displacement is an important parameter for safety evaluation and earthquake design of slope systems. Traditional probabilistic seismic hazard analysis usually focuses on evaluating slope displacement at a particular location, and it is not suitable for spatially distributed slopes over a large region. This study proposes a computationally efficient framework for fully probabilistic seismic displacement analysis of spatially distributed slope systems using spatially correlated vector intensity measures (IMs). First, a spatial cross-correlation model for three key ground motion IMs, that is, peak ground acceleration (PGA), Arias intensity, and peak ground velocity, is developed using 2686 ground motion recordings from 11 recent earthquakes. To reduce the computational cost, Monte Carlo simulation and data reduction techniques are utilized to generate spatially correlated random fields for the vector IMs. The slope displacement hazards over the region are further quantified using empirical predictive equations. Finally, an illustrative example is presented to highlight the importance of the spatial correlation and the advantage of using spatially correlated vector IMs in seismic hazard analysis of spatially distributed slopes. Copyright © 2013 John Wiley & Sons, Ltd.

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