EVALUATION OF SEISMIC SLOPE-PERFORMANCE MODELS USING A REGIONAL CASE STUDY

This paper compares four permanent displacement models based on Newark's sliding-block analogy for assessing regional seismic slope-performance. The models vary primarily by the ground-motion descriptor used to correlate with Newmark displacement. The first uses peak ground-acceleration (PGA). The second uses PGA but normalizes displacements by predominant period and equivalent cycles. The third uses Arias intensity. The fourth calculates cumulative displacements from double-integrating simulated earthquake accelerograms. The models are implemented in a GIS to characterize seismic slope-performance maps for the Oakland East quadrangle near San Francisco, California. The resulting slope-performance maps are compared visually and through statistical analysis to expose potential differences and assess the effects of using a particular approach within a decision-making context. These maps were created for the purpose of comparison and are not suitable for use as critical decision-making tools. The models forecast notably different levels of slope-performance, with the PGA-based models predicting the greatest Newmark displacement on average. Thus, considering the variety of slope-performance models, it is suggested that practitioners avoid reliance on a single model. Instead, multiple models can be implemented in a GIS framework to gain a better perspective of the potential hazard and make a more informed decision. (A)

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  • Corporate Authors:

    ASSOCIATION OF ENGINEERING GEOLOGIES AND THE GEOLOGICAL SOCIETY OF AMERICA

    DEPARTMENT OF GEOLOGY & GEOPHYSICS, TEXAS A&M UNIVERSITY
    COLLEGE STATION, TEXAS  United States  77843-3115
  • Authors:
    • MILES, S B
    • KEEFER, D K
  • Publication Date: 2000-2

Language

  • English

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Filing Info

  • Accession Number: 00795101
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 7 2000 12:00AM