NEHRP Clearinghouse

Seismic Risk Analysis for Two-Sites Case.
Tong, W. H.
National Science Foundation, Washington, D.C. Research Applied to National Needs., May 1975, 87 p.
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As a first step in analysis of the earthquake safety of lifeline systems, the simplest case of spatially distributed targets is studied: two identical targets in a uniform earthquake source area. The variation of the probability of exceeding a specified level of shaking (at least one of the sites or at both sites simultaneously) with respect to spacing of the targets is analyzed. Both deterministic and probabilistic attenuation laws are considered, and a sensitivity study is performed with respect to the constants of the attenuation law. As part of this study, a more accurate treatment is developed regarding the effect of uncertainty in the attenuation law.
Probability theory; Seismic design; Spatial distribution; Seismic risk; Earth movements; Ground motion; Earthquake engineering; Buildings; Site surveys; Risk; Seismic design decision analysis; Earthquakes