Abstract
A probabilistic seismic hazard analysis, in conjunction with subsurface geologic investigations, was used to evaluate the liquefaction potential of sand layers at Western Area Power Adminstration's Tracy, California, substation site. The seismic hazard analysis evaluates the peak ground acceleration corresponding to a lower level earthquake with a 50-percent probability of occurrence in 150 years, and two upper level earthquakes with a 10-percent probability of occurrence in 50 and 100 years. Based on the results of the geologic investigations and seismologic studies, it was concluded that the potential of liquefaction at the site for the design earthquakes was low.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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