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Updated Probabilistic and Deterministic Seismic Hazard Analyses for the University of California, Berkeley and Lawrence Berkeley National Laboratory

机译:更新了加州大学伯克利分校和劳伦斯伯克利国家实验室的概率和确定性地震危险性分析

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The purpose of probabilistic seismic hazard analyses (PSHA) is to assess the ground motion levels having specified frequencies of exceedance (return period). In this study, Uniform Hazard Spectra (UHS) at the frequencies of exceedance of 50%, 10%, and 2% in 50 years and 10% in 100 years have been requested and are provided. These exceedance frequencies correspond to return periods of approximately 72, 475, 2,475, and 949 years, respectively. The hazard has been evaluated for two average campus site conditions: thin alluvium over rock at the Central Campus and a rock site at the eastern edge of campus. Because LBNL is situated in the hills above UCB, potential topographic amplification also has been evaluated in this analysis. In this study, the available geologic and seismologic data were used to evaluate and characterize (1) potential seismic sources, (2) the likelihood of earthquakes of various magnitudes occurring on those sources, and (3) the likelihood of the earthquakes producing ground motions exceeding a specified level.

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