EXH1228049834

FROM: Douglas Lindquist, EIT, Michael Bailey, P.E., Hart Crowser, Inc. RE: Additional Information on the Seismic Design }-4978-30 CO: Jim Thomson, P.E., HNTB This memorandum provides additional information regarding the seismic analyses performed for the Third Runway at the Sea-Tac International Airport in SeaTac, Washington. ,_......... This discussion includes the probabilistic seismic hazard analysis (PSHA) and the ensuing ground response analyses used to provide the basis for analysis of seismic stability, deformation, and liquefaction potential. This memorandum provides an overview and details for the following: 1. Seismic Sources; 2. Attenuation Relationships; 3. Results of the PSHA; 4. Input Motion Development; and 5. One-Dimensional Site Response Analysis. OVERVIEW OF PROBABILISTIC SEISMIC HAZARD ANALYSIS Seismically induced ground motions at the Third Runway site can be produced by earthquakes from a number of different shallow and deep sources spread throughout the greater Puget Sound region. Hart Crowser and subconsultant Professor Steven L. Kramer • : ., .. .: _,.., _ __,_ '._,_'°_ STIA 00519 AR 049834 L IrE, Embankment Technical Review Board J-4978-30 January 25, 2001 Page 2 used a probabilistic seismic hazard analysis (PSHA) to evaluate ground motion characteristics for different seismic hazard levels. The characteristics of ground motions with different exceedence probabilities were evaluated by quantifying the uncertainties in earthquake magnitude, recurrence, and location, and by considering the uncertainties in ground motion parameter predictions. The results of the PSHA indicate the probability that a certain level of ground shaking will be exceeded in any given time period, such as a seismic…

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Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]