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I <br />I <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />t <br />I <br />I <br />t <br />T <br />I <br />T <br />I <br />T <br />Project No. D-3885-06 <br />Christ Our Savior Catholic Parish <br />Peak Ground Acceleration (PGA) from Figure 22-7 0.5869 <br />5% Damped Design Spectral Acceleration at short period, Sp5 I .02 I g <br />5% Damped Design Spectral Acceleration at l-sec period, Se1 0.5689 <br />PSH Deaggregation <br />The following are the results of U.S.G.S. National Seismic Hazard Mapping Project. <br />2008, Interactive PSHA Deaggregation: <br />Peak Horizontal Ground Acceleration for l0% probability of <br />exceedance in 50 years i.e. return period of 475 years <br />Peak Horizontal Ground Acceleration lor l0% probability of <br />exceedance in 100 years i.e. return period of949 years 0.s603g <br />Peak Horizontal Cround Acce leration for 2% probability of <br />exceedance in 50 years i.e. return period of 2,475 years 0.78529 <br />Seismic Hazard Analysis <br />Poorly compacted/deposited granular soils located below the water table can fail through <br />the process of liquefaction during strong earthquake-induced ground shaking. When solid <br />particles in a saturated soil consolidate into a tighter package as a result of earthquake- <br />induced vibration. the non-compressible pore water between the particles is squeezed out. <br />If the soil has a high permeability, a sufficient amount of water will drain out of the pores <br />within a relatively short period of time. However, for soils with low permeability it takes <br />l5 <br />0.4257g <br />The PSH Hazard & Deaggregation plots are presented in Appendix D. <br />Earthquake Induced Liquefaction Evaluation