Laserfiche WebLink
Site I-atitude (decimal degrccs)33.7329 <br />Site Longitude (decimal degrees)-t 17.92t3 <br />Site Class De finition D <br />Mapped Spectral Response Acceleration at 0.2s Period, S, <br />0..171Mapped Spectral Response Acceleration at I s Period, Sr <br />Short Period Site Coefficient at 0.2s Period. n t.2 <br />Long Period Site Coeflcient at I s Period. [,1.819 <br />Adjusted Spectral Response Acceleration at 0.2s Period, S,ys 1.583 <br />Adjusted Spectral Response Acceleration at ls Period. Sll 0.86 t <br />Design Spectral Response Acceleration at 0.2s Period,.Sos 1.055 <br />Design Spectral Response Acceleration at ls Period, &y 0.571 <br />2019 CBC Seismic l)esign Parameters <br />For liquefaction to occur. all of three key ingredients are required: liquefaction-susceptible <br />soils, groundwater within a depth of 50 feet or less. and strong earthquake shaking. Soils <br />susceptible to liquefaction are generally saturated loose to medium dense sands and non-plastic <br />silt deposits below the water table. <br />According to the State of Califomia Seismic Hazard Zones Map (COMG, 1997), the site is <br />located within an area identified as having a potential for liquefaction. A historic high <br />groundwater 5 feet was adopted in liquefaction analysis. <br />To evaluate the site-specific liquefaction potential. we computed the geometric mean peak <br />ground acceleration (PGA) for the ground motion with a Z%o probability of being exceeded in <br />50 years (Peak Ground Acceleration = 0.6779) from USGS website for MCEp. We used USGS <br />2008 Interactive Deaggregations website tool. This tool is a website developed by USGS to <br />calculate probabilistic response spectra with different hazard levels for spectral periods of up to <br />5 seconds at any location with a given average shear wave velocity in the upper 30 meters <br />(Vs30). Based on the available documentation on the website, the attenuation relationships used <br />in development of the response spectra in the Westem United States are the three Next <br />Generation Attenuation (NGA) relationships of Boore and Atkinson (2007). Campbell and <br />4!F":::Dennis-l -01 <br />Value <br />1.3t9 <br />6.0 LIQUEFACTION POTENTIAL