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Table 7b <br /> Ratio of Ground Motion from Previous Studies to 2017 Study <br /> Return 2013 2011 1995* <br /> Period PGA 1.0 see PGA 1.0 see PGA <br /> (Years) SA SA <br /> 500 1.02 1.33 2.04 2.22 2.45 <br /> 1,000 0.85 1.17 2.00 2.57 1.90 <br /> 2,000 0.82 1.03 2.00 2.58 1.47 <br /> 3,000 0.86 0.94 1.95 2.37 1.36 <br /> 5,000 0.87 0.93 1.83 2.29 1.20 <br /> 10,000 0.90 0.91 1.74 2.32 - <br /> US <br />