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# 1615.2.1 Probabilistic Maximum Considered Earthquake

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Where site-specific procedures are used as required or permitted by Section 1615, the maximum considered earthquake ground motion shall be taken as that motion represented by an acceleration response spectrum having a 2-percent probability of exceedance within a 50-year period. The maximum considered earthquake spectral response acceleration at any period,

*S*, shall be taken from the 2-percent probability of exceedance within a 50-year period spectrum.

_{aM}**Exception**: Where the spectral response ordinates at 0.2 second or 1 second for a 5-percent damped spectrum having a 2-percent probability of exceedance within a 50-year period exceed the corresponding ordinates of the deterministic limit of Section 1615.2.2, the maximum considered earthquake ground motion spectrum shall be taken as the lesser of the probabilistic maximum considered earthquake ground motion or the deterministic maximum considered earthquake ground motion spectrum of Section 16 15.2.3, but shall not be taken as less than the deterministic limit ground motion of Section 1615.2.2.

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