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I entered a Vs30 < 180 m/s but the computer changed it to 180 m/s. Why?

April 26, 2017changed Computer s vs30

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I entered a Vs30 < 180 m/s but the computer changed it to 180 m/s. Why?

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Western U.S. attenuation models were prepared to handle site response with Vs30 >= 180 m/s. For the NEHRP E site class the NGA relations do not have a corresponding model.