Arias Intensity 2
Arias Intensity 2 : A ground-motion parameter derived from an accelerogram and proportional to the integral over time of the acceleration squared. Expressed in units of velocity (m/s or cm/s). More specifically a broadband measure of the strength of strong ground motion observed in an accelerogram, defined by the integral over all natural frequencies of the energy input to a damped single degree of freedom oscillator in response to an accelerogram
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