Multiple regression analyses of duration of earthquake ground acceleration are presented. Duration is defind as the time interval between the time when accleration amplitude firstly exceeds a times (0<a<1) of peak ground acceleration and the time when acceleration amplitude becomes less than a times of peak ground acceleration in the last. Employed were 394 components of horizontal strong motion acceleration records obtained at 67 free field sites in Japan. Empirical formulae of the durations in terms of earthquake magnitude and epicentral distance are propose for three subsoil conditions.
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Kawashima et al. (1985) studied this question.