Jerk is the rate of change of acceleration. It is a vector quantity and its scalar magnitude is also the third derivative of position of a body or joint of a structure. Its dimension is [length/time3]. This paper proposes formulas and presents graphs for jerk response spectrum for a given earthquake ground motion with different damping ratios. A few variants of combined response spectrum graph are shown. All graphs include the jerk response spectrum. The fractional derivative theory was used to improve the combined spectrum representation. A parameter (named miamisi) for assessing the size of the earthquake impact, incorporating the displacement and acceleration, is suggested.
