prediction equation for arrival times of near-source strong ground motions velocity pulses using pulse-like records

In this study an equation is represented to predict arrival time of strong ground motion pulse. the arrival time of a velocity pulse with respect to the strong ground motion duration has been defined through a parameter, normalized arrival time (nat). the functional form of the model was an additive of 4 predictor variables, namely moment magnitude (𝑀𝑤),rupture distance (𝑅𝑟𝑢𝑝), time-averaged shear-wave velocity in the top 30 m of soil (𝑉𝑆30), and the style of faulting effect (𝐹𝑚), which has been considered for the first time as an indicator directly in the functional form. the equation could estimate nat of velocity pulses of earthquakes with moment magnitudes from 5.5 to 7.9 and rupture distances of up to90 km. the results shown that the nat generally increased with increase in magnitude and rupture distance. as a case study the nat of sarpol-e zahab 2017 earthquake of iran is reproduced with the proposed equation and compared with the recorded data.