Study on forward-directivity velocity pulse generated by strike slip fault in full space;

Because of the existing of the near_fault ground motions with the velocity pulse effect, which has put new question for the seismic design of structure, the characters of the velocity pulse for the typical near_fault ground motions are analyzed.

In this paper, the effect of velocity pulse in near field ground motions is emphasized and the influence of velocity pulse to acceleration velocity and displacement in earthquake ground motions is analyzed by using simple impact modal.

Many people previously focused on velocity pulses which result from acceleration pulses,however,recently a few researchers began to directly study acceleration pulses,such as to get high frequency pulses and low frequency pulses with empirical mode decomposition.

In recent years, the observation data of several strong earthquakes and the simulation of near-field strong ground motion have shown that a large velocity pulse usually exists in near field especially in near fault region during to the impact of rupture directivity effect.