Using explicit finite element method and artificial transmitting boundary

the seismic response analysis of a 2D canyon model is performed under three incident SV seismic waves respectively with the assumptions of vertical incidence and oblique incidence at the angle of 30 degrees. The canyon surface ground motions have been compared and the distribution characteristics of ground motions are summarized. It indicates that canyon topography has significant influence on the distribution of ground motions. The peak ground accelerations (PGA) vary greatly from the bottom of the slope to the upper corners. Ground acceleration at high frequency band beyond 1 Hz has been more greatly amplified. And the canyon ground surface has been characterized by relative displacements (RD). It is also found that the incidence angle shows significant influences on the ground motions. Under oblique incident SV waves

the discrete degree of the PGA and RD observed at the canyon surface are much larger than that under vertical incident SV waves.