Based on parallel simulating program PSAP

four long-period seismic waves and two common waves were selected in three dimensional long-period seismic responses equivalent-linear parallel analysis of a valley topography site under various seismic waves excitations

characteristics of long-period seismic response have been studied and traveling wave effect of valley topography site under different apparent wave velocity excitation has been discussed.The results show that traveling wave excitation will lead to significant vertical seismic responses in local site

the horizontal acceleration responses under long-period seismic waves excitation are greater than common waves excitation obviously

and the PC cluster parallel computation is also performed to raise the computational efficiency in solving the mass computing problem.