关键词: 有限运动源, 近场问题, 点源叠加法, 临界值

Abstract: The kinematical finite source is considered as stacking of dynamic point sources based on the dynamic independent principle. The stacking has two means, the stacking of the area of sources and the stacking of the kinematical process. Following this idea, the authors showe different discretizing method and rise time for different propagating models of the finite source. The stacking method is validated by comparing with analytical results. The relationship between the critical value and rise time, special distribution of stations, crack propagating velocity for a strike-slip fault in a two-layer earth model are further discussed. The analysis shows that to keep the precision of the synthetic seismograms, the critical areas vary with the rupture speed, frequency of the source time function and the position of the stations. The resultscan be a valuable reference fordiscritizing the planar element in strong ground motion simulation and near source inversion.

Key words: kinematical finite source, near source problem, point source stacking, critical value