1999年台湾集集大地震强地面运动的模拟

利用有限断层模型对1999年台湾集集大地震所产生的近场强地面运动进行了数值模拟,尝试了将具有明确物理意义的震源动力模型的研究结果应用于描述震源过程。计算结果显示,基岩台或接近工程基岩台的计算模拟记录同观测记录符合得很好。进一步研究表明,当综合考虑场地效应对地震动影响时,模拟计算结果得到了明显的改善,同实际观测记录更为相符。本文的研究结果说明,为了科学合理地预测大地震所产生的强地面运动,应综合考虑影响地震所产生的地面运动的"三要素",即:震源过程、传播路径及场地效应。

Strong ground motion simulation of the 1999 Chi-Chi, Taiwan, earthquake

The near field strong ground motions of the 1999 Chi-Chi,Taiwan,earthquake are simulated by using a finite-fault model.A dynamic rupture source model developed by Zhang et al.(2004) is used to describe the source process.The result shows that the simulations for rock sites or very dense sites agree well with the observations.When considering the site-effect,the simulation results are obviously improved,even for the soft soil sites,the spectra of the synthetics have a good match for the observations.The stud...