Amplification or attenuation of seismic waves while passing through the soil medium can be due to soil type and its stratification or local topographic effects. Such aspects have been theoretically explained in many researches by means of ground response analysis. The results of seismic ground response analysis provide the necessary and realistic information for seismic design of structures and soil-structure interaction problems. In present study, two-dimensional finite element method is applied to evaluate the ground response of valley environments and estimation their interaction effects using time-domain approach. In this regard different cases include free field condition, single valley and double valleys environments are considered. Numerical simulations of seismic wave propagation for these cases are carried out and compared with each other. The results show that irregular topography can greatly amplify the seismic waves. On the other hand, if there are adjacent topographies, due to interaction of them, the amplification effect can be substantially increased. This amplification can be attenuated by moving away from the valley center to free field conditions.

穿过土壤介质时地震波的放大或衰减可能归因于土壤类型及其分层或局部地形效应。在许多研究中，已经通过地面响应分析对这些方面进行了理论解释。地震地面响应分析的结果为结构抗震设计和土-结构相互作用问题提供了必要而现实的信息。在本研究中，采用二维有限元方法评估山谷环境的地面响应，并使用时域方法评估其相互作用效果。在这方面，不同的情况包括自由场条件，考虑了单谷和双谷环境。进行了这些情况下地震波传播的数值模拟，并进行了比较。结果表明，不规则形貌可以极大地放大地震波。另一方面，如果存在相邻的地形，由于它们之间的相互作用，可以大大提高放大效果。通过从谷中心移到自由场条件，可以减弱这种放大。