Effect Of Basin And Source Characteristic Parameters On Ground Motion Amplification Characteristics Under Internal Point Source

In this paper,based on the two-dimensional basin model and the internal point source,the influence of the basin characteristic parameters include basin angle and basin depth and source characteristic parameters include source frequency and source depth on the amplification characteristics of the ground motion in time and frequency domain analysis was investigated by using the high-accuracy spectral element method under the action of two source models of point source and surface source.The results show that:1.Under the action of point source,from the time-domain perspective,there is no obvious linear relationship between the change of the maximum amplification coefficient and the change of the angle.The maximum amplification coefficient increases with the basin depth,decreases with the increase of the main frequency of the source,and there is no obvious change with the source depth.From the perspective of frequency domain,the value of the maximum amplification coefficient increases with the decrease of the angle but has no obvious linear relationship with the basin depth.The source frequency increases with the increase of the point source depth.2.Under the action of surface source,from the time-domain perspective,the smaller the basin angle is,the larger the velocity peak amplification coefficient is.With the changes of basin depth,main source frequency and source depth have less impact on the ground motion amplification effect.From the perspective of frequency domain,the mean value of the maximum amplification coefficient does not change significantly with the change of basin angle and basin depth,but increases with the increase of the focal frequency and focal depth.Finally,the research work of this paper is summarized,and the problems that need further study and the prospect of future development are put forward.