![3d earthquake particle motion playback 3d earthquake particle motion playback](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-018-37716-y/MediaObjects/41598_2018_37716_Fig1_HTML.png)
In general, the analysis methods of site-city interaction can be divided into the analytical method and numerical method. In recent years, with the acceleration of urbanization, buildings become more and dense, making the scale of “Site-Building Groups” larger and larger, which brings new challenges to the seismic safety assessment of the existing buildings on the site and the seismic fortification of the proposed project. Site-City Interaction (SCI) under seismic wave incidence is an active research topic in many fields such as the geotechnical engineering, earthquake engineering, and geophysics. It is of great significance for the planning and layout of buildings in the soft sedimentary basin and the reasonable spacing of buildings to reduce the risk of urban earthquake disaster. For existing buildings, structural reinforcement is needed. When planning important buildings, the center area should be avoided as much as possible. The displacement response of the center of the basin is generally large. Under the action of high-frequency incident waves, denser building groups with more buildings and smaller building spacing have a more pronounced weakening effect on the seismic response of homogeneous sedimentary basins. At a certain incident frequency, the existence of dense building groups will change the spatial distribution of displacement amplitude in the basin. Numerical results illustrate that at low frequency, the displacement cloud image of the homogeneous sedimentary basin model shows an obvious phenomenon of “central focusing.” With the increase of frequency, the displacement cloud image gradually changes from “central focusing” to “multipoint focusing.” Meanwhile, the displacement peak gradually moves from the surface to the center of the basin.
![3d earthquake particle motion playback 3d earthquake particle motion playback](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs40623-017-0687-2/MediaObjects/40623_2017_687_Fig12_HTML.gif)
The viscoelastic artificial boundary is introduced, which can overcome both the defects of low-frequency drift and high-frequency instability, and the equivalent load in frequency domain is obtained by fast Fourier transform for loading, to explore the influence of the different incident frequencies (0.5–5.0 Hz), different numbers (196, 400, 676), and spacing (55 m, 62.5 m, 70 m) of building groups on the ground motion of homogeneous sedimentary basin under the incidence of SV wave.
![3d earthquake particle motion playback 3d earthquake particle motion playback](https://i1.rgstatic.net/publication/324939502_Generalized_Seismic_Phase_Detection_with_Deep_Learning/links/5af5921ca6fdcc0c030bba19/largepreview.png)
By using the harmonic response analysis in the finite element analysis method, the seismic dynamic interaction of the three-dimensional urban building group-homogeneous sedimentary basin is studied.