In valleys buildings are commonly tightly located. However

the interaction between sedimentary valley and compact buildings under ground motion is currently not clear. Therefore

in this paper

the indirect boundary element method (IBEM) is used to analyze the valley-buildings effect under the plane SV waves. The results show that there exists significant and complex dynamic interaction between the sedimentary valley and buildings

and the seismic response of the buildings in the valley illustrates rapid alternation of strong and weak amplitude. The interaction characteristics strongly depend on the crucial factors such as incident angle of seismic wave

sedimentary valley group of medium and depth of the sedimentary valley. Overall

the buildings group has a large effect on the seismic response of shallow alluvial valley

and the seismic response can decrease by 50% for high-frequency wave incidence. It’s necessary to consider the effect of the buildings when we evaluate the seismic amplification effect in the actual valley

and the anti-seismic design standard of the buildings located at the focus of seismic waves should be properly improved.