中文摘要：

自从＂5·12＂汶川地震后,青川余震一直持续。以2015年9月23日青川M_S4.0级余震监测数据进行研究。通过对比青川东山监测点的地震动响应结果表明：在河谷部位,水平东西向最大峰值加速度大于水平南北向,而在山脊上则水平南北向最大峰值加速度强于水平东西向;相对于河谷（4#）监测点,东山山脊上6#监测点水平向PGA放大系数最大达到2.0,竖直向PGA放大系数为4.0;谱比分析（HVSR）显示,东山监测点谱比分析的地形放大系数最大可达5.6;且卓越频率多在1.5~3.5 Hz之间。研究表明,强震条件下东山斜坡存在明显的地形的放大效应;且位于地形转折处的6#监测点的放大效应最显著。

英文摘要：

Since the ＂5. 12＂Wenchuan earthquake,the aftershocks of Qingchuan have been continuing. The analysis was carried to the latest M_S4. 0 seismic monitoring data on September 23,2015. Compared with the peak acceleration of each monitoring point,it is known that in the valley area,the maximum peak acceleration in the horizontal east-west direction is greater than the maximum peak acceleration in the horizontal north-south direction,while on the ridge,the maximum peak acceleration in the horizontal north-south direction is greater than the maximum peak acceleration in the horizontal east-west direction; Referring to the valley（ 4 #） monitoring points,the horizontal PGA amplification factor of 6 # monitoring points on the Dongshan ridge reached 2. 0,and the vertical PGA amplification coefficient was 4. 0; Spectral ratio analysis（ HVSR） shows that the terrain magnification factor of the Dongshan monitoring points is maximum up to 5. 6,and the most predominant frequency is between 1. 5 and3. 5Hz. The research shows that the amplification effect of the terrain is obvious in the Dongshan slope under strong earthquake,and the 6# monitoring points have the most obvious amplification effect.