Asymmetric High and Steep Valley Slope Ground Motion Response for the Luding Ms4.5 Earthquake
Based on the measured ground motion data of the Ms4.5 earthquake in Luding,Sichuan in 2023,we conduct an asymmetric slope time-frequency domain data analysis.The results show that:1)The PGA amplification factor at monitoring point 1# on the right bank is highest,with horizontal and vertical values of 3.16 to 15.08 and 4.37,respectively.2)The maximum Arias intensity on the right bank is 2.24 cm/s,and the maximum Arias intensity on the left bank is 0.79 cm/s,indicating that the seismic energy on the right bank is stronger.3)The dominant frequency distribution of the monitoring points on the right bank of the slope is 2 to 9 Hz,while the dominant frequency on the left bank is 2 to 17 Hz.The energy presented by the seismic amplitude is more concentrated in the hori-zontal than in the vertical direction.On the right bank of the asymmetric high steep valley slope,the protruding peninsula shaped slope terrain has a stronger response than the straight shaped slope.
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