Abstract:After a MS6.0 earthquake occurred in Changning county, Yibin city, Sichuan province on June 17, 2019, we deployed multiple seismic monitoring instruments in Shuanghe town to obtain parameters of ground motion under different site conditions. The research results show that: 1) In the same medium, the peak acceleration of ground motion at 60 m elevation can be amplified by 1 to 3 times, and the intensity of Arias can be amplified by 2 to 5 times. At the same time, the amplification effect has certain directional advantages due to the difference of micro-topography. 2) Under the same elevation and different media conditions, the 8-9 m clay-containing gravel can magnify the peak acceleration of ground motion by up to 2 times compared with sandy mudstone, and the Arias intensity can be magnified by 3 to 5 times. 3) The overburden of avalanche deposits with a thin acceleration response spectrum has a significant amplifying effect on the short-period components of the seismic wave, and damages buildings with high stiffness and short natural vibration periods severely. 4) Houses should be located on low-altitude bedrock as much as possiblein strong earthquake mountainous areas, and building materials different from the characteristic period of the foundation should be selected to avoid resonance.
WANG Guokang,WANG Yunsheng,LIU Jiangwei et al. Analysis of Ground Motion Response Characteristics of Low Mountain Slopes in Strong Earthquake Mountainous Areas[J]. jgg, 2022, 42(2): 187-192.