Abstract The purpose of this paper is to study the engineering and time-frequency characteristics of ground motion in different regions of near-fault. Considering the relationship between the characteristics of near-fault ground motions, such as the rupture directivity effect, fling-step effect, hanging wall effects, and fault types, the near-fault ground motion of Chi-Chi earthquake in Taiwan is selected as the research object from the database PEER. Its near-fault ground motion is divided into the rupture forward region(RFR) ground motion, the hanging wall region(HWR) ground motion, the foot wall region(FWR) ground motion, and the rupture backward region(RBR) ground motion, according to the relative positions relationship between the fault rupture and the ground motion observing station. Further, we compare and analyze the characteristics of three elements of four types of near-fault ground motions, and analyze the difference of energy distribution in time-frequency by the Hilbert-Huang transform. The results show that: 1) The seismic characteristic parameters such as PGA, PGV, PGD and PGV/PGA of RFR, HWR, FWR and RBR are significantly different, leading to great influence on the seismic response of structures. 2) The ground motion in RFR region shows significant long-period effect, the ground motion in RBR region has the characteristics of high-frequency and large-scale value, and the ground motion in HWR and FWR shows the characteristics of high-frequency large-scale value and significant long-period effect. 3) The high values of ground motion energy in RFR, HWR,FWR and RBR are mainly concentrated in 0 to 5.2 Hz middle and low frequency band, among them, the maximum instantaneous energy in HWR is the largest, and the maximum instantaneous energy in RFR is the smallest.
CHEN Yang,WANG Qiuliang,QIN Weibing et al. Analysis of Engineering and Time-Frequency Characteristics of Near-Fault Ground Motion from the Chi-Chi Earthquake in Taiwan[J]. jgg, 2021, 41(10): 1069-1075.
CHEN Yang,WANG Qiuliang,QIN Weibing et al. Analysis of Engineering and Time-Frequency Characteristics of Near-Fault Ground Motion from the Chi-Chi Earthquake in Taiwan[J]. jgg, 2021, 41(10): 1069-1075.