Velocity pulse distributions along the Anqiu-Juxian fault during earthquakes of varying magnitudes
As the latest active fault in the Yishui fault zone,the Anqiu-Juxian fault has the high-est seismic risk in the area.The finite difference method can easily separate differences and offers high computation efficiency.In this study,we used the finite difference method to establish the kinematic source model of the Anqiu-Juxian fault during Mw7.0,Mw6.5,and Mw6.0 earth-quakes and simulated scenario earthquakes of setting magnitudes.We identified the simulation results at virtual observation points in the study area through pulse identification and then obtained the velocity pulse distributions.The following three results were obtained:(1)Strong velocity pulses appear near the projection area of the fault on the surface,and it is crucial to con-sider the influence of velocity pulses on near-fault long-period buildings.(2)Magnitude affects the velocity-pulse distribution ranges by influencing the ground-motion amplitude.In this work,velocity pulses can only be identified when the peak velocity of long-period ground motion exceeds 20 cm/s.(3)The minimum value of the pulse period appears near the intersection between the fault and the surface,and the larger the magnitude,the longer the pulse period in the area.These results can be used for the seismic analysis of long-period structures and serve as a valuable refer-ence for the seismic-hazard analysis of construction megaprojects in the vicinity of the Anqiu-Juxian fault.
万方数据
维普
