TITLE:
Simulation of Dynamic Property for Wave Reflection in Basin over a Half Infinite Space by Staggered Grid RFFT Differentiation
AUTHORS:
Zhixin Zhao, Jiren Xu
KEYWORDS:
Late-Arrival Wave, Multireflection, Apparent Velocities, Frequency Band Widen, Peak Ground Motion, Damaging Buildings
JOURNAL NAME:
Open Journal of Geology,
Vol.5 No.5,
May
20,
2015
ABSTRACT: Simulations for seismic wave propagation in
the sedimentary basin over half-infinite rock space were performed in this
analysis. The results indicated that the basin shape in heterogeneous
structures affected wave dynamic characteristics in propagating. The refraction
wave from the rock brought the multireflection wave and the secondary surface
wave in the basin. The waves oscillating up-down within the basin shook the
buildings time after time resulting in heavy damage. The geometrical focusing
by basin corners and the physical interference between waves significantly
amplified the ground motions. The location of peak ground motion due to the
interference was attributable to the apparent velocity difference between the
secondary surface wave and the body wave. The late-arrival waves also resulted
in the peak ground motion. The frequencies of the late-arrival waves of
multireflection might cause dispersion. The late-arrival conversion waves with
various frequencies widened the frequency band of seismic input waves shaking
buildings and could seriously damage buildings with corresponding intrinsic
frequencies.