Effect of vertical velocity gradient on ground motion in a sediment-filled basin due to incident SV wave

Yanbin Wang, Hiroshi Takenaka, Takashi Furumura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The natural sedimental deposits in basins show strong vertical heterogeneity in their material parameters. The aim of this paper is to investigate the effects of such vertical heterogeneity, especially vertical velocity gradient, inside basin on the seismic ground motion through the parametric study on the response of a two-dimensional semi-cylindrical sediment-filled basin to a vertical incidence of plane SV wave using the pseudospectral method. This numerical study has tried to find the effects caused by vertical velocity gradient through the use of synthetic seismograms, wavefield snapshots and surface amplitude distribution. Simulation results clearly demonstrate the detailed character of wave propagation phenomena in basins with vertical velocity gradient, which produces characteristic amplification pattern of the surface motion caused mainly by the generation of strong Rayleigh wave induced at the basin edge associated with large lateral velocity change across the basin edge. Amplification pattern at the surface strongly depends on both the vertical velocity gradient in the basin and the predominant frequency of the incident wave. Although similar phenomena on wave propagation and surface motion found in previous studies for homogeneous basin models have also been observed in this study, it has been found that the vertical velocity gradient enhances such phenomena. The results suggest that it is important to represent the vertical velocity profiles accurately when we construct a structural model for realistic modelling of ground motion.

Original languageEnglish
Pages (from-to)13-24
Number of pages12
JournalEarth, Planets and Space
Volume52
Issue number1
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

ground motion
sediments
gradients
basin
sediment
wave propagation
amplification
effect
synthetic seismogram
seismograms
Rayleigh waves
Rayleigh wave
velocity profile
plane waves
velocity distribution
incidence
deposits
modeling
simulation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Effect of vertical velocity gradient on ground motion in a sediment-filled basin due to incident SV wave. / Wang, Yanbin; Takenaka, Hiroshi; Furumura, Takashi.

In: Earth, Planets and Space, Vol. 52, No. 1, 2000, p. 13-24.

Research output: Contribution to journalArticle

@article{15ad1a61253c477dbf2c79dbac49ae8f,
title = "Effect of vertical velocity gradient on ground motion in a sediment-filled basin due to incident SV wave",
abstract = "The natural sedimental deposits in basins show strong vertical heterogeneity in their material parameters. The aim of this paper is to investigate the effects of such vertical heterogeneity, especially vertical velocity gradient, inside basin on the seismic ground motion through the parametric study on the response of a two-dimensional semi-cylindrical sediment-filled basin to a vertical incidence of plane SV wave using the pseudospectral method. This numerical study has tried to find the effects caused by vertical velocity gradient through the use of synthetic seismograms, wavefield snapshots and surface amplitude distribution. Simulation results clearly demonstrate the detailed character of wave propagation phenomena in basins with vertical velocity gradient, which produces characteristic amplification pattern of the surface motion caused mainly by the generation of strong Rayleigh wave induced at the basin edge associated with large lateral velocity change across the basin edge. Amplification pattern at the surface strongly depends on both the vertical velocity gradient in the basin and the predominant frequency of the incident wave. Although similar phenomena on wave propagation and surface motion found in previous studies for homogeneous basin models have also been observed in this study, it has been found that the vertical velocity gradient enhances such phenomena. The results suggest that it is important to represent the vertical velocity profiles accurately when we construct a structural model for realistic modelling of ground motion.",
author = "Yanbin Wang and Hiroshi Takenaka and Takashi Furumura",
year = "2000",
language = "English",
volume = "52",
pages = "13--24",
journal = "Earth, Planets and Space",
issn = "1880-5981",
publisher = "Terra Scientific Publishing Company",
number = "1",

}

TY - JOUR

T1 - Effect of vertical velocity gradient on ground motion in a sediment-filled basin due to incident SV wave

AU - Wang, Yanbin

AU - Takenaka, Hiroshi

AU - Furumura, Takashi

PY - 2000

Y1 - 2000

N2 - The natural sedimental deposits in basins show strong vertical heterogeneity in their material parameters. The aim of this paper is to investigate the effects of such vertical heterogeneity, especially vertical velocity gradient, inside basin on the seismic ground motion through the parametric study on the response of a two-dimensional semi-cylindrical sediment-filled basin to a vertical incidence of plane SV wave using the pseudospectral method. This numerical study has tried to find the effects caused by vertical velocity gradient through the use of synthetic seismograms, wavefield snapshots and surface amplitude distribution. Simulation results clearly demonstrate the detailed character of wave propagation phenomena in basins with vertical velocity gradient, which produces characteristic amplification pattern of the surface motion caused mainly by the generation of strong Rayleigh wave induced at the basin edge associated with large lateral velocity change across the basin edge. Amplification pattern at the surface strongly depends on both the vertical velocity gradient in the basin and the predominant frequency of the incident wave. Although similar phenomena on wave propagation and surface motion found in previous studies for homogeneous basin models have also been observed in this study, it has been found that the vertical velocity gradient enhances such phenomena. The results suggest that it is important to represent the vertical velocity profiles accurately when we construct a structural model for realistic modelling of ground motion.

AB - The natural sedimental deposits in basins show strong vertical heterogeneity in their material parameters. The aim of this paper is to investigate the effects of such vertical heterogeneity, especially vertical velocity gradient, inside basin on the seismic ground motion through the parametric study on the response of a two-dimensional semi-cylindrical sediment-filled basin to a vertical incidence of plane SV wave using the pseudospectral method. This numerical study has tried to find the effects caused by vertical velocity gradient through the use of synthetic seismograms, wavefield snapshots and surface amplitude distribution. Simulation results clearly demonstrate the detailed character of wave propagation phenomena in basins with vertical velocity gradient, which produces characteristic amplification pattern of the surface motion caused mainly by the generation of strong Rayleigh wave induced at the basin edge associated with large lateral velocity change across the basin edge. Amplification pattern at the surface strongly depends on both the vertical velocity gradient in the basin and the predominant frequency of the incident wave. Although similar phenomena on wave propagation and surface motion found in previous studies for homogeneous basin models have also been observed in this study, it has been found that the vertical velocity gradient enhances such phenomena. The results suggest that it is important to represent the vertical velocity profiles accurately when we construct a structural model for realistic modelling of ground motion.

UR - http://www.scopus.com/inward/record.url?scp=0034022232&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034022232&partnerID=8YFLogxK

M3 - Article

VL - 52

SP - 13

EP - 24

JO - Earth, Planets and Space

JF - Earth, Planets and Space

SN - 1880-5981

IS - 1

ER -