1-D and 2-D analyses of weak motion data in Fraser Delta from 1966 Duvall earthquake

Finn, W. D. Liam; Zhai, Endi; Thavaraj, Thuraisamy; Hao, X.-S; Ventura, Carlos E.

doi:10.1016/s0267-7261(02)00207-5

Cited by 21 publications

(8 citation statements)

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“…As in the case of antiplane shear, assembling Equation (33) (one matrix equation per layer) and accounting for Equations (39) and (40), the final system of equations for the irregular layered medium is cast in the same form as for a regular medium [4,41,42] and the final system of equations is obtained as…”

Section: Plane Strainmentioning

confidence: 99%

“…In such problems, the response of interest in layered soil deposits is in a 'low-frequency' (a few tenths to a few tens of Hz), 'longwavelength' (several meters to several hundreds of meters) range. Based on an expansion of motion in terms of semidiscrete wave modes [1,2] computed within the framework of the finite element method, the procedure for regular layered media has been implemented in computational tools such as FLUSH and SASSI (Lysmer et al [37,38]) and applied extensively (see the paper by Finn et al [39] and the report by Xu et al [40] for recent studies based on FLUSH and SASSI, respectively). The extension to be described herein will recognize and take advantage of stratification even in the presence of irregular layers.…”

Section: Introductionmentioning

confidence: 99%

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Wave computations in irregular layered media using a semidiscrete finite element perturbation method

Ikeda

Tassoulas

2008

Numerical Meth Engineering

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SUMMARYA technique that takes into account nonparallel interfaces and lateral inhomogeneities as perturbations with respect to a reference, horizontally layered, laterally homogeneous medium and produces approximations of the perturbed wave motion with little additional computation effort is described. The formulation combines a perturbation method with a semidiscrete finite element technique, providing an approximate treatment of wave propagation in irregular layered media. Consistent transmitting boundaries and other semidiscrete hyperelements as well as Green's functions, already available for regular layered media, can be reformulated within the framework of the method. The method is relevant in problems of foundation dynamics, ground response to seismic waves and site characterization. Example problems are presented toward evaluation of the effectiveness of the method.

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Section: Plane Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wave computations in irregular layered media using a semidiscrete finite element perturbation method

Ikeda

Tassoulas

2008

Numerical Meth Engineering

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“…26, top two graphs). (An extreme example of a rock reference site being far from the soil sites is in the paper by Finn et al, 2003, who used a reference site 62 km from the soil sites.) Yu and Haines [2003] also find that irrespective of the earthquake-to-earthquake variability, the rock sites near the valley have a site response relative to the rock site P01 (Fig.…”

Section: Soil/rock Ratios At Parkway New Zealandmentioning

confidence: 99%

Untitled

BOORE

2004

J. Earth. Eng.

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Large modifications of seismic waves are produced by variations of material properties near the Earth's surface and by both surface and buried topography. These modifications, usually referred to as "site response", in general lead to larger motions on soil sites than on rock-like sites. Because the soil amplifications can be as large as a factor of ten, they are important in engineering applications that require the quantitative specification of ground motions. This has been recognised for years by both seismologists and engineers, and it is hard to open an earthquake journal these days without finding an article on site response. What is often missing in these studies, however, are discussions of the uncertainty of the predicted response. A number of purely observational studies demonstrate that ground motions have large site-to-site variability for a single earthquake and large earthquake-location-dependent variability for a single site. This variability makes site-specific, earthquake-specific predictions of site response quite uncertain, even if detailed geotechnical and geological information is available near the site. Predictions of site response for average classes of sites exposed to the motions from many earthquakes can be made with much greater certainty if sufficient empirical observations are available.

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“…Realistic estimates of earthquake ground motion must account for all of these components. Previous 1D and 2D numerical modeling of earthquake response on the Fraser delta has concentrated on the effect of the relatively shallow soil layering: 1D analyses are based on vertical propagation of SH waves upward through a modeled column of the soil layering (thicknesses of investigated sites are 235 m in Molnar, 2011;300-700 m in Onur et al, 2004;unknown in Finn et al, 2003;and 500 and 700 m in Harris et al, 1998), and the 2D analysis is based on a cross section (30 km north-south extent of 100 m depth) of the Fraser River delta (Finn et al, 2003). Predicted amplification occurs at 0.2-0.4 Hz (first higher-order modes at 1.0-1.5 Hz) due to variable accumulations of Holocene deltaic and/or Pleistocene glacial sequences.…”

Section: Introductionmentioning

confidence: 99%

Earthquake Ground Motion and 3D Georgia Basin Amplification in Southwest British Columbia: Deep Juan de Fuca Plate Scenario Earthquakes

Molnar

Cassidy

Olsen

et al. 2014

Bulletin of the Seismological Society of America

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Finite-difference modeling of 3D long-period (> 2 s) ground motions for large (M w 6.8) scenario earthquakes is conducted to investigate effects of the Georgia basin structure on ground shaking in Greater Vancouver, British Columbia, Canada. Scenario earthquakes include deep (> 40 km) subducting Juan de Fuca (JdF) plate earthquakes, simulated in locations congruent with known seismicity. Two sets of simulations are performed for a given scenario earthquake using models with and without Georgia basin sediments. The chosen peak motion metric is the geometric mean of the two orthogonal horizontal components of motion. The ratio between predicted peak ground velocity (PGV) for the two simulations is applied here as a quantitative measure of amplification due to 3D basin structure.

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1-D and 2-D analyses of weak motion data in Fraser Delta from 1966 Duvall earthquake

Cited by 21 publications

References 1 publication

Wave computations in irregular layered media using a semidiscrete finite element perturbation method

Wave computations in irregular layered media using a semidiscrete finite element perturbation method

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Earthquake Ground Motion and 3D Georgia Basin Amplification in Southwest British Columbia: Deep Juan de Fuca Plate Scenario Earthquakes

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