Development of Deep Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand

Deschenes, Michael R.; Wood, Charles D.; Wotherspoon, Liam; Bradley, Brendon; Thomson, Ethan

doi:10.1193/122717eqs267m

Cited by 16 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using V S profiles that extend to bedrock has been shown to be critical to properly estimating the ground motions for sites within the Mississippi Embayment (Cramer et al 2004, Hashash and Park 2001). For further information regarding the data collection or processing, please see Wood et al (2014) or Deschenes et al (2018).…”

Section: Site Response Methodologymentioning

confidence: 99%

Cost Savings of Implementing Site-Specific Ground Motion Response Analysis in the Design of Short-Period Mississippi Embayment Bridges

Wood

Baker

2018

Earthquake Spectra

Self Cite

View full text Add to dashboard Cite

Deep dynamic site characterization and a site-specific ground motion response analysis (SSGMRA) were conducted for a bridge site in Monette, Arkansas. The SSGMRA indicated the design acceleration response spectrum determined using the American Association of State Highway and Transportation Officials (AASHTO) general seismic procedure could be reduced by one third for the short-period range due to attenuation of the short-period ground motions. The steel girder pile-bent bridge, originally designed using the AASHTO general seismic design procedure, was redesigned using the updated seismic demands estimated from SSGMRA. A cost-savings analysis was then conducted to determine the potential savings associated with conducting the SSGMRA. By designing based on the results of the SSGMRA, a potential gross savings of $205,000, or 7% of the original bridge construction cost, could be achieved for the study bridge. Items that contributed most to the cost savings were the pile and embankment construction.

show abstract

Section: Site Response Methodologymentioning

confidence: 99%

Cost Savings of Implementing Site-Specific Ground Motion Response Analysis in the Design of Short-Period Mississippi Embayment Bridges

Wood

Baker

2018

Earthquake Spectra

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, there are several disadvantages to the use of the volcanic rock (or deeper layers) as reference layer(s) in ground-response analysis for the Christchurch earthquake. First, with the exception of some recent efforts in developing deep (>500 m) V s profiles for selected Christchurch sites (Deschenes et al, 2018; Teague et al, 2018), the vast majority of site investigations in Christchurch do not exceed depths greater than 20–30 m from the ground surface. As a result, for most sites of interest the soil profile properties between 30 m depth and the volcanic rock (or deeper layers) are not known with sufficient detail.…”

Section: Step 1: Determination Of Reference Layermentioning

confidence: 99%

Challenges in the definition of input motions for forensic ground-response analysis in the near-source region

2021

View full text Add to dashboard Cite

This article scrutinizes the determination of input motions for forensic ground-response analysis in the near-source region, based on recorded surface ground motions at strong-motion station sites, from the same event. The first part of the article draws upon observed ground motions from the 22 February 2011 6.2 Mw Christchurch earthquake to discuss key challenges of the problem associated with the strong spatial variation of ground motion in the near-source region. Effects from the complexity of the rupture, propagation of seismic waves through complex geological structures, and site characteristics are explored. It is argued that, because of the strongly varying source-path “signature” on near-source ground motions, “reference” input motions for ground-response analysis must be specific to, and have similar signature characteristics (be “compatible”) with, the target site which is subject to the analysis. The second part of the article presents a four-step procedure for the derivation of site-specific input motions involving (1) determination of the reference layer where the input motion is to be applied in the analysis, (2) record selection considering the appropriateness of the recording station site for deconvolution and its compatibility with the target site, (3) deconvolution of the selected record to remove local site effects from the recorded ground motion, and (4) scaling of the deconvolved motion to account for differences in the source-to-site distance between the recording station and the target site. As part of the proposed procedure, a novel (amplitude-duration) scaling method is presented. Results from one-dimensional (1D) effective-stress analysis of two target Christchurch sites using input motions from the proposed procedure are used to critically evaluate the procedure and discuss essential requirements for its successful application.

show abstract

“…Figure A.1 in Supplemental Appendix A illustrates shear wave velocity ( V S ) profiles of the 20 sites based on site investigation results from Wotherspoon et al (2014), Deschenes et al (2018), and Jeong and Bradley (2017a). Wotherspoon et al (2014) also performed detailed site investigations at most of the sites, including surface wave testing (using active and passive methods), cone penetration tests (CPTs), standard penetration tests (SPTs), and laboratory index tests.…”

Section: Earthquakes and Sites Consideredmentioning

confidence: 99%

Modeling nonlinear site effects in physics-based ground motion simulations of the 2010–2011 Canterbury earthquake sequence

2020

View full text Add to dashboard Cite

This study examines the performance of nonlinear total stress one-dimensional (1D) wave propagation site response analysis for modeling site effects in physics-based ground motion simulations of the 2010–2011 Canterbury, New Zealand earthquake sequence. This approach explicitly models three-dimensional (3D) ground motion phenomena at the regional scale, and detailed site effects at the local scale. The approach is compared with a more commonly used empirical VS30-based method of computing site amplification for simulated ground motions, as well as prediction via an empirical ground motion model. Site-specific ground response analysis is performed at 20 strong motion stations in Christchurch for 11 earthquakes with 4.7≤ MW≤7.1. When compared with the VS30-based approach, the wave propagation analysis reduces both overall model bias and uncertainty in site-to-site residuals at the fundamental period, and significantly reduces systematic residuals for soft or “atypical” sites that exhibit strong site amplification. The comparable performance in ground motion prediction between the physics-based simulation method and empirical ground motion models suggests the former is a viable approach for generating site-specific ground motions for geotechnical and structural response history analyses.

show abstract

Development of Deep Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand

Cited by 16 publications

References 36 publications

Cost Savings of Implementing Site-Specific Ground Motion Response Analysis in the Design of Short-Period Mississippi Embayment Bridges

Cost Savings of Implementing Site-Specific Ground Motion Response Analysis in the Design of Short-Period Mississippi Embayment Bridges

Challenges in the definition of input motions for forensic ground-response analysis in the near-source region

Modeling nonlinear site effects in physics-based ground motion simulations of the 2010–2011 Canterbury earthquake sequence

Contact Info

Product

Resources

About