scholarly journals Shear wave velocity measurement guidelines for Canadian seismic site characterization in soil and rock

2015 ◽  
Author(s):  
J A Hunter ◽  
H L Crow
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Measurement ◽  
Site Characterization ◽  
Seismic Site Characterization

scholarly journals Multi-method site characterization to verify the hard rock (Site Class A) assumption at 25 seismograph stations across Eastern Canada

2021 ◽  
pp. 875529302110010
Author(s):  
Sameer Ladak ◽  
Sheri Molnar ◽  
Samantha Palmer
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Hard Rock ◽  
Site Characterization ◽  
Eastern Canada ◽  
Site Class ◽  
Paleozoic Rock ◽  
Rock Types ◽  
Site Period

Site characterization is a crucial component in assessing seismic hazard, typically involving in situ shear-wave velocity ( VS) depth profiling, and measurement of site amplification including site period. Noninvasive methods are ideal for soil sites and become challenging in terms of field logistics and interpretation in more complex geologic settings including rock sites. Multiple noninvasive active- and passive-seismic techniques are applied at 25 seismograph stations across Eastern Canada. It is typically assumed that these stations are installed on hard rock. We investigate which site characterization methods are suitable at rock sites as well as confirm the hard rock assumption by providing VS profiles. Active-source compression-wave refraction and surface wave array techniques consistently provide velocity measurements at rock sites; passive-source array testing is less consistent but it is our most suitable method in constraining the rock VS. Bayesian inversion of Rayleigh wave dispersion curves provides quantitative uncertainty in the rock VS. We succeed in estimating rock VS at 16 stations, with constrained rock VS estimates at 7 stations that are consistent with previous estimates for Precambrian and Paleozoic rock types. The National Building Code of Canada uses solely the time-averaged shear-wave velocity of the upper 30 m ( VS30) to classify rock sites. We determine a mean VS30 of ∼ 1600 m/s for 16 Eastern Canada stations; the hard rock assumption is correct (>1500 m/s) but not as hard as often assumed (∼2000 m/s). Mean variability in VS30 is ∼400 m/s and can lead to softer rock classifications, in particular, for Paleozoic rock types with lower average rock VS near the hard/soft rock boundary. Microtremor and earthquake horizontal-to-vertical spectral ratios are obtained and provide site period classifications as an alternative to VS30.

Development Of a Bottom-Hole Device For Offshore Shear Wave Velocity Measurement

1978 ◽  
Author(s):  
K.H. Stokoe ◽  
E.J. Arnold ◽  
R.J. Hoar ◽  
D.J. Shirley ◽  
D.G. Anderson
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Measurement ◽  
Bottom Hole

A torsional vibration device for shear wave velocity measurement of coarse grained soils

Measurement ◽  
2019 ◽  
Vol 148 ◽  
pp. 106972 ◽  
Author(s):  
Degao Zou ◽  
Xingyang Liu ◽  
Jingmao Liu ◽  
Hao Zhang ◽  
Chenguang Zhou ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Torsional Vibration ◽  
Velocity Measurement ◽  
Coarse Grained

Shear Wave Velocity Measurement in the Centrifuge Using Bender Elements

2014 ◽  
Vol 37 (4) ◽  
pp. 20130189 ◽  
Author(s):  
Waleed El-Sekelly ◽  
Anthony Tessari ◽  
Tarek Abdoun
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Velocity Measurement ◽  
Bender Elements
Sign in / Sign up

Export Citation Format

Share Document