Multi-method site characterization to verify the hard rock (Site Class A) assumption at 25 seismograph stations across Eastern Canada
نویسندگان
چکیده
Site characterization is a crucial component in assessing seismic hazard, typically involving situ shear-wave velocity ( V S ) depth profiling, and measurement of site amplification including period. Noninvasive methods are ideal for soil sites become challenging terms field logistics interpretation more complex geologic settings rock sites. Multiple noninvasive active- passive-seismic techniques applied at 25 seismograph stations across Eastern Canada. It assumed that these installed on hard rock. We investigate which suitable as well confirm the assumption by providing profiles. Active-source compression-wave refraction surface wave array consistently provide measurements sites; passive-source testing less consistent but it our most method constraining . Bayesian inversion Rayleigh dispersion curves provides quantitative uncertainty succeed estimating 16 stations, with constrained estimates 7 previous Precambrian Paleozoic types. The National Building Code Canada uses solely time-averaged upper 30 m to classify determine mean ? 1600 m/s stations; correct (>1500 m/s) not often (?2000 m/s). Mean variability ?400 can lead softer classifications, particular, types lower average near hard/soft boundary. Microtremor earthquake horizontal-to-vertical spectral ratios obtained period classifications an alternative
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ژورنال
عنوان ژورنال: Earthquake Spectra
سال: 2021
ISSN: ['1944-8201', '8755-2930']
DOI: https://doi.org/10.1177/87552930211001076