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TitleBayesian inversion of microtremor array dispersion data for vs structure on the Fraser River Delta, British Columbia
AuthorMolnar, S; Dosso, S E; Cassidy, J F
SourceProceedings of the 9th U.S. National and 10th Canadian Conference on Earthquake Engineering/Compte Rendu de la 9ième Conférence Nationale Américaine et 10ième Conférence Canadienne de Génie Parasismique; 762, 2010, 8 pages
Alt SeriesEarth Sciences Sector, Contribution Series 20090269
Meeting9th US Conference on Earthquake Engineering / 10th Canadian Conference on Earthquake Engineering; Toronto, On; CA; July 25-29, 2010
RelatedThis publication is contained in Adams, J; Halchuk, S; Awatta, A; Adams, J; Halchuk, S; Awatta, A; (2010). Estimated seismic design values for Canadian missions abroad, Proceedings of the 9th U.S. National and 10th Canadian Conference on Earthquake Engineering
ProvinceBritish Columbia
AreaFraser River Delta; Fraser River
Lat/Long WENS-123.5000 -123.0000 49.2500 49.0000
Subjectsgeophysics; velocity surveys; seismic velocities; seismic surveys; seismic interpretations
Illustrationsgraphs; plots
ProgramTargeted Hazard Assessments in Western Canada, Public Safety Geoscience
AbstractThis paper develops a Bayesian inversion approach to estimate the subsurface shear-wave velocity profile from microtremor array dispersion data, which is applied to a site on the Fraser River delta, British Columbia. Microtremors were recorded using an array of five seismographs set in an expanding series of apertures between 5-10 m and 160-180 m that provided phase velocity values over the frequency band of 1.2 to 6.7 Hz. The shear-wave velocity model parameterization is assessed using the Bayesian information criterion, which indicates a power law depth relation. Excellent agreement is obtained between the inversion result (optimal VS profile with 95% credibility interval) and the average VS profile determined from invasive methods (down-hole and seismic cone penetration testing) to over 100 m depth.