| Titre | Earthquake site response studies using microtremor measurements in southwestern British Columbia |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Molnar, S; Cassidy, J F ; Monahan, P A; Onur, T; Ventura, C; Rosenberger, A |
| Source | Proceedings of the 9th Canadian Conference on Earthquake Engineering; 2007 p. 410-419, https://doi.org/10.4095/222230  Accès ouvert |
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| Année | 2007 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 20060065 |
| Séries alt. | Secteur des sciences de la Terre, produit d'information général 41 |
| Éditeur | Association canadienne du génie parasismique (Ottawa, ON, Canada) |
| Réunion | 9th Canadian Conference of Earthquake Engineering; Ottawa, ON; CA; juin 26-29, 2007 |
| Document | livre |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/222230 |
| Media | CD-ROM; en ligne; numérique |
| Formats | pdf (Adobe® Reader®) |
| Province | Colombie-Britannique |
| SNRC | 92G; 92J |
| Région | southwestern British Columbia; Vancouver; Whistler |
| Lat/Long OENS | -126.0000 -124.0000 51.0000 49.0000 |
| Sujets | secousses séismiques; risque de tremblement de terre; études séismiques; interpretations sismiques; risque sismique; sismicité; séismologie; séismologie des secousses fortes; géophysique |
| Illustrations | graphiques; sismogrammes |
| Programme | Réduction des risques dus aux aléas naturels |
| Diffusé | 2007 01 01 |
| Résumé | (disponible en anglais seulement)
In the linear range, the fundamental period and lower-bound estimate of site amplification can be easily determined from a single three-component seismic
instrument recording of microtremor (ambient noise), by the horizontal-to-vertical (h/v) spectral ratio method. Across southwestern British Columbia, this technique has been utilized for (1) validation with available earthquake records, (2) seismic
hazard
assessment projects, (3) soil-structure interaction studies, and (4) comparison with shear-wave velocity measurement techniques. Comparison of microtremor and earthquake response at sites across SW British Columbia, show similar peak
periods, and in Victoria, remarkably similar amplitudes. This validates the use of noise recordings for estimation of the fundamental period of a site to linear earthquake motion across SW British Columbia, as well as the estimated level of
amplification in greater Victoria. Seismic hazard assessments at 18 greater Victoria schools, across the Fraser River delta, and along a 10-km stretch of the Sea-to-Sky highway that links Vancouver to Whistler (sites of the 2010 Winter Olympic Games)
included the use of microtremor measurements for rapid and economical mapping of relative subsurface physical property variations. To investigate possible soil-structure interaction at five sites that host an earthquake recording instrument, noise
measurements were conducted both inside, and outside of the structure. The resulting fundamental period compared with available indoor, weak-motion earthquake recordings are similar, suggesting little soil-structure interaction. Furthermore,
examination of microtremor recordings made along a transect from the foundation of a 14-storey building to over 150 m away showed no deviation in site response. Comparison of microtremor response with shear-wave velocity measurement techniques are
presented in 9CCEE Paper 1173. |
| GEOSCAN ID | 222230 |
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