| Titre | Seismic hazard mapping in the Ottawa area, Ontario |
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| Auteur | Brooks, G ;
Hunter, J; Motazedian, D |
| Source | 4th Annual Canadian Risk and Hazards Network Symposium: abstracts and biographical sketches; 2007 p. 12 |
| Liens | Online - En ligne (page 12)
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| Image |  |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20070064 |
| Éditeur | CRHNet |a Canada (Canada) |
| Réunion | 4th Annual Canadian Risk and Hazards Network Symposium; Vancouver, BC; CA; Novembre 6-8, 2007 |
| Document | livre |
| Lang. | anglais |
| Media | papier; en ligne; numérique |
| Formats | pdf (Adobe® Reader®) |
| Programme | Réduction des risques dus aux aléas naturels |
| Résumé | (disponible en anglais seulement)
The shaking experienced at a given site during an earthquake can be amplified significantly depending on the local geologicalgeotechnical properties of the
underlying soil. Recent changes to the National Building Code of Canada (NBCC) 2005 have introduced descriptions of site categories that take into account the thickness and stiffness of a soil and provide estimates of the relative amount of
amplification from seismic shaking. These site categories can be defined using three-dimensional geological and geophysical data, but also mapped to reveal the spatial variability of the seismic amplification hazards. The Geological Survey of Canada
is mapping the NBCC site categories within the City of Ottawa, Ontario, by collecting and compiling geophysical, geotechnical and geological data.
Mapping has now been completed for about one-third of the City, based on a digital database of over
28 000 boreholes, and over 340
surface and downhole geophysical measurements. Preliminary maps for the Orleans suburb of Ottawa reveal that large variations in
seismic amplification can occur over 0.5 to 1 km distances, reflecting the presence
of thick deposits of soft glaciomarine sediments that
overlie steep-sided, buried bedrock valleys. Such maps can contribute to enhancing emergency response plans, improving earthquake
hazard mitigation strategies, and developing urban plans
that avoid amplification susceptible terrain. Mapping is scheduled for
completion by March 31, 2009. |
| GEOSCAN ID | 223808 |
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