| Titre | Strong motion seismograph networks in southwest British Columbia - data, and recent applications |
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| Auteur | Cassidy, J F ;
Rosenberger, A; Rogers, G C; Molnar, S |
| Source | Seismological Research Letters vol. 78, no. 2, 2007 p. 292 |
| Année | 2007 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20060593 |
| Réunion | Seismological Society of America Annual Meeting; Waikoloa, Hawaii; US; avril 11-13, 2007 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier |
| Province | Colombie-Britannique |
| SNRC | 92B; 92G |
| Région | Vancouver; Victoria; Fraser River delta; Fleuve Fraser |
| Lat/Long OENS | -124.0000 -122.0000 50.0000 48.0000 |
| Sujets | interpretations sismiques; sismicité; sismographes; réseau sismique; séismologie des secousses fortes; séismologie; secousses séismiques; études séismiques; risque de tremblement de terre; géophysique;
géologie de l'ingénieur |
| Programme | Réduction des risques dus aux aléas naturels |
| Diffusé | 2007 01 01 |
| Résumé | (disponible en anglais seulement)
Strong motion monitoring has undergone a major transformation in Canada in recent years. Most analogue, non-communicating instruments have been replaced with
modern digital instruments connected to the internet that provide information in real-time. Dense networks are being deployed in the urban centres of southwest British Columbia to provide shaking parameters (PGA, PGV and spectral intensity) and
shaking maps immediately after an earthquake. As of 2007, the Geological Survey of Canada operates nearly 100 low-cost, low-maintenace, robust strong motion instruments designed for the urban environment (Internet Acclerometers or IAs) in southwest
BC. Most are deployed in the urban centres of Vancouver and Victoria. In addition, other organisations, including BC Hydro, BC Transmission Corporation, BC Ministry of Transportation and Highways, and Terasen Gas operate an additional 43 instruments
in the region to monitor critical infrastructure, including bridges, dam sites, transmission facilities, and a LNG plant. This dense strong motion network is providing much larger data sets than was previously available. During the past four years,
nearly 200 three component accelerograms have been recorded in southwestern BC (that is more than was recorded during the previous three decades). To date, these records represent weak motion (PGA less than 5%g). Nonetheless, the quanitity (typically
on the order of 100 records per event rather than a dozen records) and quality of these recordings are proving extremely useful for a range of scientific problems. Recent applications include: 1) mapping earthquake site response across greater
Victoria, and greater Vancouver (including the Fraser River delta); 2) evaluating regional attenuation relationships, and; 3) examining wave propagation across Vancouver using recordings of a large local blast. Future plans include using the strong
motion data to better constrain local earthquake locations, depths and focal mechanisms. |
| GEOSCAN ID | 223373 |
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