GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreShear wave measurements for earthquake response evaluation in Orleans, Ontario
TéléchargerTéléchargements
AuteurCrow, H; Pyne, M; Hunter, J A; Pullan, S E; Motazedian, D; Pugin, A
SourceCommission géologique du Canada, Dossier public 5579, 2007, 26 pages; 1 CD-ROM, https://doi.org/10.4095/223897 (Accès ouvert)
Année2007
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/223897
MediaCD-ROM; numérique; en ligne
Liensreadme
Formatsdat; pdf (Adobe® Acrobat® Reader® v.5.0 +); txt; zip
ProvinceOntario
SNRC31G/05NE; 31G/06NW; 31G/11SW; 31G/12SE
Lat/Long OENS -75.6000 -75.4333 45.5167 45.4167
Sujetsséismologie; secousses séismiques; diagraphie géophysique; trous de mine; méthodes sismiques; énergie sismique; levés de refraction sismiques; levés de reflexion sismiques; profils sismiques; ondes sismiques; ondes transversales; vitesse des ondes sismiques; analyses du temps de parcours; mécanique des sols; propriétés du sédiment; distribution des sédiments; dépôts postglaciaires; sédiments marins; sols; argiles; sables; silts; analyses stratigraphiques; épaisseur de la couverture meuble; topographie du substratum rocheux; vallées enfouies; codes du bâtiment; Holocène; Pléistocène; stabilité des pentes; glissements de pentes; glissements de terrain; Sédiments de Champlain Sea ; géophysique; géologie des dépôts meubles/géomorphologie; géologie de l'ingénieur; Phanérozoïque; Cénozoïque; Quaternaire
Illustrationstables; sketch maps; digital elevation models; schematic representations; photographs; geophysical images; plots; profiles; forms
ProgrammeRéduction des risques dus aux aléas naturels
Diffusé2007 06 01
Résumé(disponible en anglais seulement)
The Geological Survey of Canada and Carleton University collected shear wave data at 63 seismic sites in the Ottawa suburb of Orleans as part of the Eastern Canada Geohazards Assessment Project. Data collection techniques included reflection/refraction and landstreamer profiling. Previous collection and analysis of high-resolution borehole velocity logs in 18 borings in the Ottawa-Montreal area led to the definition of an average shear-wave velocity-depth function unique to these sediments. This formula, when applied to 835 borehole logs from within Orleans, was used to estimate a Vs30 value at each location, based on the soil type described in the log. The combined data from surface seismic sites and derived velocity-depth calculations were contoured to produce a Vs30 map of Orleans. Shear wave velocity and post-glacial thickness information was also used to produce a fundamental site period map.
High Vs30 values (>1500 m/s) were calculated in areas of thin overburden, and very low Vs30 values (<180 m/s) were obtained in areas underlain by thick deposits of post-glacial sediments. Of note is a buried bedrock valley with steep sides which extends in an elongate, NE-SW trend for approximately 2.5 km under Orleans. Borehole data alone did not clearly define the extent or depth of the clay-filled bedrock valley, which reached a depth of 95 meters in places. Due to the high velocity contrast between post-glacial sediments and bedrock in the Ottawa area, ongoing research is being carried out to address the unusually high soil amplification factors observed in the study area.
GEOSCAN ID223897