Hazard Calculators - Determine seismic hazard at your site; Simplified seismic hazard map of Canada, the provinces and territories; 2015 National Building Code of Canada seismic hazard maps; Background information on seismic hazard calculations; Why earthquake risk assessments are important! 2 shows the subduction source, which is a line-source associated with high-magnitude events. It should be noted that the CDA guidelines are more a state of practice recommendations than an actual law and they do not provide hazard values for different locations but rather propose a minimum annual exceedance probability of the natural hazard (recurrence). A "robust" method is used to combine the model results: the mapped value is the largest of the four values. Le remblai présente un potentiel de liquéfaction puisque le CSR est toujours plus élevé que le CRR. The analyses reveal substantial risk aversion in the current designs when the direct cost of damage is considered. For Canada, details of the national seismic hazard maps, which form the basis of seismic design provisions of the current National Building Code of Canada (NBCC2005), were given by, ... PSHA combines the hazard contributions of the seismic source zones affecting the site. However they interact with their bounding frame under seismic actions resulting in significant changes in the dynamic properties of the building, which can lead to structural damage and increased floor accelerations. The map is a simplification of the National Building Code of Canada seismic hazard map for spectral acceleration at a 0.2 second period (5 cycles per second), and shows the ground motions that might damage one- to two-storey buildings. The characterization of elastic seismic demand in terms of the pseudo-spectral acceleration (PSA) can be obtained by carrying out probabilistic seismic hazard analysis that incorporates earthquake occurrence models, seismic source zones, magnitude-recurrence relations, and ground motion prediction equations (GMPE) (Panel 1 in Figure 1). The effects of seismic retrofit and infill walls on the dynamic properties and seismic response of the buildings were addressed by comparing the results of different numerical models. On discute les conséquences pour la conception géotechnique, le microzonage et le risque urbain. The buildings were designed in accordance with the National Building Code of Canada. Developments in seismic hazard analysis over the last few decades are overviewed, and a perspective is presented on current issues and new developments. The uncertainties associated with the probability estimations are discussed and quantified by providing upper and lower boundaries for selected calculations. Results presented in this paper are intended to enable officials and the public to better identify and understand the earthquake threat in their communities. NEHRP site conditions are mapped for all of Canada from existing geological data, and NEHRP site factors are used to account for local site conditions. Deaggregation for a range of probabilities and spectral. Spectral-value and peak-acceleration maps and Uniform Hazard Spectra for main cities have been produced for median (50th percentile) ground motions at a 10% and a 2% probability of exceedence in 50 years. The analysis shows that a large landslide in sensitive clay can occur after a number of seasonal erosion cycles with no obvious trigger. Spectral acceleration is contoured in g. Spectral acceleration for a period of 0.5 seconds at a probability of 2%/50 years for firm ground conditions (NBCC Site Class C). In particular, the calculated spectral floor values have been recalculated. L'effet de la géométrie sur la réponse spectrale en 1D est ajusté par un facteur d'amplification de 2. The intensity of the seismic excitations is represented by the spectral acceleration at the fundamental structural period of the frames. While there is general agreement in relative hazard levels, as shown by comparing hazard between Canadian and appropriate U.S. cities, hazard contours do not necessarily match across the border. (1997) for interface and intraslab subduction earthquakes, which were adopted by, ... For numerical analysis, a set of 1000 hypothetical buildings located in Vancouver (49.2°N, 123.2°W) is considered. Spectral acceleration is contoured in g. Spectral acceleration for a period of 1.0 seconds at a probability of 2%/50 years for firm ground conditions (NBCC Site Class C). To address this, earthquake shaking probabilities were calculated for over 600 communities, The Geological Survey of Canada's new seismic hazard model for Canada forms the basis for the seismic design provisions of the 2005 National Building Code of Canada (NBCC). As such it will produce Canada's fourth generation of official seismic hazard maps. The proposed approach demonstrates good modelling capability with respect to the earthquake-engineering-based model, and is useful for more complex risk management problems. The catastrophic nature of seismic risk resides in the fact that a group of structures and infrastructure is simultaneously excited by spatially correlated seismic loads due to an earthquake: thus, both inter-event and intra-event correlations of ground motion measures must be taken into account. Unreinforced masonry (URM) infill walls are extensively used in buildings; they are normally considered as nonstructural components and their structural effects are often neglected in seismic analysis. Les trois méthodes employées sont: 1-la méthode simplifiée d'Idriss et Boulanger (2008), 2-une modélisation numérique 1D non-linéaire avec FLAC et 3-une analyse numérique 2D en équivalence linéaire avec QUAKE/W de la suite Geo-Studio. Spectral acceleration for a period of 1.0 s in southeastern Canada at a probability of 2% per 50 years for firm ground conditions (National Building Code of Canada (NRCC 2005) soil class C), drawn from data obtained from, ... Three generations of seismic hazard maps for Canada have been produced at roughly 15-year intervals (1953,1970,1985), and a fourth generation is now justified because there is sufficient new information available to improve the hazard estimates (Basham, 1995). For the seismic provisions of the 2005 National Building Code of Canada the median ground motion on firm soil sites for spectral acceleration at periods of 0.2, 0.5, 1.0 and 2.0 seconds and peak acceleration will be used. The results lead to probabilistic tools to assess the performance of buildings designed following the National Building Code of Canada in different years of construction with and without irregularities. accelerations (Sa) from 0.2 to 2.0 seconds is performed to examine in detail the hazard for two of Canada's largest urban centres at high risk, Vancouver in the west and Montreal in the east. Return periods associated with 2% and 10% probability in 50-year hazard values for spectral accelerations for Ottawa and Vancouver were obtained from Geological Survey of Canada. This paper presents a subset of these calculations for 25 communities. On the maps, seismic hazard is expressed as the most powerful ground motion that is expected to occur in an area for a given probability level. We deaggregate the seismic hazard results for selected cities to help understand the relative contributions of the earthquake sources in terms of distance and magnitude. The four spectral parameters will allow the construction of approximate UHS for each locality, and hence improve earthquake-resistant design. The three probabilistic parts of the model use two complete earthquake source models and a separate estimate for the stable part of Canada to represent the uncertainty in where (and why) earthquakes will happen in the future. To read the full-text of this research, you can request a copy directly from the authors. The three approaches are: 1-a preliminary semi-empirical method based on Idriss & Boulanger (2008), 2-a 1D nonlinear Finite Difference Method site response with FLAC and 3-a 2D equivalent linear Finite Element Method analysis with QUAKE/W. The ground shaking intensities for the current National Building Code of Canada, NBCC-1995 and the upcoming NBCC-2005 were calculated by the Geological Survey of Canada (GSC) and documented in [6] and [7], respectively. The probabilities of "structurally" damaging ground shaking due to crustal or subcrustal earthquakes occurring within the next 50 years in the two largest cities of BC, Vancouver and Victoria, are 12% and 21%, respectively. The different physical properties of the crust in eastern and western Canada and the different nature of the earthquake sources in southwestern Canada required the use of four separate strong ground motion relations as detailed by, ... At present, the Cornell-McGuire method is the most widely used method for site-specific analysis worldwide, and is used in the Canadian national seismic hazard maps (Basham et al. : RC frame structure may suffer different levels of damage under seismic-induced ground motions, with potentials for formation of hinges in structural elements, depending on the level of stringency in design. We adapt the experience and methods used for Canadian seismic hazard maps to present, for the first time, probabilistic spectral hazard maps for Albania. Spectral acceleration at 0.2, 0.5, 1.0 and 2.0 second periods and peak acceleration form the basis of the seismic provisions of the 2005 National Building Code of Canada.