CGRG Bibliography of Canadian Geomorphology
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Author : Adams, J.
Date : 1998.
Title : Fourth generation seismic hazard maps for Canada.
Publication : Proceedings, Sixth U.S. National Conference on Earthquake Engineering [computer file], Earthquake Engineering Research Inst., Oakland, California, 1998.
Issue :
Page(s) : 11 p.
Abstract
The Geological Survey of Canada released a suite of new hazard maps for public comment in 1996. These maps are intended to form the basis for seismic design codes in the year 2000 edition of the National Building Code of Canada. As such, they will be Canada’s fourth generation of seismic hazard maps (previous ones were in 1953, 1970, 1985). The Cornell-McGuire method is retained, except that two complete earthquake source models are used to represent the uncertainty in where (and why) earthquakes will happen in the future. To capture the lack of knowledge in the east, one model assumes that the historical pattern will repeat itself, while the other allows earthquakes like those that have happened in the past to occur in geologically similar, though hitherto seismic regions (e.g. Trois Rivieres). A “robust” or “quasi-probabilistic” method is used to combine the probabilistic estimates from the two source models and from a deterministic estimate for Cascadia subduction earthquake ground motions: the mapped value is the largest of the values determined from these three sources. Examples of the new Canadian maps, median spectral accelerations at periods of 0.2 and 1.0 seconds for a 10% probability of exceedance in 50 years, are presented. An inter-comparison is made of the relative hazard levels between representative Canadian and US cities, both east and west. Cross-border differences with the recent USGS hazard results are highlighted, and their reasons explained when evident.
Bibliography of Canadian Geomorphology