Abstract
Since 1990, an increased number of locations for the Lower Mainland of British Columbia has been listed in the Table of Climatic Data in the Supplements to the National Building Code of Canada. While for most of the new locations the seismic acceleration and velocity zones are shown as Za = Zv = 4, Ladner is listed with Za = 5, leading to significant cost increase in the construction of certain types of buildings. Although the zonal value is formally correct, it is suggested that such discrimination is not justified by the current precision of seismic hazard estimation.The Canadian National Committee on Earthquake Engineering does not address regional variances of this nature; it is, therefore, further suggested that a regional committee should decide on an equitable solution, with due consideration of estimated probabilities of exceeding ground motion parameters, and the precision of these estimates. Some of the background and details aiding such a decision are discussed. Key words: seismic hazard, acceleration, seismic zones, earthquake design, Vancouver acceleration.
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