required measurement equipment. These testing methods, combined with Nakamura‟s method and the Frequency Domain Decomposition (FDD) result in a complete testing and analysis procedure that is effective and reliable [1]. This paper presents the results of an NSERC funded study of site response in selected regions of the Metro Vancouver region, in South-western British Columbia. In total, 212 measurements covering almost 400 square kilometers were performed and analysed for fundamental period using Nakamura‟s method and FDD. In addition, for some of the tests average values of ground velocity were also calculated. As a result of this study, it is possible to know, approximately, the fundamental period anywhere within the study area, specifically the Cities of Richmond and North Vancouver and the Districts of North Vancouver and West Vancouver. 2.0 Description of the Test 2.1 Overview of Study Area The study area is located within one of the most seismically active regions in Canada. Situated just east of the Cascadia subduction zone, Metro Vancouver is located within only one hundred and fifty of the expected location of a „mega thrust‟ earthquake [4]. Other faults in the vicinity of the region have produced crustal and subcrustal earthquakes that, because of the proximity to urban areas, could also generate significant ground shaking that could cause severe damage to the built environment. The entire area of the study is moderately to densely populated and, as a result, the effects of an earthquake are of great interest to municipalities and the provincial government. The study area can be divided into two regions; the City of Richmond (excluding Sea Island) in the south and three municipalities (City of North Vancouver, District of North Vancouver and District of West Vancouver) which are located north of the City of Vancouver and herein referred to as the North Shore. The study area can be seen in Figure 1. Fig. 1 Overview of Study Area 452
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