CGRG Bibliography of Canadian Geomorphology
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Author : Harris, J.B.; Hunter, J.A.; Pullan, S.E.; Good, R.l.; Burns, R.A.; Miller, R.D.; Xia, J.; Park, C.B.; Laflen, D.R.; Payne, K.M.; and Candy, C.E.
Date : 2002.
Title : Application of shear wave seismic reflection profiling to earthquake hazard studies of the Fraser River Delta, British Columbia, Canada.
Publication : Seismological Society of America 2002, Annual Meeting 17-19 April 2002. Victoria Conference Centre, Victoria, British Columbia
Issue :
Page(s) :
Abstract
Determining of the depth, shape, and velocity contrast of the Holocene/Pleistocene and Pleistocene/Tertiary boundaries beneath the Fraser River delta in southwestern British Columbia, Canada, is critical for accurate modeling of seismically-induced ground motions. Shallow shear wave reflection surveys provide information about the Tertiary bedrock surface and Quaternary sediments of the Fraser River delta. Besides the clear advantage of shear wave profiling in this shallow, gas-rich environment, the added resolution potential and ability to measure the shear wave velocity field enhances the utility of this surface seismic data in earthquake site response estimations. Surface materials ranging from undisturbed, native delta sediments to clay/rubble fill used in dike construction were amenable to the generation and recording of shear waves using both sledgehammer/I-beam and a small (6,000 kg) vibratory energy source. The structure of the Pleistocene surface, depth to Tertiary bedrock, and shallow shear-wave velocity field were determined at numerous locations within the delta where gaps existed in the geologic record. The sledgehammer data set produced clear images of the Holocene/Pleistocene boundary in several locations, and the shear wave vibroseis data provide crucial information on the depth to Tertiary bedrock in the heavily populated, northwestern part of the delta (beneath the city of Richmond), where the existing bedrock map is questionable due to lack of seismic coverage.
Bibliography of Canadian Geomorphology