CGRG Bibliography of Canadian Geomorphology
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Author : Cassidy, J.F.; Rogers, G.C.; Weichert, D.H.; and Little, T.E.
Date : 1997
Title : Strong ground motion records from the June 1997, Strait of Georgia earthquake.
Publication : Geological Survey of Canada, Open-File Report
Issue :
Page(s) :
Abstract
An earthquake of Mo=4.3 [ML=4.6] occurred on 24 June 1997 beneath the Strait of Georgia about midway between Vancouver, on the British Columbia mainland, and Nanaimo on Vancouver Island. This was a shallow thrust earthquake (3 km focal depth) that occurred along an approximately EW striking fault. This earthquake triggered 17 strong motion instruments in southwestern British Columbia, thus providing the largest single strong motion data set collected in this region to date. Peak ground accelerations ranged from 0.2%g to 2.4%g (224 cm/s2 ), at epicentral distances of 3387 km. This data set is significant because it includes the first bedrock recordings in the greater Vancouver area. These reference bedrock waveforms will allow for more accurate estimates of the site response at the Fraser River delta sites. This data set is also valuable as a comparison of these recordings with those of the 1996 Duvall earthquake, and the 1976 Pender Island earthquake, will provide insight into the differences between shallow crustal earthquakes at very different azimuths, and between shallow crustal, and deep oceanic plate earthquakes. In this Open File we present time series plots of the unprocessed digital data, as well as a comparison of the waveforms and spectra of some bedrock and soil recordings. Tabulated station parameters and peak accelerations are given together with maps of the network configurations showing the locations of triggered and untriggered instruments.
Bibliography of Canadian Geomorphology