 |
Figure 1. Cartoon of the tectonic setting within which the study area
lies. The Juan de Fuca Plate is converging toward the North American Plate
at a rate of about 40-45 mm per year. This convergence results in subduction
of the oceanic Juan de Fuca Plate and crustal stress and strain being exhibited
in the continental North American Plate (Figs. 2 and 3). |
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Figure 2. Change in Baseline Length, Albert Head (western edge of the
study area, near Victoria) to Penticton (inland BC). The trend line shows
shortening of 5.9 mm/year. For more information on the Western Canada deformation
array, see http://www.pgc.nrcan.gc.ca/geodyn/wcda.htm |
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Figure 3. P-nodal solutions of crustal earthquakes of the Pacific Northwest
and southwestern British Columbia show a consistent pattern of margin-parallel,
north-south compression, perpendicular to the direction of subduction and
perpendicular to the observed strain measured in the GPS array as shown
in Figure 2 (see Wang, 2000). |