Neotectonic stress orientation indicators in southwestern British Columbia
- 1 January 1996
- report
- Published by Natural Resources Canada/CMSS/Information Management
Abstract
Possible indicators for in situ rock stress orientation were identified and analyzed in roadcuts and on glacier forefields in southwestern British Columbia as part of the Geological Survey of Canada's Cordilleran Neotectonic Map Project. A particular effort was made to obtain readings from plutonic and high-grade metamorphic rocks of the Southern Coast Belt and the Omineca Belt. At all sites, great care had to be taken in order to avoid measuring features that could have been influenced by rock fabric, pre- Pleistocene structures, or local topography. Data were gathered from offset preshear boreholes, axial fractures propagated from preshear boreholes, and stress-controlled breakage fractures in artificial roadcuts, and from neotectonic faults, hairline fractures, and glacial neotectonic plucking fractures on glacier forefields.Keywords
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