O'Neill, David A.2023-06-072023-06-071985https://unbscholar.lib.unb.ca/handle/1882/30244Granodiorite samples taken from the epicentre of the 1982 Miramichi earthquake sequence reveal a parallel network of Mode I (tensile) fractures. These fractures have a marked effect on the mechanical properties of the material as determined by laboratory testing. The action of stress cycling produces a pronounced decrease in strength of the material as permanent strain is accumulated by dilatant behavior. The micro-fractures are believed to have formed in response to a stress regime whose maximum principal stress orientation is approximately horizontal, east-west trending and whose minimum principal stress is vertical.viii, 151 pageselectronicen-CAhttp://purl.org/coar/access_right/c_16ecsenior reportEarth Sciences