Abstract
Abstract The “weights of evidence” statistical method, previously applied to the problem of relating mineral occurrences to geological and geomorphological features, has been applied to the question of whether in a particular area there may be a spatial correlation between seismic epicenters and various geological and geophysical parameters. We find that seismicity in western Quebec is associated with NNE-trending drainage features and positive aeromagnetic anomalies. Our interpretation is that NNE-trending zones of weakness are being re-activated in the presence of a NE-SW regional compressive stress field and that less competent zones in the upper crust, as delineated by positive aeromagnetic anomalies, are causing stress and, hence, seismicity to be concentrated in the subjacent middle crust.
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