In a recent study (Dineva et al., 2007; hereinafter DEA), we established a spatial correlation between the earthquake sequence of 20–24 October 2005 in Georgian Bay (Ontario, Canada) and magnetic anomalies that are most likely caused by mafic dykes. The strike of both determined nodal planes of the mainshock (mN 4.3) are consistent with the strike of the magnetic anomalies. Focal depths of the earthquake sequence are estimated to be in the range 5–12 km, mostly around 10–12 km. Assuming a highly simplified rheological model that incorporates a quartz-dominated host lithology and a plagioclase composition...
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