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The seismic stations of the SOSN network are all located in a region of Southwestern Ontario which has high cultural noise. The archiving procedure which was adopted is to save all seismic events which are recorded on at least two stations. Events which are observed on only one station are assumed to be either of cultural origin (traffic, farm machinery, trains, wind, thunderstorms etc) or too weak to be of tectonic significance. Experience has shown that only events of magnitude larger than 1 can be detected by more than one station of the SOSN network and at least three stations must detect an event before a reliable location can be determined. The location of almost all the events shown in this report are obtained by the Geological Survey of Canada using conventional methods. Tests showed that well recorded events which occur within the geometery of the SOSN network can be located to a precision of 1 to 2 kilometers.

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