Descr: A teleseismic study along the main N-S corridor of the Lithoprobe Western Superior Transect in Ontario, Canada. The objectives of this study are to determine the structure and physical properties of the subcrustal lithosphere in this region and to consider their implications concerning the accretionary model proposed for the western Superior Province. A total of 30 short-period 3 component and six broadband 3-component seismographs will be deployed for six months.