In order to develop new data pertaining to the tectonic setting and potential geologic hazards in the Strait of Juan de Fuca and northern Puget Sound, a cooperative seismic reflection profile, gravity, and magnetic survey was conducted aboard the Canadian Survey Ship PARIZEAU in 1972. Results of approximately 2300 km of gravity and magnetic trackline data have been published by Snavely and others (1974), Tiffin and others (1974), and Macleod and others (1977). A map, based upon interpretation of about 700 km of seismic reflection profiles in the easternmost part of the strait, is nearing completion by H. C. Wagner and M. C. Wiley of the U.S. Geological Survey. The seismic reflection profiles in this area are being released at this time.
