Principal Facts of Gravity data in the Northern Willamette Valley and Vicinity, Northwestern Oregon and Southwestern Washington

Prior to this effort to improve the gravity data coverage in the study area, very little regional data were available. This report gives the principle facts for 2710 new gravity stations and 1446 preexisting gravity stations.

Much of the study area is now covered with data of sufficient density to define basin boundaries and correlate with many of the larger fault systems. The study area lies between 44° 52.5' and 46° N latitude and between 122° 15' and 123° 37.5' W longitude. Although this is a continuing project and more gravity data is expected to be collected, this report is being published to show the progress of the data collection.