Muriel L. Jacobson (compiler) 1983 The research results described in the following summaries were submitted by the investigators on October 20, 1983 and cover the 6-month period from April 1, 1983 through September 30, 1983. These reports include both work performed under contracts administered by the Geological Survey and work by members of the Geological Survey. The report summaries are grouped into the four major elements of the National Earthquake Hazards Reduction Program. application/pdf 10.3133/ofr83918 en U.S. Geological Survey Summaries of technical reports, volume XVII reports