Geological-Seismological Evaluation of Earthquake Hazards at Prompton and Francis E. Walter Damsites, Pennsylvania.

A seismic zoning was developed for eastern Pennsylvania and adjacent states based on the geology and the historic seismicity. Floating earthquakes were assigned to those zones in the absence of identifiable active faults. At the Prompton and Francis E. Walter Damsites, motions were far field, Modified Mercalli VI, acceleration 0.12g, velocity 7 cm/sec, and 3 sec bracketed duration or = 0.05g. Accelerograms and response spectra appropriate to these parameters were selected.