B.G. Reagor S. T. Algermissen C. W. Stover 1979 <p>The earthquake data shown on this map and listed in table 1 are a list of earthquakes that were originally used in preparing the Seismic Risk Studies in the United States (Algermissen, 1969) which have been recompiled and updated through 1977. &nbsp;The data have been reexamined and intensities assigned where none had been assigned before, on the basis of available data. &nbsp;Other intensity values were updated from new and additional data sources that were not available at the time of original compilation. &nbsp;Some epicenters were relocated on the basis of new information. &nbsp;The data shown in table 1 are estimates of the most accurate epicenter, magnitude, and intensity of each earthquake, on the basis of historical and current information. &nbsp;Some of the aftershocks from large earthquakes are listed but are incomplete in many instances, especially for ones that occurred before seismic instruments were in universal usage.</p> application/pdf 10.3133/mf1142 en U.S. Geological Survey Seismicity map of the State of Ohio reports