R. Street, A. Zekulin, M. Allsop, D. Couch; The Spatial Correlation Between a Lateral Seismic Velocity Discontinuity in the Precambrian Basement Rock and the Sharpsburg, Kentucky Earthquake of July 27, 1980. Seismological Research Letters ; 56 (2): 47–54. doi: https://doi.org/10.1785/gssrl.56.2.47
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Seismic refraction data from a series of profiles in northeastern Kentucky near the epicenter of the 1980 Sharpsburg earthquake, show that the earthquake occurred within the immediate vicinity of a seismic velocity discontinuity in the Precambrian basement rock. The P-wave velocity of the basement rock to the west of the discontinuity is 6.15 km/s, while the P-wave velocity of the basement rock to the east of the discontinuity is 6.9 km/s.
It is suggested that the geologic feature responsible for the localization of the Sharpsburg, Kentucky earthquake is the seismic velocity discontinuity in the basement.