Abstract
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.
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