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Bulletin of the Seismological Society of America; February 1982; v. 72; no. 1; p. 221-236
© 1982 Seismological Society of America
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The Sharpsburg, Kentucky, earthquake 27 July 1980: Main shock parameters and isoseismal maps

FREDERICK J. MAUK, DOUG CHRISTENSEN and STEVE HENRY

TELEDYNE GEOTECH, 3401 SHILOH ROAD, GARLAND, TEXAS 75041
SEISMOLOGICAL OBSERVATORY DEPARTMENT OF GEOLOGICAL SCIENCES UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN 48109

Abstract

An earthquake having an average body-wave magnitude of 5.1 occurred on Sunday, 27 July 1980 near Sharpsburg, Kentucky. The earthquake was widely felt throughout the Eastern United States and had a maximum Modified Mercalli intensity of VII in the epicentral region. The total felt area was approximately 673,000 km2. The well-constrained focal mechanism based on 128 P-wave first motions combined with other geological and seismological evidence indicates a fault plane striking N42°E, dipping 50°E with a slip vector 184° of the strike. This is a right-lateral strike-slip event with a small component of thrust. Isoseismal data strongly suggest a northeast-directed rupture. The strike is parallel to the trend of the West Hickman Creek fault zone but 30 km to the east of any known faults.




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