Abstract

An analysis of collected data are presented for an mbLg 3.2 earthquake that occurred on August 8, 1993 approximately 15 km northeast of Aiken, South Carolina. A maximum intensity of IV (MM) was experienced near the small community of Couchton, South Carolina. Isoseismals seemed to mostly follow a northeast-southwest trend. One small aftershock occurred approximately six and one-half hours after the main event and was located coincident with it. A focal mechanism was derived using 18 impulsive P-wave first motions of local and regional stations indicating predominantly strike-slip motion on a southeast striking plane dipping 60° to the southwest. The event was not associated with established seismogenic zones of South Carolina but was characteristic of occasional strain release that occurs in broad regions of the South Carolina Piedmont. The event and its aftershock, while not particularly large or unusual for the South Carolina Central Piedmont and upper Coastal Plain, contribute background information and data for the historical record.

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