A small earthquake with a Richter magnitude of 2.5 (University of Michigan) or 3.0 (National Earthquake Information Center) shook residents of eastern Michigan, southern Ontario, and northwestern Ohio on the morning of August 20, 1980. The epicenter was in the Canadian waters of western Lake Erie at 41.9°N, 82.9°W, approximately on the axis of the Findlay arch. Origin time (UTC) was 09:34:53.4 (5:34 AM Eastern Daylight Time). No damages were reported.