The Florida earthquake of October 27, 1973 had a macroseismic location at 28.1 °N,81.25 °W, about 30 kilometers south of Orlando. It occurred at 06:22 GMT and its magnitude (mb) was 4.0. The early morning occurrence prevented evaluation of the intensity I–II felt areas. However, it was felt with intensity III–V over 25,000 square kilometers of central and eastern Florida. A single possible aftershock which was recorded on a smoked-paper microearthquake recorder supports the macroseismic epicenter. A correlation of historic epicenters with Bouguer anomaly trends implies that earthquakes in Florida occur near the extensions of the edges of crustal blocks.

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