The epicenter of the 2003 Alabama earthquake. Source: United States Geological Survey
The 2003 Alabama earthquake took place on April 29 at 3:59 A.M. Central Daylight Time (local time when the event occurred) eight miles (13 km) east-northeast of Fort Payne, Alabama.[1][2] The number of people who felt this quake was exceptionally high as the earthquake could be felt in 11 states across the East Coast and as far north as southern Indiana.[3] The earthquake was strongly felt throughout metropolitan Atlanta.[4] The Georgia Building Authority was called out to inspect the historic Georgia State Capitol in downtown Atlanta and other state-owned buildings but found no problems. However, this is not out of the ordinary as earthquakes east of the Rocky Mountains can be felt several times the area felt on West Coast earthquakes. The earthquake was given a magnitude 4.6 on the moment magnitude scale by the USGS (other sources reported as high a magnitude as 4.9) and reports of the duration of the shaking range from 10 seconds to as long as 45 seconds. It is tied with a 1973 earthquake near Knoxville, Tennessee as the strongest earthquake ever to occur in the Eastern Tennessee Seismic Zone, which is the second most active seismic zone east of the Rocky Mountains, with the New Madrid Seismic Zone the most active.[5]
The April 29 earthquake caused moderate damage in northern Alabama including a 29-foot (8.8 m) wide sinkhole northwest of Fort Payne. The quake disrupted the local water supply. There were numerous reports of chimney damage, broken windows, and cracked walls, particularly around the area near Hammondville, Mentone and Valley Head, Alabama. Many 9-1-1 call centers were overloaded with worrisome and panicked residents, who thought it was a train derailment, a bomb, or some other type of explosion that had awakened them. There were several aftershocks, all of magnitude 2.0 or lower, and were not widely felt.[2]
^[1] Archived 2010-03-06 at the Wayback Machine USGS; Earthquake Center; Earthquake Report; Magnitude 4.6 ALABAMA
^ ab[2] Geologic Survey of Alabama; Geologic Hazards Program; Earthquakes in Alabama; Fort Payne Earthquake April 29, 2003
^[3] USGS; Earthquake Hazards Program; Community Internet Intensity Map; April 29, 2003 earthquake 8 miles (13 km) ENE of Fort Payne, Alabama
^[4] CNN; Small earthquake shakes the South; April 29, 2003
^[5] USGS Poster; M4.6 Fort Payne, Alabama Earthquake of 29 April 2003
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