2003 Alabama earthquake

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The epicenter of the 2003 Alabama earthquake. Source: United States Geological Survey
The epicenter of the 2003 Alabama earthquake. Source: United States Geological Survey

The 2003 Alabama earthquake took place on Tuesday, April 29, 2003 at 3:59 A.M. Eastern Standard Time eight miles ESE 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 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 over even larger areas. The earthquake was given a magnitude 4.6 on the Richter Scale by the USGS (other sources reported as high a magnitude as 4.9) and reports range the duration of the shaking from as 10 seconds to as long as 45 seconds. It is tied with a 1973 earthquake near Knoxville, Tennessee as the strongest eartquake ever to occur in the Eastern Tennessee Seismic Zone, which is 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 wide sinkhole northwest of Fort Payne. The quake also disrupted the local water supply. There were also 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 which had awakened them. There were several aftershocks, but all were of magnitude 2.0 or lower and so were not widely felt.[2]

29 foot sinkhole found in Ordovican dolomites northwest of Fort Payne, Alabama.
29 foot sinkhole found in Ordovican dolomites northwest of Fort Payne, Alabama.

[edit] References

  1. ^ [1] USGS; Earthquake Center; Earthquake Report; Magnitude 4.6 ALABAMA
  2. ^ a b [2] Geologic Survey of Alabama; Geologic Hazards Program; Earthquakes in Alabama; Fort Payne Earthquake April 29, 2003
  3. ^ [3] USGS; Earthquake Hazards Program; Community Interest Intensity Map; April 29, 2003 earthquake 8 miles ENE of Fort Payne, Alabama
  4. ^ [4] CNN; Small earthquake shakes the South; April 29, 2003
  5. ^ [5] USGS Poster; M4.6 Fort Payne, Alabama Earthquake of 29 April 2003

[edit] External links