20 years ago – the most powerful earthquake rocked northern Alabama

Here in the Tennessee Valley, earthquakes don’t happen every day but they certainly aren’t uncommon. Most of the time, when an earthquake occurs here, it is of such a low magnitude that it cannot be felt. On April 29, 2003, North Alabama experienced the most powerful earthquake in history.

This strong earthquake had a magnitude of 4.6 and was detected 5 miles south of Valley Head. While the epicenter was located near DeSoto State Park, it was felt across much of the southeastern United States. According to the United States Geological Survey (USGS), approximately 17,000 individuals reported feeling the quake.

Minor damage was reported near the communities of Fort Payne and Valley Head. This limited damage included a gutter hole in a home’s yard and cracked windows on some homes in DeKalb County.

North Alabama Past Earthquakes:

In northern Alabama, the earthquakes are associated with the Southern Appalachian Seismic Zone while southern Alabama is affected by the Bahamas Rocks Seismic Zone. Just to the northwest is the New Madrid Rift, which affects parts of Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri, and Tennessee.

The strength of an earthquake is measured on the Richter scale, which was developed in 1935. The magnitude of an earthquake is determined by the amplitude of the waves recorded on a seismograph. Volume ranges on a scale from 0 to 10, with 10 being the highest. Alabama earthquakes range from 2.5 to 5.4, which puts it in the category of small earthquakes. In this category, the damage reported is generally minimal and can be felt.

When looking at the stats for northern Alabama, the region has had 37 earthquakes; This is based on earthquakes of magnitude 2.5 or higher. This range was chosen because anything below 2.5, while detectable, is hard to feel. Data from 1950 to the present day was examined, using information from the USGS. Here in northern Alabama, the earthquake has an average magnitude of 3.0.

Alabama earthquakes:

Looking at the entire state of Alabama, there have been a great deal of earthquakes from 1950 to the present. There were a total of 163 earthquakes measuring 2.5 or larger on the Richter scale. Some of these earthquakes have been associated with mine explosions, mine collapses, or other types of explosions.

The strongest earthquake was measured at magnitude 4.8, and this happened twice. The first earthquake with a magnitude of 4.8 was in 1997, nine miles northwest of Flumaton in the southern parts of the state. The second was to the west of Birmingham near the community of North Jones in 1999.

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