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Overnight earthquake shakes East Tennessee
The epicenter of the all-night earthquake was the orange dot within the concentric colored circles. Photo: USGS
According to the USGS, a weak earthquake shook eastern Tennessee in Greenback Township, southwest of Knoxville last night. The relatively benign event of magnitude 2.0 occurred from a depth of 13.6 km at 9:55 p.m. No one used the USGS “Did you feel it?” A tool on their website for reporting vibration; Most earthquakes of less than magnitude 2.0 cannot be felt, and seismic events at 2 o’clock can only be felt occasionally by people.
While the earthquake was weak, it adds to the number of earthquakes that have hit Tennessee in recent weeks. There were 3 in the last 7 days and 12 in the last 30 days. In the last 365 days, 257 earthquakes hit and around Tennessee.
Most of the earthquakes that have occurred during the past seven days are in the western part of the state, where there has been significant seismic activity in recent weeks. Western Tennessee lies within the New Madrid Seismic Zone, an area notable for a catastrophic series of earthquakes in 1811-1812 that were centered near New Madrid County, Missouri. The New Madrid Seismic Zone is also known as the NMSZ for short.
While the west coast of the United States is notorious for earthquakes, there is a significant earthquake risk elsewhere in the country. Photo: USGS
According to the Missouri Department of Public Safety, the New Madrid seismic zone is active and averages about 200 measured events per year (magnitude 1.0 or greater). Tremors large enough to be felt (magnitude 2.5 – 3.0) occur annually. On average every 18 months, a rift releases a shock of magnitude 4.0 or greater, which can cause minor local damage. An amount of 5.0 or greater occurs about once every decade, can cause significant damage and can be felt in many cases.
According to the USGS, the magnitude of earthquakes in the NMSZ is about 300% more than normal this summer. While the magnitude was high, the intensity was low and the earthquake caused no damage or injuries.
Earthquakes like last night’s earthquakes in eastern Tennessee are unlikely to be associated with the New Madrid seismic zone. However, while the USGS says that western Tennessee has a higher frequency of devastating earthquakes, the risk is not low in eastern Tennessee. In the area of this latest earthquake, the US Geological Survey says this area will likely experience 50-100 devastating earthquakes over 10,000 years. While this number is low, it is much higher than elsewhere in the eastern half of the United States, where there were likely to be 10 or fewer earthquakes during the same period.
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