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Thanksgiving Day Earthquakes Rattle Virginia, Mississippi, Tennessee, and Arkansas

by Weatherboy Team Meteorologist - November 28, 2024

The epicenter of each earthquake is at the orange dot inside each set of colored, concentric circles. Image: USGS
The epicenter of each earthquake is at the orange dot inside each set of colored, concentric circles. Image: USGS

Thanksgiving Day is rattled in the eastern United States with USGS reporting earthquakes striking Virginia, Mississippi, Tennessee, and Arkansas. The strongest of the bunch hit Mississippi, which was a magnitude 2.5 seismic event. The others ranged from a magnitude 1.8 event and up; while some felt shaking or heard a boom, none were strong enough to create any damage or injuries.

The first struck just before midnight last night in central Virginia. The magnitude 1.8 earthquake struck near Louisa Virginia north and west of Richmond at 11:39 pm from a depth of 0.3 km.

The second struck in Mississippi at 1:48 am from a depth of 5 km, striking near Canton  which is north and east of Jackson.

The next three earthquakes struck near each other in western Tennessee, starting at 4:23 am, with another at 4:39 am, and 4:59 am. A fourth earthquake struck later in the morning in the same general area at 5:08 am. These earthquakes ranged from 5.9 km to 6.1 km deep, striking near Ridgely which is in the New Madrid Seismic Zone.

The other earthquake struck in Strawberry, Arkansas at 4:24 am. That magnitude 2.1 event struck from a depth of 8 km and is also considered to be within the New Madrid Seismic Zone.

While  last night’s earthquakes were relatively inconsequential with no  damage reports, authorities are concerned that people aren’t properly prepared for when a big earthquake will strike this region.  The matter of a larger destructive earthquake in this area is more of a matter  of “when” rather than “if.”  These earthquake in Tennessee in particular was within the New Madrid Seismic Zone, or NMSZ for short; while it and the other two quakes were far from significant, they struck in an area where a significant earthquake will happen again at some point in the future.

The New Madrid Seismic zone remains active and another large earthquake strong enough to shake the entire eastern United States continues to loom. Image: USGS
The New Madrid Seismic zone remains active and another large earthquake strong enough to shake the entire eastern United States continues to loom. Image: USGS

The NMSZ has a violent history that experts say will repeat itself, although no one is sure when it’ll happen.

December 16 marks the anniversary of the first of three major quakes to strike the United States during the winter of 1811-1812, a violent time in seismological history of the region that scientists say will be repeated again.

While the US West Coast is well known for its seismic faults and potent quakes, many aren’t aware that one of the largest quakes to strike the country actually occurred near the Mississippi River. On December 16, 1811, at roughly 2:15am, a powerful 8.1 quake rocked northeast Arkansas in what is now known as the New Madrid Seismic Zone.  The earthquake was felt over much of the eastern United States, shaking people out of bed in places like New York City, Washington, DC, and Charleston, SC. The ground shook for an unbelievably long 1-3 minutes in areas hit hard by the quake, such as Nashville, TN and Louisville, KY. Ground movements were so violent near the epicenter that liquefaction of the ground was observed, with dirt and water thrown into the air by tens of feet.  President James Madison and his wife Dolly felt the quake in the White House while church bells rang in Boston due to the shaking there.

But the quakes didn’t end there. From December 16, 1811 through to March of 1812, there were over 2,000 earthquakes reported in the central Midwest with 6,000-10,000 earthquakes located in the “Bootheel” of Missouri where the New Madid Seismic Zone is centered.

Damage-range comparison between a moderate New Madrid zone earthquake (1895, magnitude 6.8), and a similar Los Angeles event (1994, magnitude 6.7). Yellow indicates where shaking was felt; red indicates at least minor damage to buildings and their contents. Image: USGS
Damage-range comparison between a moderate New Madrid zone earthquake (1895, magnitude 6.8), and a similar Los Angeles event (1994, magnitude 6.7). Yellow indicates where shaking was felt; red indicates at least minor damage to buildings and their contents. Image: USGS

The second principal shock,  a magnitude 7.8, occurred in Missouri weeks later on January 23, 1812, and the third, a 8.8, struck on February 7, 1812, along the  Reelfoot fault in Missouri and Tennessee.

The main earthquakes and the intense aftershocks created significant damage and some loss of life, although lack of scientific tools and news gathering of that era weren’t able to capture the full magnitude of what had actually happened. Beyond shaking, the quakes also were responsible for triggering unusual natural phenomena in the area: earthquake lights, seismically heated water, and earthquake smog.

Since 1974, there have been more than 4,000 earthquakes near the New Madrid Seismic Zone. Scientists believe a large earthquake here in the future isn't a matter of if but when. Image: USGS
Since 1974, there have been more than 4,000 earthquakes near the New Madrid Seismic Zone. Scientists believe a large earthquake here in the future isn’t a matter of if but when. Image: USGS

Residents in the Mississippi Valley reported they saw lights flashing from the ground. Scientists believe this phenomena was “seismoluminescence”; this light is generated when quartz crystals in the ground are squeezed.  The “earthquake lights” were triggered during the primary quakes and strong aftershocks.

Water thrown up into the air from the ground, or the nearby Mississippi River, was also unusually warm. Scientists speculate that intense shaking and the resulting friction led to the water to heat, similar to the way a microwave oven stimulates molecules to shake and generate heat. Other scientists believe as the quartz crystals were squeezed, the light they emit also helped warm the water.

During the strong quakes, the skies turned so dark that residents claimed lit lamps didn’t help illuminate the area; they also said the air smelled bad and was hard to breathe. Scientists speculate this “earthquake smog” was caused by dust particles rising up from the surface, combining with the eruption of warm water molecules into the cold winter air. The result was a steamy, dusty cloud that cloaked the areas dealing with the quake.

The February earthquake was so intense that boaters on the Mississippi River reported that the flow of the water there reversed for several hours.

The area remains seismically active and scientists believe another strong quake will impact the region again at some point in the future. Unfortunately, the science isn’t mature enough to tell whether that threat will arrive next week or in 50 years. Either way, with the population of New Madrid Seismic Zone huge compared to the sparsely populated area of the early 1800s, and tens of millions more living in an area that would experience significant ground shaking, there could be a very significant loss of life and property when another major quake strikes here again in the future.

 

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