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Over the past seven days, 8 earthquakes have struck the eastern United States

Over the past seven days, 8 earthquakes have struck the eastern United States
Over the past seven days, 8 earthquakes have struck the eastern United States

 



Each yellow dot represents the epicenter of an earthquake that occurred within the past seven days. Image: USGS

According to the USGS, over the past seven days, 8 earthquakes have struck parts of the eastern United States and Canada. The strongest of the weak quakes was the 2.1 magnitude event that occurred Thursday night in Kentucky. Due to the intensity of these earthquakes, or their absence, there were no reports of damage or injuries.

The first strike of the seven-day period was east and northeast of Brevard, North Carolina. The 1.8 magnitude earthquake was superficial and occurred at a depth of only 0.4 km.

Seven hours after the first earthquake, another weak earthquake with a magnitude of 1.8 struck the small town of Swanville, Maine. This earthquake struck from a depth of 7.4 km, not far from Bar Harbor.

The third earthquake struck east of Niota, Tennessee. It struck from a depth of 10 km.

The fourth earthquake occurred near Madison, Ohio, where there has been continued earthquake activity in recent weeks. The 1.7-magnitude quake struck at a depth of 5 kilometers, not far from where other epicenters of recent quakes struck.

The fifth earthquake struck the Canadian province of Quebec, near the town of Labifany, north of Montreal. The 1.8 magnitude event was at a depth of 8.4 km.

The sixth quake occurred near where the third quake occurred, near Niota and Madisonville. This 1.5 magnitude event had a depth of 13.9 km.

The seventh earthquake struck northeastern Maine, in Miramichi, Canada. This magnitude 2.0 event occurred at a depth of 5 kilometers.

The eighth earthquake, the strongest among earthquakes, struck southwest of Stearns, Kentucky. The earthquake, which had a magnitude of 2.1, was at a depth of 25.4 km.

In addition to these 8 earthquakes, there have also been 4 earthquakes over the past 7 days in the highly active New Madrid Seismic Zone (NMSZ) near the Mississippi River. All four of these earthquakes occurred in Missouri. The first, with a magnitude of 1.9, occurred on the night of February 18 near Weingarten from a depth of 5.1 km. The next two incidents occurred at the same place in Marston, three hours apart on the afternoon of the 19th; The first is a magnitude of 1.5 from a depth of 7.4 km, and the second is a magnitude of 1.6 from a depth of 7.9 km. The last and most powerful Grandine struck from a depth of 15.2 km. It was a magnitude 2.7 event.

The New Madrid seismic zone remains active, and another large earthquake strong enough to shake the entire eastern United States still looms on the horizon. Image: USGS

While the West Coast of the United States is known for its seismic faults and powerful earthquakes, many do not realize that one of the largest earthquakes to hit the country actually occurred near the Mississippi River. On December 16, 1811, at approximately 2:15 a.m., a powerful 8.1 magnitude earthquake struck northeastern Arkansas in what is now known as the New Madrid Seismic Zone. The quake was felt across much of the eastern United States, shaking people out of bed in places like New York City, Washington, D.C., and Charleston, South Carolina. The ground shook for an incredible 1-3 minutes in areas hit hard by the quake, such as Nashville, Tennessee, and Louisville, Kentucky. Ground movements were so violent near the epicenter that the ground was observed to liquefy, with dirt and water spraying dozens of feet into the air. President James Madison and his wife, Dolly, felt the earthquake in the White House, while church bells rang in Boston due to the shaking there.

But the earthquakes did not end there. From December 16, 1811 through March 1812, more than 2,000 earthquakes were reported in the central Midwest, with 6,000 to 10,000 earthquakes occurring in Bothell, Missouri, where the New Madeleine Seismic Zone is centered.

The second major shock, with a magnitude of 7.8, struck in Missouri weeks later on January 23, 1812, and the third, with a magnitude of 8.8, struck on February 7, 1812, along the Reelfoot Fault in Missouri and Tennessee.

Major earthquakes and severe aftershocks caused significant damage and some loss of life, although the lack of scientific instruments and news gathering of the era was unable to capture the full extent of what actually happened. In addition to tremors, earthquakes have also been responsible for triggering unusual natural phenomena in the region: earthquake lights, seismically hot water, and earthquake smog.

Residents in the Mississippi Valley reported seeing lights flashing from the ground. Scientists believe that this phenomenon was “seismic scintillation”; This light is generated when quartz crystals in the ground are compressed. “Earthquake lights” were turned on during initial earthquakes and strong aftershocks.

The updated model shows areas in red that have the greatest chances of seeing a devastating earthquake over the next 100 years. Image: USGS

Water flowing into the air from the ground, or from the nearby Mississippi River, was also unusually warm. Scientists speculate that the intense vibration and resulting friction heated the water, similar to the way a microwave oven stimulates molecules to vibrate and generate heat. Other scientists believe that when the quartz crystals were compressed, the light they emitted also helped heat the water.

During strong earthquakes, the sky turned so dark that residents claimed that lit lamps did not help illuminate the area; They also said the air smelled bad and it was difficult to breathe. Scientists speculate that this “seismic smog” is caused by dust particles rising from the surface, combining with the explosion of warm water molecules in the cold winter air. The result was a dusty, steamy cloud that covered the areas hit by the quake.

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

The area is still seismically active and scientists believe that another strong earthquake will affect the area again at some point in the future. Unfortunately, the science is not mature enough to know whether this threat will arrive next week or in 50 years. In either case, because the population of the New Madrid Seismic Zone is huge compared to the sparsely populated area of ​​the early 19th century, and tens of millions live in an area that may experience major earthquakes, there could be very large losses of life and property. When another big earthquake strikes here again in the future.

Sources

1/ https://Google.com/

2/ https://weatherboy.com/over-last-7-days-8-earthquakes-rattle-eastern-united-states/

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