Earthquake swarm near New Madrid, Missouri
A series of earthquakes struck near the New Madrid Fault Line in southeastern Missouri on December 9, 2024, with the strongest registering M3.0 at 06:27 UTC (12:27 local time), according to the U.S. Geological Survey (USGS). This region, known as the New Madrid Seismic Zone, is the most seismically active area in the United States east of the Rocky Mountains.
Earthquake swarm near New Madrid Fault line, Missouri on December 9, 2024. Image credit: TW/SAM, Google
The sequence started at 06:00 UTC (00:00 LT) on December 9 with an M2.0 quake at a depth of 12.2 km (7.6 miles), located 6 km (3.7 miles) ESE of Hayward (population 131).
M2.2 was registered just 8 minutes later about 8 km (5 miles) ESE of Matthews (population 628), at a depth of 19.2 km (12 miles).
The strongest of the sequence, an M3.0 earthquake, struck near Howardville (population 367) at 06:27 UTC (00:27 LT) at a depth of 7.8 km (4.8 miles).
M2.1, M1.8, and M1.9 were registered by 12:25 UTC, followed by the final earthquake at 13:30 UTC (07:30 LT) — an M2.2 near Marston (population 477), Missouri at a depth of 8.4 km (5.2 miles).
The New Madrid Seismic Zone is one of the most seismically active regions in North America east of the Rocky Mountains. However, such swarms are not uncommon in this area and do not necessarily indicate an impending larger earthquake.
They are typically characterized by clusters of small to moderate earthquakes occurring over a short period. They often result from the gradual release of tectonic stress along fault lines or changes in subsurface conditions, such as fluid movement within the Earth’s crust.
While the New Madrid Seismic Zone has historically produced some of the most powerful earthquakes in the United States, modern monitoring has shown that smaller swarms are relatively frequent.
The zone produced 3 massive earthquakes, estimated to have been between M7.0 and M8.0, from 1811 to 1812. The events caused widespread destruction and were felt as far as Cincinnati, Ohio; Charleston, South Carolina; and New Orleans, Louisiana.
Earthquakes here occur on a complex network of faults within the Reelfoot Rift, an ancient geological feature that formed approximately 500 million years ago. The faults are buried beneath layers of sediment, making seismic activity difficult to predict.
References:
1 New Madrid Fault line, Missouri earthquakes – USGS – Accessed December 10, 2024
2 Science of the New Madrid Seismic Zone – USGS – Accessed December 10, 2024
Rishika holds a Master’s in International Studies from Stella Maris College, Chennai, India, where she earned a gold medal, and an MCA from the University of Mysore, Karnataka, India. Previously, she served as a Research Assistant at the National Institute of Advanced Studies, Indian Institute of Science, Bengaluru, India. During her tenure, she contributed as a Junior Writer for Europe Monitor on the Global Politics website and as an Assistant Editor for The World This Week. Her work has also been published in The Hindu newspaper, showing her expertise in global affairs. Rishika is also a recipient of the Women Empowerment Award at the district level in Haryana, India, in 2022.
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