3.1 Earthquake today near Lancaster, Ky

We also have the Kentucky River Fault Zone. The New Madrid Fault Zone is more dangerous than the San Andreas Fault. 

New Madrid fault Seismic zone
The New Madrid Seismic Zone (NMSZ) is one of the most significant earthquake-prone regions in the central United States.
Overview
The NMSZ is a network of faults located beneath the Mississippi River Valley, primarily affecting southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky, and southern Illinois.
It is an intraplate fault system, meaning it lies within the interior of the North American tectonic plate rather than along a plate boundary (unlike California’s San Andreas Fault).

Historical Earthquakes
The zone is best known for the 1811–1812 New Madrid earthquake sequence, which included at least three major earthquakes estimated at magnitude 7.0–7.7.
These quakes were felt across much of the eastern U.S., caused ground liquefaction, altered the course of the Mississippi River in places, and created features like Reelfoot Lake in Tennessee.

Current Seismic Activity
The NMSZ remains seismically active, producing hundreds of small earthquakes each year, most too weak to be felt.
Larger damaging earthquakes are infrequent, but the risk is considered real due to the region’s geologic structure.

Why It’s Dangerous
Central U.S. Compared to similar-magnitude earthquakes in the western United States, earthquakes here can be felt over a much wider area due to the efficient transmission of seismic waves caused by the geology.
Much of the region has older buildings and infrastructure not designed for strong earthquakes, increasing potential damage.

Risk Outlook
USGS estimates suggest roughly a 7–10% chance of a magnitude 7 or greater earthquake in the next 50 years and a higher chance for a magnitude 6+ event.
States in and around the zone incorporate the NMSZ into building codes, emergency planning, and preparedness efforts.

The U.S. Geological Survey is conducting low-level flights across sections of Missouri, Arkansas and Tennessee this week looking for clues about the New Madrid earthquake fault zone.

The USGS begins conducting the flights Wednesday over a 1,400-square-mile area across southeastern Missouri, northeastern Arkansas and western Tennessee.

Crews will be measuring the magnetic field of the earth and underground rock formations to help locate concealed faults associated with the New Madrid seismic zone.

The USGS says the New Madrid area has been the most seismically active region in the United States east of the Rockies for decades.

The USGS says while there's no evidence of an imminent large earthquake, the agency has serious concerns about the potential repeat of a destructive earthquake like those that occurred in the 1800s.