How common are earthquakes in St. Louis, Missouri?

Here’s how often to expect it and how it happens.

St. Louis – How often do earthquakes occur in St. Louis? And how does that happen? Here is a look at the data.

Earthquakes are caused by movement along faults in the Earth’s crust and upper mantle. Seismic activity can be strong and sudden, or so weak that people don’t feel it.

Note: The video above is from 2021.

St. Louis is located in an area of ​​the country called the “Illinois Basin – Ozark Dome”. It is located north of the most active seismic zone of New Madrid.

The USGS tracks all faults on an updated map.

Illinois Basin – Ozark Dome includes parts of Missouri, Illinois, Indiana, Kentucky, and Arkansas.

The USGS says irregular but moderately frequent earthquakes can be expected in this area. Medium-damage earthquakes strike every 10-20 years, with small ones occurring once or twice a year.

The largest earthquake ever recorded in the area occurred in 1968. A 5.4-magnitude earthquake devastated southern Illinois. Geologists have evidence of larger prehistoric earthquakes in the area.

Earthquakes east of the Rocky Mountains

Earthquakes near St. Louis have different characteristics than earthquakes along the West Coast.

Earthquakes can be felt here for longer distances. Some earthquakes can be felt up to ten times greater. Earthquakes in the eastern United States can cause damage to locations farther from the epicenter.

Earthquakes are less frequent in the Midwest than along seismically active areas of California.

Faults such as the San Andreas fault system are a well-studied boundary, but little is known about a particular fault in the Illinois Basin—the Ozark Dome. These defects can be buried deeply. Defects in the area may be undetected yet.

Noise during earthquake

Shallow earthquakes in St. Louis can produce loud sounds that sound like gurgling or even explosions.

This noise is from high frequency vibrations. During deep earthquakes, these vibrations do not reach the ground.

RELATED: Magnitude 2.8 earthquake shakes St. Louis area, says USGS

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