ST. LOUIS — A magnitude 4.0 earthquake happened just before 9 p.m. Wednesday night northwest of Poplar Bluff near Williamsville, Missouri. Some felt a little shaking as far north as Kirkwood and St. Charles County with more numerous reports farther south.
This quake isn't strong enough to cause damage and is in the area of the New Madrid Seismic Zone.
The St. Louis area is close to both the New Madrid Seismic Zone and the Wabash Valley Seismic Zone. It is not unusual for small earthquakes to occur in these areas several times a year.
There are many faults in this region and the quake was deep underground over 9.5 miles below the surface.
Most of the earthquakes are so small, few people even notice. Occasionally, a slightly stronger quake will occur and can be felt for longer distances due to the quakes being so deep underground and the bedrock that lies under the middle part of the country.
Earthquake safety tips:
What do you do if you feel the ground begin to move below your feet? DROP, COVER, HOLD
- DROP to your hands and knees and get under a table or desk if possible.
- COVER your head & neck with your hands & arms.
- HOLD on until the shaking stops.