Minor Quake Near Elgin Disrupts Months of Relative Seismic Quiet

Significance of the Event

On January 18, 2023, at 10:34 AM (CST), a minor earthquake with a magnitude of 3.1 occurred near Elgin, Oklahoma. This earthquake is notable as it broke a period of relative seismic quiet in the region. Prior to this event, the area had not experienced any earthquakes of magnitude 3.0 or greater since August 2022.

The epicenter of the earthquake was located approximately 7 miles northeast of Elgin, at a depth of 4.1 miles. According to the USGS, the earthquake was felt by residents in Elgin and the surrounding communities, but no damage or injuries were reported.

Geological Context

Elgin is situated within the Ouachita Mountains, a region that is known for its seismic activity. The Ouachita Mountains are formed by the collision of two tectonic plates, which has resulted in the formation of faults and fractures in the Earth's crust. These faults and fractures can serve as pathways for the release of seismic energy, leading to earthquakes.

The earthquake near Elgin occurred on a previously unidentified fault. However, the USGS has stated that the fault is likely part of a larger fault system that extends across the Ouachita Mountains. This fault system is known to be capable of producing earthquakes of up to magnitude 5.0 or greater.

Implications for Future Seismic Activity

The recent earthquake near Elgin serves as a reminder that the Ouachita Mountains are a seismically active region. While the earthquake was relatively minor, it highlights the potential for larger earthquakes to occur in the future. Residents of the region should be aware of the earthquake hazard and take steps to prepare for potential seismic events.

The USGS recommends that residents of the Ouachita Mountains take the following steps to prepare for earthquakes:

• Secure heavy objects to walls and ceilings.
• Store important documents and medications in a secure location.
• Practice earthquake drills.
• Be aware of the evacuation routes in your community.
• Have a plan for communicating with family and friends in the event of an earthquake.

By following these recommendations, residents of the Ouachita Mountains can help to reduce their risk of injury or damage in the event of an earthquake.