Can Oklahoma Earthquakes Damage Your Foundation?
Short answer: Rarely, in most cases. The U.S. Geological Survey says damage does not usually occur until an earthquake reaches somewhere above magnitude 4 or 5.[35] Most Oklahoma quakes are smaller. Oklahoma's magnitude 3+ quake count peaked at 903 in 2015[36] and fell to 29 by 2021.[37] For most OKC homes, clay soil is the bigger risk.
If you felt a quake and then spotted a new crack, it's natural to connect the two. Sometimes they are linked. More often, the crack was already forming, and the quake just made you look.
What the Numbers Say
- Before 2009, Oklahoma averaged about 2 magnitude 3+ earthquakes a year, according to the Oklahoma Geological Survey.[36]
- In 2015, the count peaked at 903.[36]
- By 2021, it had dropped to 29 a year, after state regulators and industry cut wastewater injection.[37]
When Quakes Have Caused Damage
Larger Oklahoma quakes have caused real damage. The 2016 magnitude 5.8 Pawnee earthquake was the largest recorded in the state.[38] The USGS names it and the 2016 magnitude 5.0 Cushing earthquake as larger events that caused damage. It also says most central U.S. quakes are in the magnitude 3 to 4 range: felt by many people, but small enough to rarely cause damage.[39]
What's More Likely to Blame
In the Oklahoma City area, soil moisture is the usual suspect. Clay soil swells when wet and shrinks when dry, which moves foundations up and down.[29] Central Oklahoma was rated "severely dry" for the 12 months through September 2026.[40] Drought cracks and quake cracks can look alike, so the pattern matters more than the timing.
What to Check After a Quake
- Walk the outside. Look for new stair-step cracks in brick and a chimney pulling away.
- Check doors and windows. Note any that suddenly stick or won't latch.
- Photograph cracks with a coin or ruler for scale, and write down the date.
- Watch for change. Cracks that grow over the next few weeks point to movement worth a pro's look.
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Frequently Asked Questions
Can a small earthquake crack my foundation?
It's unlikely. The USGS says damage does not usually occur until a quake reaches somewhere above magnitude 4 or 5, though distance, soil and how a home is built all matter.[35]
Are Oklahoma earthquakes still common?
Far less than before. Oklahoma had 903 magnitude 3+ quakes in 2015[36] and 29 in 2021.[37]
What was the biggest earthquake in Oklahoma?
The magnitude 5.8 Pawnee earthquake on September 3, 2016.[38] The USGS lists it among the larger Oklahoma quakes that caused damage.[39]
My cracks showed up after a quake. Was it the quake?
Maybe, but clay soil movement is the more common cause around Oklahoma City. A pro can look at the crack pattern and tell you what's likely going on.
Does homeowners insurance cover earthquake damage?
Standard policies usually exclude earthquakes. Check your policy, or see our Oklahoma homeowners insurance guide.
How does your free quote service work?
OKC Foundation Repair Experts is a free quote and referral service. We are not a contractor. You fill out the short form, and a local foundation repair company that serves your area contacts you. The request is free, and you never have to hire anyone.
Last updated 2026-10-29.
Sources
Figures are third-party published estimates, not quotes. Retrieved 2026-10-29.
- Oklahoma State University Extension – Moving to the Country? (NREM-965), Foundation Problems
- U.S. Geological Survey – At what magnitude does damage begin to occur in an earthquake?
- Oklahoma Geological Survey – Walter et al., "The Oklahoma Geological Survey Statewide Seismic Network," Seismological Research Letters (2020)
- Geological Society of America – "Oklahoma's coordinated response to more than a decade of elevated seismicity" (2023)
- Yeck et al., "Oklahoma experiences largest earthquake during ongoing regional wastewater injection hazard mitigation efforts," Geophysical Research Letters (2017)
- U.S. Geological Survey – Induced Earthquakes Overview
- Oklahoma Water Resources Board – Oklahoma Water Resources Bulletin, October 15, 2026