M1.8 earthquake 8 km N of Knowles, Oklahoma
A magnitude 1.8 earthquake struck 8 km N of Knowles, Oklahoma on Fri, Jul 16, 2021, 4:09 AM CDT (09:09 UTC), 18 km (11 mi) below the surface.
A larger quake followed: M1.9 20 km NNE of Woodward, Oklahoma. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (ml), micro
- Local time
- UTC
- 2021-07-16 09:09:04 UTC
- Depth
- 17.5 km (10.9 mi), shallow
- Epicenter
- 36.952° N, 100.177° W
- Region
- Oklahoma
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.19
- Station coverage gap
- 260°, poorly surrounded by stations
- Stations used
- 23
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayOklahoma earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event ok2021nuus. Read Wed, Sep 23, 2026, 12:54 AM UTC.