QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

Earthquake near Harrah, OK

No earthquake was likely felt in Harrah in the 24 hours to 2:15 pm CST (20:15 UTC). The last one was M 3.4, 81 km (50 mi) W, at 5:53 am CST on 7 November 2026, estimated intensity II (weak) in town; 23 felt reports to USGS. Every earthquake near Harrah

This page: a magnitude 2.5 earthquake was recorded 4 km (3 mi) east of Harrah, OK, at 10:49 pm CST on 6 February 2016 (04:49 UTC), 6.5 km deep.

USGS: 4 km E of Harrah, Oklahoma

36 km (23 mi) E of Oklahoma City, OK · 24 km (15 mi) E of Midwest City, OK

10:49 pm CST, Feb 6, 2016 · · 6.5 km deep · released about 170 lb of TNT

Every earthquake near Harrah Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Oklahoma County 28 kmLincoln County 32 kmPottawatomie County 34 kmCleveland County 37 kmLogan County 56 kmSeminole County 59 kmMcClain County 61 kmPayne County 67 kmOkfuskee County 71 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
10:49 pm CST on 6 February 2016 ()
Where
4 km (3 mi) east of Harrah, OK · earthquakes near Harrah
Oklahoma today
every earthquake in Oklahoma in the last 24 hours
Magnitude
M 2.5 (ml)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
Oklahoma County, 28 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3859 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 46 km (29 mi) from the epicentre. In Harrah, 4 km away, the estimate is intensity III (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Choctaw 14 km, intensity III · Luther 21 km, intensity II · Shawnee 25 km, intensity II · Midwest City 26 km, intensity II · Chandler 32 km, intensity II · Oklahoma City 36 km, intensity II · Moore 38 km, intensity II · Edmond 38 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.2 on 2016-01-01 — about 350 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.7 8 km NW of Prague, Oklahoma · 32 km E of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 35.4879, -97.1145. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Oklahoma County, OK 28 km (17 mi) WNW earthquakes near Oklahoma County
Lincoln County, OK 32 km (20 mi) NE earthquakes near Lincoln County
Pottawatomie County, OK 34 km (21 mi) SSE earthquakes near Pottawatomie County
Cleveland County, OK 37 km (23 mi) SSW earthquakes near Cleveland County
Logan County, OK 56 km (35 mi) NNW earthquakes near Logan County
Seminole County, OK 59 km (37 mi) SE earthquakes near Seminole County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

55 earthquakes have been recorded within 50 km since this one.

  1. 2.6 6 km W of Arcadia, Oklahoma
  2. 2.0 6 km W of Arcadia, Oklahoma
  3. 2.4 2 km NNE of Meridian, Oklahoma
  4. 3.0 3 km NE of Meridian, Oklahoma
  5. 2.6 3 km NE of Meridian, Oklahoma
  6. 3.4 5 km SW of Fallis, Oklahoma
  7. 3.0 6 km W of Arcadia, Oklahoma
  8. 2.6 8 km ESE of Guthrie, Oklahoma
  9. 2.6 5 km NNE of Dale, Oklahoma
  10. 3.3 6 km ENE of Edmond, Oklahoma
  11. 2.6 4 km WSW of Luther, Oklahoma
  12. 2.6 6 km NW of Meridian, Oklahoma
  13. 3.6 6 km NW of Meridian, Oklahoma
  14. 2.4 12 km SE of Cedar Valley, Oklahoma
  15. 3.0 12 km SE of Cedar Valley, Oklahoma

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.