QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

Earthquake near Enid, OK

No earthquake was likely felt in Enid in the 24 hours to 10:10 am CST (16:10 UTC). The last one was M 3.4, 89 km (55 mi) S, at 5:53 am CST on 7 November 2026, estimated intensity II (weak) in town; 23 felt reports to USGS. Every earthquake near Enid

This page: a magnitude 2.5 earthquake was recorded 36 km (22 mi) southeast of Enid, OK, at 11:35 pm CDT on 5 August 2018 (04:35 UTC), 4.3 km deep.

USGS: 9 km NE of Marshall, Oklahoma

83 km (51 mi) N of Oklahoma City, OK · 36 km (22 mi) SE of Enid, OK

11:35 pm CDT, Aug 5, 2018 · · 4.3 km deep · released about 170 lb of TNT

Every earthquake near Enid Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Garfield County 28 kmLogan County 34 kmNoble County 34 kmKingfisher County 45 kmPayne County 54 kmGrant County 67 kmOklahoma County 74 kmKay County 76 kmPawnee County 78 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
11:35 pm CDT on 5 August 2018 ()
Where
36 km (22 mi) southeast of Enid, OK · earthquakes near Enid
Oklahoma today
every earthquake in Oklahoma in the last 24 hours
Magnitude
M 2.5 (ml)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Garfield County, 28 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2947 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 Enid, 36 km away, the estimate is intensity II (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: Perry 25 km, intensity II · Crescent 29 km, intensity II · Hennessey 33 km, intensity II · Enid 36 km, intensity II · Guthrie 39 km, intensity II · Langston 40 km, intensity II · Stillwater 46 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 4.6 on 2018-04-09 — about 1,400 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 36.2116, -97.5546. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Garfield County, OK 28 km (17 mi) NW earthquakes near Garfield County
Logan County, OK 34 km (21 mi) SSE earthquakes near Logan County
Noble County, OK 34 km (21 mi) NE earthquakes near Noble County
Kingfisher County, OK 45 km (28 mi) SW earthquakes near Kingfisher County
Payne County, OK 54 km (34 mi) ESE earthquakes near Payne County
Grant County, OK 67 km (42 mi) NNW earthquakes near Grant County

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

Aftershocks so far

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

  1. 1.9 2 km E of Hennessey, Oklahoma
  2. 2.6 5 km W of Lucien, Oklahoma
  3. 2.4 4 km W of Lucien, Oklahoma
  4. 2.5 5 km NNE of Cedar Valley, Oklahoma
  5. 2.7 0 km NNW of Coyle, Oklahoma
  6. 2.5 5 km E of Hennessey, Oklahoma
  7. 2.5 5 km W of Lucien, Oklahoma
  8. 3.0 5 km WNW of Lucien, Oklahoma
  9. 2.5 4 km W of Lucien, Oklahoma
  10. 2.4 3 km WSW of Lucien, Oklahoma
  11. 3.0 4 km E of Hennessey, Oklahoma
  12. 2.6 2 km ESE of Hennessey, Oklahoma
  13. 2.3 2 km ESE of Hennessey, Oklahoma
  14. 2.6 7 km S of Guthrie, Oklahoma
  15. 2.8 1 km E of Fairmont, 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.