QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

Earthquake near Enid, OK

No earthquake was likely felt in Enid in the 24 hours to 3:41 pm CST (21:41 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 2.6 earthquake was recorded 32 km (20 mi) west-southwest of Enid, OK, at 9:37 pm CDT on 11 August 2018 (02:37 UTC), 6.9 km deep. 2 people have reported feeling it to USGS.

USGS: 6 km NNW of Ames, Oklahoma

34 km (21 mi) WSW of Enid, OK · 112 km (70 mi) NW of Oklahoma City, OK

9:37 pm CDT, Aug 11, 2018 · · 6.9 km deep · released about 240 lb of TNT

Every earthquake near Enid Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Major County 29 kmGarfield County 40 kmKingfisher County 47 kmAlfalfa County 49 kmBlaine County 50 kmGrant County 67 kmWoods County 75 kmDewey County 80 kmLogan County 81 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
9:37 pm CDT on 11 August 2018 ()
Where
32 km (20 mi) west-southwest of Enid, OK · earthquakes near Enid
Oklahoma today
every earthquake in Oklahoma in the last 24 hours
Magnitude
M 2.6 (ml)
Depth
6.9 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Major County, 29 km W
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 51 km (32 mi) from the epicentre. In Enid, 32 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: Okeene 22 km, intensity III · Fairview 23 km, intensity II · Helena 28 km, intensity II · Enid 32 km, intensity II · Hennessey 36 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 5.1 on 2016-02-13 — about 5,600 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 36.2990, -98.2206. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Major County, OK 29 km (18 mi) W earthquakes near Major County
Garfield County, OK 40 km (25 mi) ENE earthquakes near Garfield County
Kingfisher County, OK 47 km (29 mi) SSE earthquakes near Kingfisher County
Alfalfa County, OK 49 km (30 mi) N earthquakes near Alfalfa County
Blaine County, OK 50 km (31 mi) SSW earthquakes near Blaine County
Grant County, OK 67 km (41 mi) NE earthquakes near Grant County

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

Aftershocks so far

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

  1. 2.3 9 km ENE of Carmen, Oklahoma
  2. 2.5 1 km N of Goltry, Oklahoma
  3. 2.3 9 km ESE of Bison, Oklahoma
  4. 2.5 5 km NNE of Okeene, Oklahoma
  5. 2.3 8 km SW of Goltry, Oklahoma
  6. 2.3 5 km N of Ames, Oklahoma
  7. 2.0 2 km NW of Jet, Oklahoma
  8. 3.3 4 km ESE of Meno, Oklahoma
  9. 2.3 8 km SW of Goltry, Oklahoma
  10. 1.9 3 km SE of Ringwood, Oklahoma
  11. 3.0 4 km ESE of Meno, Oklahoma
  12. 2.0 8 km NNW of Meno, Oklahoma
  13. 2.3 2 km ESE of Hennessey, Oklahoma
  14. 2.6 2 km SE of Hennessey, OK
  15. 2.2 6 km ESE of Cleo Springs, 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.