QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

6 km WSW of Chester, Oklahoma

· 7.2 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dewey County 23 kmWoodward County 38 kmMajor County 42 kmBlaine County 60 kmCuster County 60 kmWoods County 61 kmEllis County 69 kmAlfalfa County 84 kmRoger Mills County 87 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
Magnitude
M 2.1 (ml)
Depth
7.2 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Dewey County, 23 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3011 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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.

Where

Epicentre 36.1861, -98.9782. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dewey County, OK 23 km (15 mi) N of here earthquakes near Dewey County
Woodward County, OK 38 km (23 mi) SE of here earthquakes near Woodward County
Major County, OK 42 km (26 mi) WSW of here earthquakes near Major County
Blaine County, OK 60 km (37 mi) NW of here earthquakes near Blaine County
Custer County, OK 60 km (37 mi) N of here earthquakes near Custer County
Woods County, OK 61 km (38 mi) S of here earthquakes near Woods 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. 3.3 1 km WNW of Chester, Oklahoma
  2. 3.0 0 km WNW of Chester, Oklahoma
  3. 2.9 10 km WSW of Waynoka, Oklahoma
  4. 2.7 1 km WNW of Chester, Oklahoma
  5. 2.4 15 km SSE of Waynoka, Oklahoma
  6. 2.7 2 km S of Chester, Oklahoma
  7. 2.8 1 km S of Chester, Oklahoma
  8. 2.9 1 km SSW of Chester, Oklahoma
  9. 3.0 1 km S of Chester, Oklahoma
  10. 2.5 9 km SW of Waynoka, Oklahoma
  11. 2.7 17 km SE of Waynoka, Oklahoma
  12. 2.5 0 km NW of Chester, Oklahoma
  13. 2.4 17 km SE of Waynoka, Oklahoma
  14. 2.9 17 km SE of Waynoka, Oklahoma
  15. 2.6 17 km SE of Waynoka, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-02-13 — it released about 32,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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