QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

1 km S of Chester, Oklahoma

· 6.5 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dewey County 26 kmMajor County 36 kmWoodward County 40 kmBlaine County 57 kmWoods County 58 kmCuster County 62 kmEllis County 74 kmAlfalfa County 79 kmRoger Mills County 92 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 2.8 (ml)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
Dewey County, 26 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3550 days ago

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

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 36.2034, -98.9221. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dewey County, OK 26 km (16 mi) NNE of here earthquakes near Dewey County
Major County, OK 36 km (22 mi) WSW of here earthquakes near Major County
Woodward County, OK 40 km (25 mi) SE of here earthquakes near Woodward County
Blaine County, OK 57 km (36 mi) NW of here earthquakes near Blaine County
Woods County, OK 58 km (36 mi) S of here earthquakes near Woods County
Custer County, OK 62 km (39 mi) N of here earthquakes near Custer County

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

Aftershocks so far

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

  1. 2.8 17 km SSE of Waynoka, Oklahoma
  2. 2.7 17 km SSE of Waynoka, Oklahoma
  3. 2.8 8 km WSW of Waynoka, Oklahoma
  4. 2.9 17 km SE of Waynoka, Oklahoma
  5. 2.6 9 km WSW of Waynoka, Oklahoma
  6. 2.5 12 km WSW of Cleo Springs, Oklahoma
  7. 2.7 16 km SE of Waynoka, Oklahoma
  8. 2.6 16 km SSE of Waynoka, Oklahoma
  9. 3.0 17 km SSE of Waynoka, Oklahoma
  10. 2.6 17 km SSE of Waynoka, Oklahoma
  11. 3.0 17 km SSE of Waynoka, Oklahoma
  12. 2.8 2 km WNW of Chester, Oklahoma
  13. 2.9 17 km SSE of Waynoka, Oklahoma
  14. 2.9 17 km SSE of Waynoka, Oklahoma
  15. 2.5 2 km WNW of Chester, 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 2,800 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.