QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

15 km SSW of Freedom, Oklahoma

· 3.4 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woodward County 25 kmWoods County 31 kmHarper County 46 kmComanche County 61 kmMajor County 68 kmEllis County 68 kmDewey County 75 kmAlfalfa County 78 kmBarber County 79 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 3.0 (ml)
Depth
3.4 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Woodward County, 25 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3141 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 36.6396, -99.1881. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woodward County, OK 25 km (16 mi) NNE of here earthquakes near Woodward County
Woods County, OK 31 km (19 mi) WSW of here earthquakes near Woods County
Harper County, OK 46 km (29 mi) ESE of here earthquakes near Harper County
Comanche County, KS 61 km (38 mi) S of here earthquakes near Comanche County
Major County, OK 68 km (42 mi) WNW of here earthquakes near Major County
Ellis County, OK 68 km (42 mi) NE of here earthquakes near Ellis County

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

Aftershocks so far

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

  1. 2.8 22 km NE of Fort Supply, Oklahoma
  2. 2.7 27 km SSE of Protection, Kansas
  3. 3.0 22 km NE of Fort Supply, Oklahoma
  4. 2.6 15 km SSE of Waynoka, Oklahoma
  5. 3.6 17 km SE of Waynoka, Oklahoma
  6. 2.6 14 km SSE of Waynoka, Oklahoma
  7. 2.8 15 km SSE of Waynoka, Oklahoma
  8. 3.3 17 km SE of Waynoka, Oklahoma
  9. 2.4 12 km NNE of Woodward, Oklahoma
  10. 2.6 14 km WNW of Alva, Oklahoma
  11. 3.1 28 km ENE of Buffalo, Oklahoma
  12. 3.7 9 km SW of Waynoka, Oklahoma
  13. 2.5 9 km SW of Waynoka, Oklahoma
  14. 2.9 9 km SW of Waynoka, Oklahoma
  15. 2.8 8 km SW 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 1,400 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.