QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

7 km ESE of Medford, Oklahoma

· 3.2 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grant County 12 kmKay County 46 kmGarfield County 47 kmSumner County 52 kmHarper County 58 kmNoble County 58 kmAlfalfa County 60 kmCowley County 88 kmMajor County 95 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 1.9 (ml)
Depth
3.2 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Grant County, 12 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 996 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 36.7858, -97.6562. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grant County, OK 12 km (7 mi) E of here earthquakes near Grant County
Kay County, OK 46 km (28 mi) W of here earthquakes near Kay County
Garfield County, OK 47 km (29 mi) NNE of here earthquakes near Garfield County
Sumner County, KS 52 km (32 mi) SSW of here earthquakes near Sumner County
Harper County, KS 58 km (36 mi) SE of here earthquakes near Harper County
Noble County, OK 58 km (36 mi) NW of here earthquakes near Noble 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. 1.7 7 km N of Nardin, Oklahoma
  2. 1.7 7 km NNE of Nardin, Oklahoma
  3. 2.3 8 km E of Nescatunga, Oklahoma
  4. 2.0 7 km N of Nardin, Oklahoma
  5. 1.9 6 km N of Nardin, Oklahoma
  6. 1.9 9 km ESE of Jefferson, Oklahoma
  7. 1.6 12 km SSE of Waldron, Kansas
  8. 2.2 12 km ENE of Nescatunga, Oklahoma
  9. 2.3 8 km SE of Wakita, Oklahoma
  10. 1.6 4 km NE of Medford, Oklahoma
  11. 2.2 9 km ESE of Jefferson, Oklahoma
  12. 3.3 9 km ESE of Jefferson, Oklahoma
  13. 3.4 10 km ESE of Jefferson, Oklahoma
  14. 3.2 8 km E of Nescatunga, Oklahoma
  15. 2.0 8 km NNW of Deer Creek, 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 4.5 on 2022-01-31 — it released about 7,900 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.