QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

13 km E of Seiling, Oklahoma

· 5.4 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Major County 28 kmDewey County 29 kmBlaine County 43 kmWoodward County 55 kmCuster County 59 kmWoods County 65 kmAlfalfa County 76 kmKingfisher County 78 kmEllis County 88 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 1.8 (ml)
Depth
5.4 km below the surface
Felt
no reports yet
Nearest
Major County, 28 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1294 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 36.1455, -98.7705. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Major County, OK 28 km (17 mi) SW of here earthquakes near Major County
Dewey County, OK 29 km (18 mi) NE of here earthquakes near Dewey County
Blaine County, OK 43 km (27 mi) NW of here earthquakes near Blaine County
Woodward County, OK 55 km (34 mi) SE of here earthquakes near Woodward County
Custer County, OK 59 km (37 mi) NNE of here earthquakes near Custer County
Woods County, OK 65 km (41 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

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

  1. 1.8 6 km WNW of Thomas, Oklahoma
  2. 1.6 6 km WNW of Thomas, Oklahoma
  3. 2.0 18 km ESE of Waynoka, Oklahoma
  4. 1.5 17 km SE of Waynoka, Oklahoma
  5. 1.9 16 km SE of Waynoka, Oklahoma
  6. 1.7 17 km SSE of Waynoka, Oklahoma
  7. 1.7 15 km ENE of Thomas, Oklahoma
  8. 2.0 Oklahoma
  9. 2.2 4 km NNE of Quinlan, Oklahoma
  10. 1.8 16 km ENE of Thomas, Oklahoma
  11. 1.7 16 km ENE of Thomas, Oklahoma
  12. 1.5 15 km ENE of Thomas, Oklahoma
  13. 1.9 13 km ENE of Thomas, Oklahoma
  14. 2.0 15 km WSW of Watonga, Oklahoma
  15. 1.7 15 km ENE of Thomas, 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 86,000 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.