QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

10 km NNW of Mooreland, Oklahoma

· 6.6 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Woodward County 10 kmWoods County 42 kmHarper County 48 kmEllis County 55 kmDewey County 64 kmMajor County 68 kmComanche County 74 kmAlfalfa County 87 kmClark County 93 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
6.6 km below the surface
Felt
no reports yet
Nearest
Woodward County, 10 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1713 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 36.5187, -99.2620. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Woodward County, OK 10 km (6 mi) N of here earthquakes near Woodward County
Woods County, OK 42 km (26 mi) WSW of here earthquakes near Woods County
Harper County, OK 48 km (30 mi) SE of here earthquakes near Harper County
Ellis County, OK 55 km (34 mi) NE of here earthquakes near Ellis County
Dewey County, OK 64 km (40 mi) NNW of here earthquakes near Dewey County
Major County, OK 68 km (42 mi) WNW of here earthquakes near Major 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. 1.8 14 km SE of Buffalo, Oklahoma
  2. 2.2 17 km SE of Waynoka, Oklahoma
  3. 3.0 17 km SE of Waynoka, Oklahoma
  4. 3.0 16 km SE of Waynoka, Oklahoma
  5. 1.7 8 km SW of Waynoka, Oklahoma
  6. 1.6 0 km ESE of Avard, Oklahoma
  7. 2.5 8 km WSW of Waynoka, Oklahoma
  8. 2.2 8 km WSW of Waynoka, Oklahoma
  9. 1.6 8 km WSW of Waynoka, Oklahoma
  10. 2.3 8 km WSW of Waynoka, Oklahoma
  11. 2.4 8 km WSW of Waynoka, Oklahoma
  12. 1.7 8 km WSW of Waynoka, Oklahoma
  13. 1.7 8 km WSW of Waynoka, Oklahoma
  14. 2.3 8 km WSW of Waynoka, Oklahoma
  15. 2.5 9 km WSW 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 4.7 on 2016-01-07 — it released about 27,000 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.