QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km WNW of Isabella, Oklahoma

· 5.0 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Major County 15 kmBlaine County 42 kmAlfalfa County 53 kmKingfisher County 54 kmGarfield County 56 kmDewey County 64 kmWoods County 67 kmGrant County 80 kmWoodward County 81 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
5.0 km below the surface
Felt
no reports yet
Nearest
Major County, 15 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 389 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 36.2557, -98.3967. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Major County, OK 15 km (9 mi) ESE of here earthquakes near Major County
Blaine County, OK 42 km (26 mi) N of here earthquakes near Blaine County
Alfalfa County, OK 53 km (33 mi) S of here earthquakes near Alfalfa County
Kingfisher County, OK 54 km (33 mi) NW of here earthquakes near Kingfisher County
Garfield County, OK 56 km (35 mi) WSW of here earthquakes near Garfield County
Dewey County, OK 64 km (39 mi) ENE of here earthquakes near Dewey 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. 1.6 2 km SSW of Watonga, Oklahoma
  2. 1.6 1 km S of Watonga, Oklahoma
  3. 1.8 2 km SSW of Watonga, Oklahoma
  4. 1.7 1 km S of Watonga, Oklahoma
  5. 1.6 1 km SSE of Watonga, Oklahoma
  6. 1.6 3 km SSW of Watonga, Oklahoma
  7. 1.6 1 km S of Watonga, Oklahoma
  8. 1.7 2 km NE of Watonga, Oklahoma
  9. 1.6 2 km NE of Watonga, Oklahoma
  10. 1.7 1 km SSE of Watonga, Oklahoma
  11. 1.6 3 km ENE of Watonga, Oklahoma
  12. 2.1 2 km NE of Watonga, Oklahoma
  13. 1.6 1 km NE of Watonga, Oklahoma
  14. 1.6 2 km NNE of Watonga, Oklahoma
  15. 1.7 15 km SSW of Loyal, 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 83,000 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.