QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2mb_lg

7 km SSW of Helena, Oklahoma

· 5.0 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Alfalfa County 26 kmMajor County 29 kmGarfield County 49 kmWoods County 56 kmGrant County 57 kmBlaine County 69 kmKingfisher County 69 kmHarper County 80 kmDewey County 85 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 2.2 (mb_lg)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Alfalfa County, 26 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3277 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 36.4922, -98.3123. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Alfalfa County, OK 26 km (16 mi) S of here earthquakes near Alfalfa County
Major County, OK 29 km (18 mi) NE of here earthquakes near Major County
Garfield County, OK 49 km (30 mi) WNW of here earthquakes near Garfield County
Woods County, OK 56 km (35 mi) ESE of here earthquakes near Woods County
Grant County, OK 57 km (36 mi) SW of here earthquakes near Grant County
Blaine County, OK 69 km (43 mi) N of here earthquakes near Blaine County

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

Aftershocks so far

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

  1. 2.9 1 km NNW of Lambert, Oklahoma
  2. 2.5 5 km S of Nash, Oklahoma
  3. 2.5 15 km SSE of Waynoka, Oklahoma
  4. 2.5 16 km SSE of Waynoka, Oklahoma
  5. 3.4 15 km SSE of Waynoka, Oklahoma
  6. 3.1 15 km SSE of Waynoka, Oklahoma
  7. 2.5 16 km SSE of Waynoka, Oklahoma
  8. 2.7 17 km SSE of Waynoka, Oklahoma
  9. 3.0 1 km SSW of Cherokee, Oklahoma
  10. 3.0 1 km SSW of Cherokee, Oklahoma
  11. 2.5 2 km WSW of Aline, Oklahoma
  12. 2.5 6 km S of Goltry, Oklahoma
  13. 2.9 17 km SE of Waynoka, Oklahoma
  14. 2.8 16 km SE of Waynoka, Oklahoma
  15. 3.5 6 km NE of Carmen, 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 22,000 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.