QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km S of Putnam, Oklahoma

· 6.7 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 16 kmDewey County 22 kmBlaine County 51 kmWashita County 55 kmRoger Mills County 69 kmMajor County 71 kmWoodward County 76 kmEllis County 84 kmBeckham County 86 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
6.7 km below the surface
Felt
no reports yet
Nearest
Custer County, 16 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2064 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 35.7860, -98.9830. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Custer County, OK 16 km (10 mi) N of here earthquakes near Custer County
Dewey County, OK 22 km (13 mi) S of here earthquakes near Dewey County
Blaine County, OK 51 km (32 mi) WSW of here earthquakes near Blaine County
Washita County, OK 55 km (34 mi) N of here earthquakes near Washita County
Roger Mills County, OK 69 km (43 mi) E of here earthquakes near Roger Mills County
Major County, OK 71 km (44 mi) SW of here earthquakes near Major County

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

Aftershocks so far

47 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. 1.7 15 km ENE of Thomas, Oklahoma
  4. 1.8 16 km ENE of Thomas, Oklahoma
  5. 1.7 16 km ENE of Thomas, Oklahoma
  6. 1.5 15 km ENE of Thomas, Oklahoma
  7. 1.9 13 km ENE of Thomas, Oklahoma
  8. 2.0 15 km WSW of Watonga, Oklahoma
  9. 1.7 15 km ENE of Thomas, Oklahoma
  10. 1.7 Oklahoma
  11. 2.2 15 km WSW of Watonga, Oklahoma
  12. 1.8 15 km ENE of Thomas, Oklahoma
  13. 1.6 15 km ENE of Thomas, Oklahoma
  14. 1.9 15 km ENE of Thomas, Oklahoma
  15. 2.1 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.