QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near Ada, OK

USGS: 6 km SSW of Stonewall, Oklahoma

9:45 pm CST, Jan 21, 2020 · · 7.0 km deep · released about 25 lb of TNT

Every earthquake near Ada Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pontotoc County 19 kmCoal County 24 kmJohnston County 33 kmMurray County 50 kmAtoka County 52 kmHughes County 58 kmSeminole County 63 kmMarshall County 66 kmGarvin County 71 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
9:45 pm CST on 21 January 2020 ()
Where
23 km (15 mi) SSE of Ada, OK · earthquakes near Ada
Magnitude
M 1.9 (ml)
Depth
7.0 km below the surface
Felt
no reports yet
Nearest
Pontotoc County, 19 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2446 days ago

A magnitude 1.9 earthquake was recorded 23 km (15 mi) SSE of Ada, OK, at 9:45 pm CST on 21 January 2020 (03:45 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 34.5943, -96.5458. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Pontotoc County, OK 19 km (12 mi) NW earthquakes near Pontotoc County
Coal County, OK 24 km (15 mi) E earthquakes near Coal County
Johnston County, OK 33 km (20 mi) SSW earthquakes near Johnston County
Murray County, OK 50 km (31 mi) WSW earthquakes near Murray County
Atoka County, OK 52 km (32 mi) ESE earthquakes near Atoka County
Hughes County, OK 58 km (36 mi) NNE earthquakes near Hughes County

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

Aftershocks so far

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

  1. 1.5 10 km WNW of Caney, Oklahoma
  2. 1.9 3 km SE of Mill Creek, Oklahoma
  3. 1.9 5 km SW of Mill Creek, Oklahoma
  4. 1.8 3 km SE of Mill Creek, Oklahoma
  5. 1.8 3 km WSW of Mill Creek, Oklahoma
  6. 1.6 10 km W of Caney, Oklahoma
  7. 1.7 3 km WSW of Mill Creek, Oklahoma
  8. 1.7 2 km SSE of Mill Creek, Oklahoma
  9. 1.8 3 km SW of Mill Creek, Oklahoma
  10. 1.6 12 km SSE of Wapanucka, Oklahoma
  11. 1.6 Oklahoma
  12. 1.7 8 km S of Wapanucka, Oklahoma
  13. 2.0 4 km SSW of Mill Creek, Oklahoma
  14. 1.5 12 km NNW of Kenefic, Oklahoma
  15. 1.7 3.5 km NE of Mill Creek, OK

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.