QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Ash Flat, AR

USGS: 4 km E of Ash Flat, Arkansas

9:12 pm CST, Jan 30, 2020 · · 5.0 km deep · released about 46 lb of TNT

Every earthquake near Ash Flat Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sharp County 10 kmFulton County 29 kmIzard County 35 kmLawrence County 46 kmRandolph County 49 kmOregon County 53 kmIndependence County 54 kmStone County 66 kmHowell County 68 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
9:12 pm CST on 30 January 2020 ()
Where
4 km (3 mi) E of Ash Flat, AR · earthquakes near Ash Flat
Magnitude
M 2.1 (md)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Sharp County, 10 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2437 days ago

A magnitude 2.1 earthquake was recorded 4 km (3 mi) E of Ash Flat, AR, at 9:12 pm CST on 30 January 2020 (03:12 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Highland, Cherokee Village, Horseshoe Bend.

How big was it?

This earthquake released about 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 36.2228, -91.5585. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sharp County, AR 10 km (6 mi) SE earthquakes near Sharp County
Fulton County, AR 29 km (18 mi) NW earthquakes near Fulton County
Izard County, AR 35 km (22 mi) WSW earthquakes near Izard County
Lawrence County, AR 46 km (28 mi) ESE earthquakes near Lawrence County
Randolph County, AR 49 km (31 mi) ENE earthquakes near Randolph County
Oregon County, MO 53 km (33 mi) NNE earthquakes near Oregon County

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

Aftershocks so far

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

  1. 2.3 4 km SE of Franklin, Arkansas
  2. 2.1 2 km SSW of Lynn, Arkansas
  3. 1.9 5 km S of Imboden, Arkansas
  4. 2.0 3 km SSW of Imboden, Arkansas
  5. 3.1 4 km SSW of Imboden, Arkansas
  6. 1.9 2 km W of Lynn, Arkansas
  7. 2.3 6 km WSW of Ravenden, Arkansas
  8. 1.7 Missouri-Arkansas border region
  9. 1.7 2 km WSW of Imboden, Arkansas
  10. 2.1 2 km SE of Ravenden, Arkansas
  11. 1.9 3 km ESE of Ravenden, Arkansas
  12. 1.8 Missouri-Arkansas border region
  13. 1.9 8 km SSE of Williford, Arkansas
  14. 2.1 7 km SW of Ravenden, Arkansas
  15. 1.7 6 km SW of Ravenden, Arkansas

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.