QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Ash Flat, AR

USGS: 12 km SE of Ash Flat, Arkansas

10:02 pm CST, Nov 9, 2016 · · 2.5 km deep · released about 21 lb of TNT

Every earthquake near Ash Flat Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sharp County 4 kmIzard County 37 kmLawrence County 38 kmFulton County 38 kmIndependence County 46 kmRandolph County 48 kmOregon County 60 kmStone County 66 kmJackson County 66 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
10:02 pm CST on 9 November 2016 ()
Where
13 km (8 mi) SE of Ash Flat, AR · earthquakes near Ash Flat
Magnitude
M 1.9 (md)
Depth
2.5 km below the surface
Felt
no reports yet
Nearest
Sharp County, 4 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3614 days ago

A magnitude 1.9 earthquake was recorded 13 km (8 mi) SE of Ash Flat, AR, at 10:02 pm CST on 9 November 2016 (04:02 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, Cave City, Horseshoe Bend.

How big was it?

This earthquake released about 21 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 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 36.1495, -91.5020. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sharp County, AR 4 km (2 mi) NE earthquakes near Sharp County
Izard County, AR 37 km (23 mi) W earthquakes near Izard County
Lawrence County, AR 38 km (24 mi) ESE earthquakes near Lawrence County
Fulton County, AR 38 km (24 mi) NW earthquakes near Fulton County
Independence County, AR 46 km (29 mi) S earthquakes near Independence County
Randolph County, AR 48 km (30 mi) ENE earthquakes near Randolph County

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

Aftershocks so far

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

  1. 2.1 4 km NW of Mount Pleasant, Arkansas
  2. 2.1 6 km WNW of Powhatan, Arkansas
  3. 1.6 4 km NE of Black Rock, Arkansas
  4. 1.8 5 km WNW of Powhatan, Arkansas
  5. 1.5 5 km WNW of Powhatan, Arkansas
  6. 2.2 6 km WNW of Powhatan, Arkansas
  7. 2.1 11 km SE of Ash Flat, Arkansas
  8. 2.2 4 km SE of Ash Flat, Arkansas
  9. 2.1 3 km NW of Mount Pleasant, Arkansas
  10. 1.7 2 km W of Powhatan, Arkansas
  11. 2.2 6 km WNW of Powhatan, Arkansas
  12. 1.8 6 km N of Black Rock, Arkansas
  13. 2.0 6 km NE of Ravenden Springs, Arkansas
  14. 2.0 6 km NNW of Black Rock, Arkansas
  15. 2.1 5 km SE of Ash Flat, 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.