QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

Earthquake near Thayer, MO

USGS: 20 km SSE of Alton, Missouri

12:00 pm CST, Mar 7, 2020 · · 2.9 km deep · released about 62 lb of TNT

Every earthquake near Thayer Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Oregon County 20 kmRandolph County 32 kmRipley County 40 kmSharp County 42 kmFulton County 49 kmCarter County 56 kmLawrence County 57 kmHowell County 60 kmShannon County 70 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
12:00 pm CST on 7 March 2020 ()
Where
22 km (13 mi) E of Thayer, MO · earthquakes near Thayer
Magnitude
M 2.2 (md)
Depth
2.9 km below the surface
Felt
no reports yet
Nearest
Oregon County, 20 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2323 days ago

A magnitude 2.2 earthquake was recorded 22 km (13 mi) E of Thayer, MO, at 12:00 pm CST on 7 March 2020 (18:00 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 62 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 5.8 240,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 170,000× the energy of this one
  3. Around the size people start to feel M 3.0 15× the energy of this one
  4. This earthquake M 2.2 about 62 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 36.5250, -91.2968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Oregon County, MO 20 km (13 mi) NNW earthquakes near Oregon County
Randolph County, AR 32 km (20 mi) SE earthquakes near Randolph County
Ripley County, MO 40 km (25 mi) ENE earthquakes near Ripley County
Sharp County, AR 42 km (26 mi) SSW earthquakes near Sharp County
Fulton County, AR 49 km (31 mi) WSW earthquakes near Fulton County
Carter County, MO 56 km (35 mi) NNE earthquakes near Carter 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. 1.5 5 km WNW of Powhatan, Arkansas
  2. 2.2 6 km WNW of Powhatan, Arkansas
  3. 2.1 11 km SE of Ash Flat, Arkansas
  4. 2.2 4 km SE of Ash Flat, Arkansas
  5. 2.2 6 km WNW of Powhatan, Arkansas
  6. 1.8 6 km N of Black Rock, Arkansas
  7. 2.2 10 km W of Maynard, Arkansas
  8. 2.0 6 km NE of Ravenden Springs, Arkansas
  9. 2.0 6 km NNW of Black Rock, Arkansas
  10. 2.1 5 km SE of Ash Flat, Arkansas
  11. 2.3 9 km NNW of Cherokee Village, Arkansas
  12. 1.5 4 km NE of Black Rock, Arkansas
  13. 1.7 3 km WNW of Powhatan, Arkansas
  14. 1.6 5 km N of Black Rock, Arkansas
  15. 1.8 4 km WNW of Powhatan, 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.