QuakeIndex

explosion · reviewed by a seismologist

M 2.2ml

18 km NW of Pomeroy, Washington

· -0.2 km deep · released about 52 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Garfield County 26 kmColumbia County 35 kmWhitman County 40 kmAsotin County 62 kmWalla Walla County 65 kmAdams County 73 kmNez Perce County 83 kmLatah County 84 kmFranklin 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 2.2 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
Garfield County, 26 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 566 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 52 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 5.8 290,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 52 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 46.5902, -117.7800. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Garfield County, WA 26 km (16 mi) NW of here earthquakes near Garfield County
Columbia County, WA 35 km (21 mi) NNE of here earthquakes near Columbia County
Whitman County, WA 40 km (25 mi) SSW of here earthquakes near Whitman County
Asotin County, WA 62 km (39 mi) NW of here earthquakes near Asotin County
Walla Walla County, WA 65 km (41 mi) NE of here earthquakes near Walla Walla County
Adams County, WA 73 km (45 mi) SE of here earthquakes near Adams County

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

Aftershocks so far

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

  1. 1.9 6 km WSW of Dayton, Washington
  2. 1.7 15 km NW of Pomeroy, Washington
  3. 1.6 5 km SW of Dayton, Washington
  4. 1.8 14 km E of Pomeroy, Washington
  5. 1.7 6 km WSW of Dayton, Washington
  6. 2.0 2 km NE of Colfax, Washington
  7. 2.0 16 km WNW of Pomeroy, Washington
  8. 1.7 6 km WSW of Dayton, Washington
  9. 1.6 7 km SW of Dayton, Washington
  10. 1.9 7 km WSW of Dayton, Washington
  11. 1.7 7 km ENE of Waitsburg, Washington
  12. 1.8 7 km ENE of Waitsburg, Washington
  13. 1.8 5 km E of Waitsburg, Washington
  14. 1.6 7 km WSW of Dayton, Washington
  15. 1.9 7 km ENE of Waitsburg, Washington

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

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