QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

14 km E of Pomeroy, Washington

· -0.8 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Garfield County 11 kmAsotin County 38 kmColumbia County 44 kmWhitman County 47 kmNez Perce County 54 kmLatah County 64 kmLewis County 82 kmWalla Walla County 85 kmBenewah County 101 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 1.8 (ml)
Depth
-0.8 km below the surface
Felt
no reports yet
Nearest
Garfield County, 11 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 313 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 46.4925, -117.4213. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Garfield County, WA 11 km (7 mi) NE of here earthquakes near Garfield County
Asotin County, WA 38 km (23 mi) NNW of here earthquakes near Asotin County
Columbia County, WA 44 km (27 mi) ENE of here earthquakes near Columbia County
Whitman County, WA 47 km (29 mi) S of here earthquakes near Whitman County
Nez Perce County, ID 54 km (33 mi) WNW of here earthquakes near Nez Perce County
Latah County, ID 64 km (40 mi) SW of here earthquakes near Latah County

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

Aftershocks so far

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

  1. 2.3 1 km NW of Asotin, Washington
  2. 2.1 5 km ENE of Pullman, Washington
  3. 1.7 4 km E of Uniontown, Washington
  4. 2.3 4 km ENE of Pullman, Washington
  5. 1.7 15 km NW of Pomeroy, Washington
  6. 2.3 5 km SSW of Moscow, Idaho
  7. 1.6 8 km SSE of Pullman, Washington
  8. 2.1 2 km SSE of Lewiston Orchards, Idaho
  9. 2.2 2 km NE of Lewiston Orchards, Idaho

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.