QuakeIndex

explosion · reviewed by a seismologist

M 2.1md

4 km E of Four Lakes, Washington

· -0.7 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Spokane County 11 kmKootenai County 64 kmLincoln County 66 kmWhitman County 74 kmBenewah County 78 kmStevens County 94 kmAdams County 96 kmLatah County 103 kmBonner County 108 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 2.1 (md)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Spokane County, 11 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1045 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 47 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 5.8 320,000× 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 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 47.5678, -117.5328. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Spokane County, WA 11 km (7 mi) WSW of here earthquakes near Spokane County
Kootenai County, ID 64 km (40 mi) W of here earthquakes near Kootenai County
Lincoln County, WA 66 km (41 mi) E of here earthquakes near Lincoln County
Whitman County, WA 74 km (46 mi) N of here earthquakes near Whitman County
Benewah County, ID 78 km (48 mi) WNW of here earthquakes near Benewah County
Stevens County, WA 94 km (59 mi) SSE of here earthquakes near Stevens County

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

Aftershocks so far

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

  1. 1.9 2 km NE of Fairwood, Washington
  2. 1.9 6 km ENE of Sprague, Washington
  3. 2.2 2 km NW of Mead, Washington
  4. 1.9 5 km ENE of Sprague, Washington
  5. 2.3 8 km NE of Sprague, Washington
  6. 1.7 6 km SE of Spangle, Washington
  7. 2.5 8 km ENE of Sprague, Washington
  8. 1.6 3 km ESE of Veradale, Washington
  9. 1.7 4 km SSW of Liberty Lake, Washington
  10. 2.0 6 km ENE of Sprague, Washington
  11. 1.6 13 km SSE of Liberty Lake, Washington
  12. 1.9 12 km N of Reardan, Washington
  13. 2.4 7 km ENE of Sprague, Washington
  14. 1.8 2 km NNE of Fairwood, Washington
  15. 2.3 2 km NNE of Fairwood, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.