QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

3 km N of Onalaska, Washington

· 24 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 26 kmThurston County 38 kmCowlitz County 46 kmWahkiakum County 65 kmPierce County 65 kmColumbia County 79 kmPacific County 82 kmSkamania County 87 kmMason County 90 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 2.9 (ml)
Depth
24 km below the surface
Felt
35 reports · strongest reported intensity III
Nearest
Lewis County, 26 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 837 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 35 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 46.6068, -122.7103. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 26 km (16 mi) W of here earthquakes near Lewis County
Thurston County, WA 38 km (23 mi) SSE of here earthquakes near Thurston County
Cowlitz County, WA 46 km (28 mi) N of here earthquakes near Cowlitz County
Wahkiakum County, WA 65 km (40 mi) ENE of here earthquakes near Wahkiakum County
Pierce County, WA 65 km (40 mi) SW of here earthquakes near Pierce County
Columbia County, OR 79 km (49 mi) NNE of here earthquakes near Columbia County

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

Aftershocks so far

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

  1. 2.1 9 km S of Morton, Washington
  2. 2.7 7 km ESE of Mossyrock, Washington
  3. 2.6 9 km S of Morton, Washington
  4. 1.8 25 km S of Morton, Washington
  5. 1.7 5 km SW of Napavine, Washington
  6. 2.2 11 km WSW of Mineral, Washington
  7. 1.6 6 km WSW of Castle Rock, Washington
  8. 1.6 10 km NE of Castle Rock, Washington
  9. 1.6 10 km NE of Castle Rock, Washington
  10. 2.1 6 km SE of Mossyrock, Washington
  11. 2.3 5 km W of Napavine, Washington
  12. 1.5 6 km SW of Morton, Washington
  13. 1.6 8 km SSE of McKenna, Washington
  14. 1.6 19 km SSE of Mossyrock, Washington
  15. 1.6 18 km SSE of Mossyrock, 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.