QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

1 km WSW of Onalaska, Washington

· 22 km deep · released about 610 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 28 kmThurston County 41 kmCowlitz County 42 kmWahkiakum County 61 kmPierce County 70 kmColumbia County 75 kmPacific County 80 kmSkamania County 86 kmClark County 91 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
22 km below the surface
Felt
7 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Lewis County, 28 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2062 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 610 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 25,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 18,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.6× the energy of this one
  4. This earthquake M 2.9 about 610 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 46.5708, -122.7377. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 28 km (17 mi) W of here earthquakes near Lewis County
Thurston County, WA 41 km (26 mi) S of here earthquakes near Thurston County
Cowlitz County, WA 42 km (26 mi) N of here earthquakes near Cowlitz County
Wahkiakum County, WA 61 km (38 mi) ENE of here earthquakes near Wahkiakum County
Pierce County, WA 70 km (43 mi) SW of here earthquakes near Pierce County
Columbia County, OR 75 km (46 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

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

  1. 1.7 10 km NE of Castle Rock, Washington
  2. 1.6 1 km W of Winlock, Washington
  3. 1.8 6 km NW of Winlock, Washington
  4. 1.8 10 km NE of Castle Rock, Washington
  5. 1.6 9 km NE of Castle Rock, Washington
  6. 1.9 3 km WNW of Winlock, Washington
  7. 1.7 11 km SSW of Morton, Washington
  8. 2.2 11 km SSW of Morton, Washington
  9. 2.0 Washington
  10. 1.5 3 km W of Winlock, Washington
  11. 1.6 15 km E of Castle Rock, Washington
  12. 1.9 14 km WSW of Alder, Washington
  13. 2.1 8 km SSW of Morton, Washington
  14. 2.0 21 km E of Castle Rock, Washington
  15. 1.7 3 km W of Winlock, 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.