QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

3 km WNW of Winlock, Washington

· -0.4 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wahkiakum County 41 kmCowlitz County 42 kmLewis County 47 kmThurston County 49 kmPacific County 61 kmColumbia County 63 kmClatsop County 77 kmPierce County 88 kmClark 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 1.9 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Wahkiakum County, 41 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1494 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 46.5077, -122.9842. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wahkiakum County, WA 41 km (26 mi) NE of here earthquakes near Wahkiakum County
Cowlitz County, WA 42 km (26 mi) NW of here earthquakes near Cowlitz County
Lewis County, WA 47 km (29 mi) W of here earthquakes near Lewis County
Thurston County, WA 49 km (30 mi) SSW of here earthquakes near Thurston County
Pacific County, WA 61 km (38 mi) E of here earthquakes near Pacific County
Columbia County, OR 63 km (39 mi) N of here earthquakes near Columbia County

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

Aftershocks so far

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

  1. 1.6 5 km W of Clatskanie, Oregon
  2. 2.0 19 km SE of Toledo, Washington
  3. 1.7 6 km WSW of Napavine, Washington
  4. 1.7 10 km SSE of Toledo, Washington
  5. 1.7 3 km S of Pe Ell, Washington
  6. 2.0 1 km N of Longview, Washington
  7. 1.5 5 km WSW of Napavine, Washington
  8. 2.2 5 km SW of Napavine, Washington
  9. 1.5 17 km NNW of Pe Ell, Washington
  10. 1.8 10 km NE of Castle Rock, Washington
  11. 1.7 3 km SW of Cathlamet, Washington
  12. 1.6 2 km N of Onalaska, Washington
  13. 2.9 3 km N of Onalaska, Washington
  14. 1.8 4 km NW of Winlock, Washington
  15. 1.5 6 km ESE of East Cathlamet, 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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