QuakeIndex

explosion · reviewed by a seismologist

M 1.9ml

13 km NW of West Longview, Washington

· -0.3 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wahkiakum County 24 kmColumbia County 34 kmCowlitz County 35 kmClatsop County 51 kmPacific County 61 kmLewis County 68 kmClark County 72 kmWashington County 77 kmThurston County 80 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Wahkiakum County, 24 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 231 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 25 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 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 46.2490, -123.1240. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wahkiakum County, WA 24 km (15 mi) ESE of here earthquakes near Wahkiakum County
Columbia County, OR 34 km (21 mi) N of here earthquakes near Columbia County
Cowlitz County, WA 35 km (22 mi) W of here earthquakes near Cowlitz County
Clatsop County, OR 51 km (32 mi) ENE of here earthquakes near Clatsop County
Pacific County, WA 61 km (38 mi) SE of here earthquakes near Pacific County
Lewis County, WA 68 km (42 mi) WSW of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 1.3 20 km E of Castle Rock, Washington
  2. 0.7 21 km ESE of Castle Rock, Washington
  3. 0.9 20 km E of Castle Rock, Washington
  4. 0.6 21 km ESE of Castle Rock, Washington
  5. 1.7 20 km E of Castle Rock, Washington
  6. 3.8 20 km E of Castle Rock, Washington
  7. 1.8 3 km E of Kalama, Washington
  8. 1.5 3 km WSW of Kalama, Washington
  9. 1.6 20 km E of Castle Rock, Washington
  10. 1.5 11 km ENE of East Cathlamet, Washington
  11. 1.5 6 km NW of Winlock, Washington
  12. 1.6 4 km NNE of Kalama, Washington
  13. 2.0 3 km NNE of Winlock, Washington
  14. 1.8 4 km NW of Winlock, Washington
  15. 1.6 12 km SW 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.