QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

4 km W of West Longview, Washington

· -0.3 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Columbia County 25 kmCowlitz County 29 kmWahkiakum County 32 kmClatsop County 53 kmClark County 62 kmWashington County 68 kmLewis County 69 kmPacific County 71 kmMultnomah County 84 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 1.6 (ml)
Depth
-0.3 km below the surface
Felt
no reports yet
Nearest
Columbia County, 25 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2064 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 46.1642, -123.0533. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Columbia County, OR 25 km (15 mi) N of here earthquakes near Columbia County
Cowlitz County, WA 29 km (18 mi) W of here earthquakes near Cowlitz County
Wahkiakum County, WA 32 km (20 mi) ESE of here earthquakes near Wahkiakum County
Clatsop County, OR 53 km (33 mi) ENE of here earthquakes near Clatsop County
Clark County, WA 62 km (38 mi) NW of here earthquakes near Clark County
Washington County, OR 68 km (42 mi) N of here earthquakes near Washington County

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

Aftershocks so far

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

  1. 1.8 11 km SSE of Toledo, Washington
  2. 1.5 6 km ENE of Prescott, Oregon
  3. 1.7 7 km ENE of Prescott, Oregon
  4. 1.5 8 km WSW of Napavine, Washington
  5. 1.8 5 km NNW of Winlock, Washington
  6. 1.7 3 km NNE of La Center, Washington
  7. 1.7 10 km NE of Castle Rock, Washington
  8. 2.1 9 km ENE of Kalama, Washington
  9. 1.6 1 km W of Winlock, Washington
  10. 1.8 6 km NW of Winlock, Washington
  11. 1.8 10 km NE of Castle Rock, Washington
  12. 1.6 9 km NE of Castle Rock, Washington
  13. 1.6 2 km WNW of Saint Helens, Oregon
  14. 2.1 1 km WNW of Deer Island, Oregon
  15. 1.7 1 km SW of Columbia City, Oregon

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.