QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

6 km ESE of East Cathlamet, Washington

· -0.5 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wahkiakum County 16 kmColumbia County 31 kmClatsop County 37 kmCowlitz County 47 kmPacific County 56 kmWashington County 72 kmClark County 77 kmLewis County 83 kmTillamook County 89 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 1.5 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Wahkiakum County, 16 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 914 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 46.1835, -123.2873. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Wahkiakum County, WA 16 km (10 mi) SE of here earthquakes near Wahkiakum County
Columbia County, OR 31 km (19 mi) NNW of here earthquakes near Columbia County
Clatsop County, OR 37 km (23 mi) ENE of here earthquakes near Clatsop County
Cowlitz County, WA 47 km (29 mi) W of here earthquakes near Cowlitz County
Pacific County, WA 56 km (35 mi) SE of here earthquakes near Pacific County
Washington County, OR 72 km (44 mi) NNW of here earthquakes near Washington County

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

Aftershocks so far

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

  1. 2.0 3 km NNE of Winlock, Washington
  2. 1.8 4 km NW of Winlock, Washington
  3. 1.6 10 km SSE of Toledo, Washington
  4. 1.8 10 km NE of Castle Rock, Washington
  5. 1.6 6 km NNW of Clatskanie, Oregon
  6. 1.5 10 km NE of Castle Rock, Washington
  7. 1.6 7 km NE of Castle Rock, Washington
  8. 1.7 10 km NE of Castle Rock, Washington
  9. 1.9 2 km WNW of Saint Helens, Oregon
  10. 2.2 5 km WSW of Napavine, Washington
  11. 2.4 10 km ESE of Pe Ell, Washington
  12. 1.6 3 km E of East Cathlamet, Washington
  13. 1.6 14 km ENE of East Cathlamet, Washington
  14. 1.6 6 km NNW of Winlock, Washington
  15. 1.7 8 km SW of Vernonia, 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.