QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

25 km S of Mossyrock, Washington

· -1.0 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 17 kmLewis County 33 kmSkamania County 54 kmColumbia County 59 kmClark County 60 kmWahkiakum County 69 kmThurston County 74 kmMultnomah County 85 kmPierce County 88 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
-1.0 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 17 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2593 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 5.4 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 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 46.3062, -122.5302. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 17 km (10 mi) NE of here earthquakes near Cowlitz County
Lewis County, WA 33 km (20 mi) SSW of here earthquakes near Lewis County
Skamania County, WA 54 km (34 mi) NW of here earthquakes near Skamania County
Columbia County, OR 59 km (36 mi) NE of here earthquakes near Columbia County
Clark County, WA 60 km (37 mi) N of here earthquakes near Clark County
Wahkiakum County, WA 69 km (43 mi) E of here earthquakes near Wahkiakum County

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

Aftershocks so far

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

  1. 2.1 29 km E of Castle Rock, Washington
  2. 1.6 21 km E of Castle Rock, Washington
  3. 1.9 10 km SSE of Toledo, Washington
  4. 1.7 20 km SE of Toledo, Washington
  5. 1.7 1 km SSE of Prescott, Oregon
  6. 1.6 7 km ENE of Prescott, Oregon
  7. 2.3 14 km ENE of Yacolt, Washington
  8. 1.7 3 km NW of West Longview, Washington
  9. 1.9 23 km NE of Amboy, Washington
  10. 2.2 37 km SSE of Morton, Washington
  11. 1.6 4 km W of West Longview, Washington
  12. 1.6 14 km SE of Mossyrock, Washington
  13. 1.6 15 km ESE of Morton, Washington
  14. 1.7 20 km N of Amboy, Washington
  15. 1.5 28 km NNW of Amboy, 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.