QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

26 km S of Morton, Washington

· 4.0 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 30 kmCowlitz County 37 kmSkamania County 40 kmClark County 65 kmColumbia County 78 kmPierce County 81 kmThurston County 82 kmMultnomah County 88 kmWahkiakum County 92 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
4.0 km below the surface
Felt
no reports yet
Nearest
Lewis County, 30 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 799 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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 46.3263, -122.2323. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 30 km (19 mi) SSE of here earthquakes near Lewis County
Cowlitz County, WA 37 km (23 mi) ENE of here earthquakes near Cowlitz County
Skamania County, WA 40 km (25 mi) NNW of here earthquakes near Skamania County
Clark County, WA 65 km (40 mi) NNE of here earthquakes near Clark County
Columbia County, OR 78 km (49 mi) ENE of here earthquakes near Columbia County
Pierce County, WA 81 km (50 mi) S of here earthquakes near Pierce 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. 1.9 6 km E of Mossyrock, Washington
  2. 1.5 20 km SSW of Morton, Washington
  3. 1.8 37 km NNE of Amboy, Washington
  4. 1.5 28 km SSE of Mossyrock, Washington
  5. 3.5 20 km S of Morton, Washington
  6. 1.9 15 km S of Morton, Washington
  7. 2.1 20 km SSE of Mossyrock, Washington
  8. 2.0 11 km S of Morton, Washington
  9. 1.7 24 km N of Amboy, Washington
  10. 1.7 24 km N of Amboy, Washington
  11. 2.0 38 km NNE of Amboy, Washington
  12. 1.6 6 km ENE of Mossyrock, Washington
  13. 1.6 2 km N of Onalaska, Washington
  14. 2.9 3 km N of Onalaska, Washington
  15. 1.6 27 km S of Morton, 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.