QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

14 km SSW of Alder, Washington

· 17 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 11 kmPierce County 44 kmThurston County 45 kmCowlitz County 59 kmSkamania County 80 kmWahkiakum County 92 kmMason County 96 kmKing County 98 kmColumbia County 99 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
17 km below the surface
Felt
no reports yet
Nearest
Lewis County, 11 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 152 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 46.6828, -122.3642. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 11 km (7 mi) N of here earthquakes near Lewis County
Pierce County, WA 44 km (27 mi) SSW of here earthquakes near Pierce County
Thurston County, WA 45 km (28 mi) SE of here earthquakes near Thurston County
Cowlitz County, WA 59 km (37 mi) NNE of here earthquakes near Cowlitz County
Skamania County, WA 80 km (50 mi) NNW of here earthquakes near Skamania County
Wahkiakum County, WA 92 km (57 mi) ENE of here earthquakes near Wahkiakum County

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

Aftershocks so far

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

  1. 0.3 11 km SSE of Carbonado, Washington
  2. 0.3 18 km SSE of Carbonado, Washington
  3. 0.7 5 km SSW of Morton, Washington
  4. 0.1 20 km SE of Carbonado, Washington
  5. 0.3 12 km NNE of Ashford, Washington
  6. 2.1 3 km NNW of Kapowsin, Washington
  7. 1.0 4 km WSW of Mineral, Washington
  8. 1.3 14 km NNE of Ashford, Washington
  9. 1.2 12 km S of Rainier, Washington
  10. 1.1 5 km SW of Morton, Washington
  11. 1.5 5 km SSW of Morton, Washington
  12. -0.1 16 km NNE of Ashford, Washington
  13. 1.5 11 km NE of Ashford, Washington
  14. 1.7 6 km W of Mossyrock, Washington
  15. 1.8 3 km SW of Kapowsin, 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.