QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

14 km SW of Alder, Washington

· 15 km deep · released about 100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 15 kmThurston County 40 kmPierce County 43 kmCowlitz County 61 kmSkamania County 84 kmWahkiakum County 90 kmMason County 91 kmKing County 97 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 2.4 (ml)
Depth
15 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Lewis County, 15 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 848 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.4× the energy of this one
  4. This earthquake M 2.4 about 100 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 46.7107, -122.4188. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 15 km (9 mi) NNW of here earthquakes near Lewis County
Thurston County, WA 40 km (25 mi) SE of here earthquakes near Thurston County
Pierce County, WA 43 km (27 mi) SSW of here earthquakes near Pierce County
Cowlitz County, WA 61 km (38 mi) NNE of here earthquakes near Cowlitz County
Skamania County, WA 84 km (52 mi) NNW of here earthquakes near Skamania County
Wahkiakum County, WA 90 km (56 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

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

  1. 1.7 1 km SE of Kapowsin, Washington
  2. 1.5 1 km WSW of Kapowsin, Washington
  3. 2.1 6 km SE of Mossyrock, Washington
  4. 1.8 2 km ESE of Kapowsin, Washington
  5. 1.6 10 km ENE of Ashford, Washington
  6. 1.6 1 km SW of Kapowsin, Washington
  7. 1.7 10 km E of Ashford, Washington
  8. 1.8 1 km WSW of Kapowsin, Washington
  9. 1.5 12 km NE of Ashford, Washington
  10. 2.0 17 km NNE of Ashford, Washington
  11. 1.5 6 km SW of Morton, Washington
  12. 2.5 14 km SSE of Ashford, Washington
  13. 1.6 8 km SSE of McKenna, Washington
  14. 1.6 19 km SSE of Mossyrock, Washington
  15. 1.6 18 km SSE of Mossyrock, 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.