QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

14 km WSW of Alder, Washington

· 19 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 19 kmThurston County 35 kmPierce County 42 kmCowlitz County 62 kmMason County 87 kmWahkiakum County 88 kmSkamania County 89 kmKing County 96 kmColumbia County 100 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 1.9 (ml)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Lewis County, 19 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 566 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 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 46.7388, -122.4648. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 19 km (12 mi) NNW of here earthquakes near Lewis County
Thurston County, WA 35 km (22 mi) SE of here earthquakes near Thurston County
Pierce County, WA 42 km (26 mi) SW of here earthquakes near Pierce County
Cowlitz County, WA 62 km (39 mi) NNE of here earthquakes near Cowlitz County
Mason County, WA 87 km (54 mi) SE of here earthquakes near Mason County
Wahkiakum County, WA 88 km (55 mi) NE of here earthquakes near Wahkiakum 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. 1.8 10 km SSE of Mossyrock, Washington
  2. 2.5 15 km SSE of Ashford, Washington
  3. 1.6 18 km NNE of Ashford, Washington
  4. 1.9 11 km NNW of Morton, Washington
  5. 1.5 14 km SSW of Morton, Washington
  6. 2.1 5 km SE of Mossyrock, Washington
  7. 1.6 4 km NE of Mossyrock, Washington
  8. 1.8 1 km ESE of Kapowsin, Washington
  9. 1.5 11 km SSE of Toledo, Washington
  10. 2.4 3 km ESE of Mossyrock, Washington
  11. 1.6 2 km S of Kapowsin, Washington
  12. 2.0 6 km NNW of Mossyrock, Washington
  13. 2.4 Washington
  14. 1.6 15 km NNE of Ashford, Washington
  15. 1.8 11 km SSE of Toledo, 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.