QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

12 km WSW of Alder, Washington

· 20 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 21 kmThurston County 35 kmPierce County 39 kmCowlitz County 65 kmMason County 86 kmSkamania County 90 kmWahkiakum County 91 kmKing County 93 kmKitsap 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 1.6 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Lewis County, 21 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 464 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 46.7595, -122.4417. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 21 km (13 mi) NNW of here earthquakes near Lewis County
Thurston County, WA 35 km (22 mi) ESE of here earthquakes near Thurston County
Pierce County, WA 39 km (24 mi) SW of here earthquakes near Pierce County
Cowlitz County, WA 65 km (40 mi) NNE of here earthquakes near Cowlitz County
Mason County, WA 86 km (53 mi) SE of here earthquakes near Mason County
Skamania County, WA 90 km (56 mi) NNW of here earthquakes near Skamania County

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

Aftershocks so far

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

  1. 1.7 1 km SE of Kapowsin, Washington
  2. 2.0 10 km ESE of Ashford, Washington
  3. 1.8 7 km SSE of Mossyrock, Washington
  4. 1.5 2 km WNW of Kapowsin, Washington
  5. 1.5 14 km SSW of Alder, Washington
  6. 1.6 2 km ESE of Kapowsin, Washington
  7. 1.9 21 km SSE of Mossyrock, Washington
  8. 1.6 0 km SSE of Kapowsin, Washington
  9. 1.5 1 km ESE of Kapowsin, Washington
  10. 2.0 7 km SE of Mineral, Washington
  11. 2.5 7 km SE of Mineral, Washington
  12. 1.8 10 km SE of Carbonado, Washington
  13. 2.3 17 km NNE of Ashford, Washington
  14. 2.2 5 km WSW of Napavine, Washington
  15. 1.5 6 km SE of Mineral, 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.