QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

8 km WSW of Tumwater, Washington

· -0.2 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Thurston County 15 kmMason County 43 kmGrays Harbor County 64 kmPierce County 65 kmLewis County 66 kmPacific County 75 kmKitsap County 78 kmWahkiakum County 83 kmCowlitz County 91 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Thurston County, 15 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1059 days ago

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

USGS catalogues this as explosion, not an earthquake.

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 46.9815, -123.0095. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Thurston County, WA 15 km (9 mi) WNW of here earthquakes near Thurston County
Mason County, WA 43 km (27 mi) SSE of here earthquakes near Mason County
Grays Harbor County, WA 64 km (40 mi) ESE of here earthquakes near Grays Harbor County
Pierce County, WA 65 km (41 mi) W of here earthquakes near Pierce County
Lewis County, WA 66 km (41 mi) NW of here earthquakes near Lewis County
Pacific County, WA 75 km (47 mi) NE of here earthquakes near Pacific County

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

Aftershocks so far

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

  1. 1.7 13 km N of Onalaska, Washington
  2. 1.5 11 km S of Shelton, Washington
  3. 1.8 17 km WSW of Alder, Washington
  4. 1.6 8 km SSW of Grapeview, Washington
  5. 1.6 7 km S of Shelton, Washington
  6. 2.2 3 km NNE of Grand Mound, Washington
  7. 1.5 17 km NNW of Pe Ell, Washington
  8. 1.8 9 km W of Napavine, Washington
  9. 2.1 2 km ENE of Home, Washington
  10. 1.6 3 km SSW of Shelton, Washington
  11. 1.6 15 km N of Satsop, Washington
  12. 1.7 5 km SW of Napavine, Washington
  13. 1.7 9 km ENE of McCleary, Washington
  14. 1.6 7 km SSW of Shelton, Washington
  15. 1.6 2 km N of McCleary, 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.