QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

10 km NE of Union, Washington

· -0.2 km deep · released about 77 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mason County 15 kmKitsap County 36 kmThurston County 55 kmJefferson County 59 kmGrays Harbor County 71 kmPierce County 76 kmIsland County 86 kmKing County 88 kmClallam County 102 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 2.3 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
Mason County, 15 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3213 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 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 77 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 47.4157, -122.9995. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mason County, WA 15 km (9 mi) ENE of here earthquakes near Mason County
Kitsap County, WA 36 km (22 mi) SW of here earthquakes near Kitsap County
Thurston County, WA 55 km (34 mi) NNW of here earthquakes near Thurston County
Jefferson County, WA 59 km (36 mi) SE of here earthquakes near Jefferson County
Grays Harbor County, WA 71 km (44 mi) ENE of here earthquakes near Grays Harbor County
Pierce County, WA 76 km (47 mi) WNW of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 1.7 2 km SE of Manchester, Washington
  2. 1.9 1 km WNW of DuPont, Washington
  3. 2.3 1 km NNE of Enetai, Washington
  4. 2.8 8 km SW of Skokomish, Washington
  5. 1.7 8 km NNW of Olympia, Washington
  6. 1.8 7 km ESE of Quilcene, Washington
  7. 1.7 6 km W of Lofall, Washington
  8. 1.7 3 km E of Home, Washington
  9. 2.2 1 km SE of Bethel, Washington
  10. 2.1 4 km WSW of Seabeck, Washington
  11. 1.6 8 km S of Seabeck, Washington
  12. 1.7 3 km NE of Southworth, Washington
  13. 1.8 1 km WSW of Belfair, Washington
  14. 1.8 2 km SE of Manchester, Washington
  15. 1.7 2 km SSE of Manchester, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2017-02-23 — it released about 540 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.