QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km WNW of Wauna, Washington

· 25 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 27 kmMason County 36 kmThurston County 52 kmPierce County 57 kmKing County 66 kmJefferson County 77 kmIsland County 85 kmGrays Harbor County 91 kmLewis County 94 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 1.8 (ml)
Depth
25 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Kitsap County, 27 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3330 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 47.3983, -122.7023. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 27 km (17 mi) S of here earthquakes near Kitsap County
Mason County, WA 36 km (22 mi) E of here earthquakes near Mason County
Thurston County, WA 52 km (33 mi) N of here earthquakes near Thurston County
Pierce County, WA 57 km (35 mi) NW of here earthquakes near Pierce County
King County, WA 66 km (41 mi) W of here earthquakes near King County
Jefferson County, WA 77 km (48 mi) SE of here earthquakes near Jefferson 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. 2.2 5 km S of Seabeck, Washington
  2. 1.9 6 km WSW of Chico, Washington
  3. 1.6 12 km SSE of Shelton, Washington
  4. 1.6 2 km N of Seattle, Washington
  5. 1.5 7 km ENE of Allyn, Washington
  6. 1.6 1 km W of Enetai, Washington
  7. 1.7 6 km W of Burley, Washington
  8. 2.7 4 km WSW of Mercer Island, Washington
  9. 2.3 6 km W of Burley, Washington
  10. 1.8 1 km SSW of Esperance, Washington
  11. 1.7 2 km N of Mercer Island, Washington
  12. 2.5 0 km S of Esperance, Washington
  13. 1.5 4 km SSE of Vashon, Washington
  14. 1.7 3 km SSW of Erlands Point-Kitsap Lake, Washington
  15. 1.6 2 km WNW of Navy Yard City, 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 2,700 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.