QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

Puget Sound region, Washington

· 29 km deep · released about 1,100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 26 kmMason County 36 kmThurston County 53 kmPierce County 57 kmKing County 66 kmJefferson County 76 kmIsland County 84 kmGrays Harbor County 91 kmLewis County 95 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 3.1 (ml)
Depth
29 km below the surface
Felt
214 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Kitsap County, 26 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 859 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 214 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 300,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,400× the energy of this one
  4. This earthquake M 3.1 about 1,100 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× more

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 47.4075, -122.6972. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 26 km (16 mi) S of here earthquakes near Kitsap County
Mason County, WA 36 km (23 mi) E of here earthquakes near Mason County
Thurston County, WA 53 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 76 km (47 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

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

  1. 1.9 3 km SE of Fife, Washington
  2. 1.8 3 km S of Southworth, Washington
  3. 2.6 6 km NW of Belfair, Washington
  4. 1.7 1 km NE of White Center, Washington
  5. 1.8 1 km E of Enetai, Washington
  6. 2.2 3 km SW of Redmond, Washington
  7. 1.7 2 km NW of Manchester, Washington
  8. 1.6 6 km SSW of Shelton, Washington
  9. 2.5 4 km WSW of Artondale, Washington
  10. 2.0 6 km WNW of Lofall, Washington
  11. 1.7 10 km S of Seabeck, Washington
  12. 2.6 7 km WNW of Lofall, Washington
  13. 2.3 0 km ESE of Waller, Washington
  14. 1.9 6 km ENE of Lofall, Washington
  15. 2.2 8 km ENE of Quilcene, 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 36 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.