QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

7 km WNW of Lofall, Washington

· 23 km deep · released about 5.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 24 kmIsland County 36 kmJefferson County 58 kmMason County 63 kmSnohomish County 77 kmSan Juan County 78 kmKing County 79 kmClallam County 90 kmPierce 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 3.7 (ml)
Depth
23 km below the surface
Felt
3428 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Kitsap County, 24 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 284 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3428 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 31,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 970× the energy of this one
  4. This earthquake M 3.7 about 5.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 12× 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 47.8420, -122.7517. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 24 km (15 mi) NNW of here earthquakes near Kitsap County
Island County, WA 36 km (22 mi) S of here earthquakes near Island County
Jefferson County, WA 58 km (36 mi) E of here earthquakes near Jefferson County
Mason County, WA 63 km (39 mi) NNE of here earthquakes near Mason County
Snohomish County, WA 77 km (48 mi) WSW of here earthquakes near Snohomish County
San Juan County, WA 78 km (49 mi) SSE of here earthquakes near San Juan County

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

Aftershocks so far

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

  1. 1.6 3 km W of Belfair, Washington
  2. 1.6 3 km SSE of Quilcene, Washington
  3. 1.7 5 km SW of Port Ludlow, Washington
  4. 2.0 3 km N of White Center, Washington
  5. 1.6 3 km NW of Wauna, Washington
  6. 1.7 1 km NNW of River Road, Washington
  7. 2.3 6 km WSW of Shoreline, Washington
  8. 1.6 4 km W of Bainbridge Island, Washington
  9. 1.6 2 km NE of Esperance, Washington
  10. 1.6 3 km SSE of Quilcene, Washington
  11. 1.7 4 km NNW of White Center, Washington
  12. 1.7 2 km SSW of Gorst, Washington
  13. 1.5 5 km SW of Port Ludlow, Washington
  14. 1.9 2 km SSW of Esperance, Washington
  15. 1.8 1 km W of Suquamish, 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 3.7 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.