QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

2 km NNW of Quilcene, Washington

· 55 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 29 kmIsland County 39 kmJefferson County 48 kmMason County 58 kmSan Juan County 76 kmClallam County 80 kmSnohomish County 87 kmKing County 88 kmThurston County 100 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
55 km below the surface
Felt
163 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Kitsap County, 29 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 554 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 163 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 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 32,000× 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 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 47.8385, -122.8907. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 29 km (18 mi) NW of here earthquakes near Kitsap County
Island County, WA 39 km (24 mi) SSW of here earthquakes near Island County
Jefferson County, WA 48 km (30 mi) E of here earthquakes near Jefferson County
Mason County, WA 58 km (36 mi) NNE of here earthquakes near Mason County
San Juan County, WA 76 km (47 mi) SSE of here earthquakes near San Juan County
Clallam County, WA 80 km (50 mi) ESE of here earthquakes near Clallam 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. 1.9 7 km SSW of Clinton, Washington
  2. 1.9 5 km NW of Freeland, Washington
  3. 1.7 3 km SSW of Erlands Point-Kitsap Lake, Washington
  4. 1.6 2 km WNW of Navy Yard City, Washington
  5. 1.6 2 km WNW of Navy Yard City, Washington
  6. 1.9 1 km NE of Suquamish, Washington
  7. 1.6 2 km E of Enetai, Washington
  8. 2.7 5 km W of Gorst, Washington
  9. 1.5 3 km ENE of Enetai, Washington
  10. 1.6 2 km W of Coupeville, Washington
  11. 1.9 0 km SSE of Enetai, Washington
  12. 1.6 3 km NW of Burley, Washington
  13. 1.6 19 km WSW of Brinnon, Washington
  14. 1.5 3 km SSE of Quilcene, Washington
  15. 1.7 5 km ESE of Camano, 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 3.8 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.