QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

17 km WSW of Brinnon, Washington

· 50 km deep · released about 2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mason County 28 kmKitsap County 34 kmJefferson County 40 kmIsland County 70 kmThurston County 76 kmGrays Harbor County 77 kmClallam County 83 kmPierce County 93 kmKing 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 3.4 (ml)
Depth
50 km below the surface
Felt
127 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Mason County, 28 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 834 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 127 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× 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 47.5928, -123.0920. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mason County, WA 28 km (17 mi) NNE of here earthquakes near Mason County
Kitsap County, WA 34 km (21 mi) W of here earthquakes near Kitsap County
Jefferson County, WA 40 km (25 mi) SE of here earthquakes near Jefferson County
Island County, WA 70 km (44 mi) SSW of here earthquakes near Island County
Thurston County, WA 76 km (47 mi) NNW of here earthquakes near Thurston County
Grays Harbor County, WA 77 km (48 mi) NE of here earthquakes near Grays Harbor County

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

Aftershocks so far

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

  1. 1.9 6 km SSW of River Road, Washington
  2. 1.7 2 km N of Enetai, Washington
  3. 1.7 2 km E of Tracyton, Washington
  4. 1.5 16 km SW of Brinnon, Washington
  5. 2.3 7 km ESE of Quilcene, Washington
  6. 2.2 7 km E of Quilcene, Washington
  7. 1.5 6 km WNW of Lofall, Washington
  8. 1.6 6 km WSW of Shelton, Washington
  9. 1.7 7 km WSW of Quilcene, Washington
  10. 1.8 4 km SSW of Port Ludlow, Washington
  11. 2.3 3 km WNW of Navy Yard City, Washington
  12. 1.6 7 km ESE of Quilcene, Washington
  13. 1.9 4 km WNW of Gorst, Washington
  14. 1.9 2 km E of Belfair, Washington
  15. 1.7 8 km SSW of Seabeck, 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 10 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.