QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

6 km N of Port Townsend, Washington

· 23 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 7 kmSan Juan County 45 kmKitsap County 60 kmJefferson County 71 kmSnohomish County 75 kmSkagit County 78 kmClallam County 84 kmMason County 97 kmWhatcom 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 3.0 (ml)
Depth
23 km below the surface
Felt
172 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Island County, 7 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3366 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 172 people have reported feeling it to USGS.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 48.1763, -122.7573. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 7 km (4 mi) WNW of here earthquakes near Island County
San Juan County, WA 45 km (28 mi) SE of here earthquakes near San Juan County
Kitsap County, WA 60 km (37 mi) N of here earthquakes near Kitsap County
Jefferson County, WA 71 km (44 mi) NE of here earthquakes near Jefferson County
Snohomish County, WA 75 km (47 mi) W of here earthquakes near Snohomish County
Skagit County, WA 78 km (48 mi) WSW of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 1.9 1 km WSW of Freeland, Washington
  2. 3.3 16 km NNE of Jamestown, Washington
  3. 1.6 6 km NE of Port Townsend, Washington
  4. 1.7 6 km NE of Port Townsend, Washington
  5. 1.6 3 km NW of Suquamish, Washington
  6. 1.6 6 km NE of Lofall, Washington
  7. 1.6 3 km SE of Warm Beach, Washington
  8. 1.6 5 km NNW of Ault Field, Washington
  9. 1.9 5 km SSW of Port Ludlow, Washington
  10. 1.7 4 km N of Weallup Lake, Washington
  11. 1.6 4 km W of Orcas, Washington
  12. 1.8 6 km NE of Port Townsend, Washington
  13. 1.5 1 km ENE of Bay View, Washington
  14. 1.7 1 km WNW of Bangor Trident Base, Washington
  15. 1.5 4 km NE of Marrowstone, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.