QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

13 km WNW of Ault Field, Washington

· 52 km deep · released about 2.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 23 kmIsland County 29 kmSkagit County 76 kmJefferson County 83 kmClallam County 84 kmKitsap County 85 kmSnohomish County 88 kmWhatcom County 89 kmMason County 119 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 3.5 (ml)
Depth
52 km below the surface
Felt
100 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
San Juan County, 23 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3466 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 100 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 75,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,400× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.7× 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 48.3977, -122.8368. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 23 km (14 mi) ESE of here earthquakes near San Juan County
Island County, WA 29 km (18 mi) NNW of here earthquakes near Island County
Skagit County, WA 76 km (47 mi) W of here earthquakes near Skagit County
Jefferson County, WA 83 km (52 mi) NE of here earthquakes near Jefferson County
Clallam County, WA 84 km (52 mi) ENE of here earthquakes near Clallam County
Kitsap County, WA 85 km (53 mi) N of here earthquakes near Kitsap 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. 1.6 9 km NNE of Jamestown, Washington
  2. 1.7 2 km ESE of Conway, Washington
  3. 2.0 4 km N of Anacortes, Washington
  4. 1.8 6 km SSE of Victoria, Canada
  5. 3.1 2 km SW of Marietta, Washington
  6. 2.2 5 km N of Carlsborg, Washington
  7. 1.8 0 km SW of Marietta-Alderwood, Washington
  8. 1.7 4 km NW of Bay View, Washington
  9. 3.0 6 km N of Port Townsend, Washington
  10. 2.6 6 km NNW of Friday Harbor, Washington
  11. 1.5 3 km NW of Friday Harbor, Washington
  12. 2.2 8 km NNW of Friday Harbor, Washington
  13. 2.1 10 km NW of Friday Harbor, Washington
  14. 2.1 10 km NNW of Friday Harbor, Washington
  15. 1.5 9 km NNW of Friday Harbor, 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.