QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

8 km NNE of Hamilton, Washington

· 0.9 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 15 kmWhatcom County 29 kmSnohomish County 62 kmIsland County 72 kmSan Juan County 86 kmKitsap County 118 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 2.9 (ml)
Depth
0.9 km below the surface
Felt
29 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Skagit County, 15 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1786 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 29 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 48.5952, -121.9495. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 15 km (9 mi) NW of here earthquakes near Skagit County
Whatcom County, WA 29 km (18 mi) SSW of here earthquakes near Whatcom County
Snohomish County, WA 62 km (38 mi) NNW of here earthquakes near Snohomish County
Island County, WA 72 km (45 mi) NE of here earthquakes near Island County
San Juan County, WA 86 km (53 mi) E of here earthquakes near San Juan County
Kitsap County, WA 118 km (73 mi) NNE of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 2.0 14 km NE of Lake Cavanaugh, Washington
  2. 2.3 15 km NE of Lake Cavanaugh, Washington
  3. 1.6 6 km WSW of Darrington, Washington
  4. 1.6 4 km NNE of Oso, Washington
  5. 1.6 9 km NNE of Sedro-Woolley, Washington
  6. 1.8 4 km NNW of Bryant, Washington
  7. 1.6 14 km NNE of Hamilton, Washington
  8. 1.8 2 km SW of Deming, Washington
  9. 1.9 4 km ENE of La Conner, Washington
  10. 1.6 7 km SSE of Concrete, Washington
  11. 1.6 Washington
  12. 1.5 4 km NW of Glacier, Washington
  13. 1.9 5 km S of Acme, Washington
  14. 1.7 Washington
  15. 1.7 4 km NE of La Conner, 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.