QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

8 km NNE of Sedro-Woolley, Washington

· 8.5 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 29 kmWhatcom County 40 kmIsland County 58 kmSnohomish County 65 kmSan Juan County 68 kmKitsap County 109 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 1.6 (ml)
Depth
8.5 km below the surface
Felt
no reports yet
Nearest
Skagit County, 29 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 336 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 48.5700, -122.1882. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 29 km (18 mi) WNW of here earthquakes near Skagit County
Whatcom County, WA 40 km (25 mi) SW of here earthquakes near Whatcom County
Island County, WA 58 km (36 mi) NE of here earthquakes near Island County
Snohomish County, WA 65 km (41 mi) NNW of here earthquakes near Snohomish County
San Juan County, WA 68 km (42 mi) E of here earthquakes near San Juan County
Kitsap County, WA 109 km (68 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

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

  1. 2.6 2 km ENE of Mount Vernon, Washington
  2. 1.8 15 km ESE of Acme, Washington
  3. 1.6 2 km ESE of Oak Harbor, Washington
  4. 1.9 7 km SSE of Concrete, Washington
  5. 1.9 2 km NNE of Lyman, Washington
  6. 1.8 8 km N of Maple Falls, Washington
  7. 1.6 2 km E of Oak Harbor, Washington
  8. 2.1 3 km E of Oak Harbor, Washington
  9. 1.7 3 km E of Oak Harbor, Washington
  10. 1.7 3 km N of Lyman, Washington
  11. 2.2 2 km N of Lyman, Washington
  12. 2.1 3 km ESE of Oak Harbor, Washington
  13. 1.6 5 km N of Anacortes, Washington
  14. 2.1 3 km E of Oak Harbor, Washington
  15. 1.8 5 km E of Acme, 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.