QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km NE of Anacortes, Washington

· 19 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 39 kmIsland County 44 kmSkagit County 56 kmWhatcom County 63 kmSnohomish County 81 kmKitsap County 101 kmJefferson County 109 kmClallam 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 1.8 (ml)
Depth
19 km below the surface
Felt
no reports yet
Nearest
San Juan County, 39 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2684 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 48.5493, -122.5737. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 39 km (24 mi) E of here earthquakes near San Juan County
Island County, WA 44 km (27 mi) N of here earthquakes near Island County
Skagit County, WA 56 km (35 mi) W of here earthquakes near Skagit County
Whatcom County, WA 63 km (39 mi) WSW of here earthquakes near Whatcom County
Snohomish County, WA 81 km (50 mi) NW of here earthquakes near Snohomish County
Kitsap County, WA 101 km (63 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

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

  1. 2.3 5 km N of Anacortes, Washington
  2. 2.5 5 km N of Anacortes, WA
  3. 1.6 7 km ESE of Nooksack, Washington
  4. 1.9 4 km W of Mount Vernon, Washington
  5. 1.9 6 km WSW of Mount Vernon, Washington
  6. 1.9 7 km NE of Marrowstone, Washington
  7. 2.5 9 km NW of Friday Harbor, Washington
  8. 1.6 13 km W of Coupeville, Washington
  9. 1.8 5 km N of Anacortes, Washington
  10. 2.0 5 km NNE of Anacortes, Washington
  11. 2.3 5 km N of Anacortes, Washington
  12. 1.7 4 km NE of Oak Harbor, Washington
  13. 2.3 6 km WSW of Kendall, Washington
  14. 1.7 4 km SW of Blaine, Washington
  15. 1.9 5 km SW of Blaine, 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.