QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km WNW of Coupeville, Washington

· 57 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 12 kmSan Juan County 39 kmKitsap County 68 kmJefferson County 75 kmSkagit County 75 kmSnohomish County 77 kmClallam County 85 kmWhatcom County 95 kmMason County 104 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
57 km below the surface
Felt
no reports yet
Nearest
Island County, 12 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2117 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 48.2420, -122.7628. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 12 km (7 mi) NW of here earthquakes near Island County
San Juan County, WA 39 km (24 mi) SE of here earthquakes near San Juan County
Kitsap County, WA 68 km (42 mi) N of here earthquakes near Kitsap County
Jefferson County, WA 75 km (46 mi) NE of here earthquakes near Jefferson County
Skagit County, WA 75 km (47 mi) WSW of here earthquakes near Skagit County
Snohomish County, WA 77 km (48 mi) WNW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.7 1 km NNW of Silvana, Washington
  2. 1.7 12 km NNW of Quilcene, Washington
  3. 1.7 2 km S of River Road, Washington
  4. 2.4 12 km SSE of Friday Harbor, Washington
  5. 1.7 9 km WNW of Orcas, Washington
  6. 1.8 5 km N of Lofall, Washington
  7. 1.5 8 km WNW of Orcas, Washington
  8. 1.5 9 km WNW of Orcas, Washington
  9. 1.8 8 km WNW of Orcas, Washington
  10. 1.9 8 km ENE of Port Townsend, Washington
  11. 1.7 1 km SE of Mount Vernon, Washington
  12. 1.5 2 km W of Big Lake, Washington
  13. 1.6 3 km NNW of La Conner, Washington
  14. 2.4 8 km N of Anacortes, Washington
  15. 1.8 8 km WNW of Orcas, 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.