QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km NE of Oak Harbor, Washington

· 28 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 16 kmSan Juan County 42 kmSkagit County 64 kmSnohomish County 70 kmKitsap County 73 kmWhatcom County 84 kmJefferson County 86 kmClallam County 96 kmKing County 108 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
28 km below the surface
Felt
no reports yet
Nearest
Island County, 16 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1810 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 48.2995, -122.6315. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 16 km (10 mi) N of here earthquakes near Island County
San Juan County, WA 42 km (26 mi) ESE of here earthquakes near San Juan County
Skagit County, WA 64 km (40 mi) WSW of here earthquakes near Skagit County
Snohomish County, WA 70 km (43 mi) WNW of here earthquakes near Snohomish County
Kitsap County, WA 73 km (46 mi) N of here earthquakes near Kitsap County
Whatcom County, WA 84 km (52 mi) SW of here earthquakes near Whatcom 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 4 km SSW of Port Ludlow, Washington
  2. 1.6 5 km SSW of Port Ludlow, Washington
  3. 1.6 9 km NW of Orcas, Washington
  4. 1.6 Puget Sound region, Washington
  5. 1.5 4 km SSW of Clinton, Washington
  6. 1.6 8 km NNW of Jamestown, Washington
  7. 1.7 4 km NE of La Conner, Washington
  8. 1.8 3 km NNW of Picnic Point, Washington
  9. 1.9 7 km SSW of Port Ludlow, Washington
  10. 1.5 16 km NE of Jamestown, Washington
  11. 1.5 2 km NW of Orcas, Washington
  12. 1.6 7 km WSW of Coupeville, Washington
  13. 1.6 5 km SW of Port Ludlow, Washington
  14. 2.3 6 km NW of Sedro-Woolley, Washington
  15. 2.0 6 km W 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.