QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km NW of Friday Harbor, Washington

· 11 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 11 kmIsland County 59 kmClallam County 81 kmJefferson County 95 kmSkagit County 95 kmWhatcom County 96 kmKitsap County 112 kmSnohomish County 116 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
11 km below the surface
Felt
no reports yet
Nearest
San Juan County, 11 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 625 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 48.6048, -123.0915. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 11 km (7 mi) N of here earthquakes near San Juan County
Island County, WA 59 km (36 mi) NNW of here earthquakes near Island County
Clallam County, WA 81 km (50 mi) NE of here earthquakes near Clallam County
Jefferson County, WA 95 km (59 mi) NNE of here earthquakes near Jefferson County
Skagit County, WA 95 km (59 mi) W of here earthquakes near Skagit County
Whatcom County, WA 96 km (60 mi) WSW of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.8 5 km SE of Oak Bay, Canada
  2. 1.8 5 km SW of Custer, Washington
  3. 1.7 2 km NE of Six Mile, Canada
  4. 2.1 4 km WSW of Ault Field, Washington
  5. 2.1 7 km NW of Jamestown, Washington
  6. 1.5 8 km WNW of Orcas, Washington
  7. 2.5 4 km ENE of Oak Bay, Canada
  8. 1.5 10 km E of Orcas, Washington
  9. 4.5 2025 Orcas Island, Washington
  10. 2.3 1 km NNE of Esquimalt, Canada
  11. 3.7 16 km SSE of Victoria, Canada
  12. 1.8 17 km NNW of Jamestown, Washington
  13. 1.5 11 km NNW of Orcas, Washington
  14. 1.8 2 km W of Point Roberts, Washington
  15. 2.1 3 km W of Point Roberts, 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.