QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7 km NNW of Friday Harbor, Washington

· 15 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 10 kmIsland County 57 kmClallam County 81 kmSkagit County 93 kmJefferson County 94 kmWhatcom County 95 kmKitsap County 110 kmSnohomish County 114 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 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
San Juan County, 10 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2732 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 48.5922, -123.0737. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 10 km (6 mi) NNE of here earthquakes near San Juan County
Island County, WA 57 km (35 mi) NNW of here earthquakes near Island County
Clallam County, WA 81 km (50 mi) NE of here earthquakes near Clallam County
Skagit County, WA 93 km (58 mi) W of here earthquakes near Skagit County
Jefferson County, WA 94 km (58 mi) NNE of here earthquakes near Jefferson County
Whatcom County, WA 95 km (59 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

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

  1. 1.7 4 km WNW of North Saanich, Canada
  2. 1.7 4 km SW of Blaine, Washington
  3. 1.9 5 km SW of Blaine, Washington
  4. 1.5 2 km NNW of Birch Bay, Washington
  5. 1.6 8 km WNW of Orcas, Washington
  6. 2.2 7 km NNW of Victoria, Canada
  7. 2.1 19 km NNW of Jamestown, Washington
  8. 2.3 12 km WNW of Edison, Washington
  9. 1.7 10 km W of Friday Harbor, Washington
  10. 1.8 9 km NW of Friday Harbor, Washington
  11. 1.9 4 km SSE of Colwood, Canada
  12. 1.6 10 km WNW of Orcas, Washington
  13. 1.6 5 km WSW of Coupeville, Washington
  14. 2.4 11 km W of Ault Field, Washington
  15. 2.5 Washington-British Columbia border region

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.