QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

8 km SE of Friday Harbor, Washington

· 49 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 13 kmIsland County 40 kmClallam County 81 kmSkagit County 83 kmJefferson County 86 kmWhatcom County 91 kmKitsap County 95 kmSnohomish County 99 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 2.5 (ml)
Depth
49 km below the surface
Felt
14 reports · strongest reported intensity III
Nearest
San Juan County, 13 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2720 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 14 people have reported feeling it to USGS.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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 48.4755, -122.9392. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 13 km (8 mi) ESE of here earthquakes near San Juan County
Island County, WA 40 km (25 mi) NNW of here earthquakes near Island County
Clallam County, WA 81 km (50 mi) ENE of here earthquakes near Clallam County
Skagit County, WA 83 km (51 mi) W of here earthquakes near Skagit County
Jefferson County, WA 86 km (54 mi) NNE of here earthquakes near Jefferson County
Whatcom County, WA 91 km (56 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

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

  1. 2.5 Washington-British Columbia border region
  2. 2.0 9 km S of Friday Harbor, Washington
  3. 1.5 12 km ENE of North Saanich, Canada
  4. 3.0 10 km NW of Friday Harbor, Washington
  5. 2.6 3 km NNE of Coupeville, Washington
  6. 1.6 6 km E of Oak Bay, Canada
  7. 2.3 11 km NNE of Six Mile, Canada
  8. 2.1 13 km N of Orcas, Washington
  9. 2.6 0 km SSW of Oak Harbor, Washington
  10. 1.6 4 km ENE of Oak Harbor, Washington
  11. 1.7 3 km NNE of Six Mile, Canada
  12. 2.0 9 km NW of Friday Harbor, Washington
  13. 3.0 1 km WSW of Bell Hill, Washington
  14. 1.7 11 km WNW of Ault Field, Washington
  15. 1.5 3 km WNW of North Saanich, Canada

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.