QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3 km NW of Friday Harbor, Washington

· 51 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 7 kmIsland County 53 kmClallam County 80 kmJefferson County 91 kmSkagit County 91 kmWhatcom County 95 kmKitsap County 106 kmSnohomish County 110 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 1.5 (ml)
Depth
51 km below the surface
Felt
no reports yet
Nearest
San Juan County, 7 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3500 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 48.5587, -123.0502. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 7 km (4 mi) NE of here earthquakes near San Juan County
Island County, WA 53 km (33 mi) NNW of here earthquakes near Island County
Clallam County, WA 80 km (49 mi) NE of here earthquakes near Clallam County
Jefferson County, WA 91 km (56 mi) NNE of here earthquakes near Jefferson County
Skagit County, WA 91 km (57 mi) W of here earthquakes near Skagit 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

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

  1. 1.6 1 km NNE of Six Mile, Canada
  2. 2.2 6 km NNE of Oak Bay, Canada
  3. 1.5 13 km WNW of Orcas, Washington
  4. 1.9 3 km S of Marietta, Washington
  5. 1.7 2 km SSE of Six Mile, Canada
  6. 1.8 22 km NW of Orcas, Washington
  7. 1.7 13 km W of Ault Field, Washington
  8. 2.9 7 km NW of La Conner, Washington
  9. 1.9 8 km NW of Friday Harbor, Washington
  10. 1.8 4 km S of Point Roberts, Washington
  11. 2.0 2 km S of Marietta, Washington
  12. 1.6 11 km NW of Friday Harbor, Washington
  13. 1.8 13 km S of Birch Bay, Washington
  14. 3.3 16 km NNE of Jamestown, Washington
  15. 1.8 0 km E of Six Mile, 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.