QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

8 km SSE of Coupeville, Washington

· 28 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 2 kmSan Juan County 52 kmKitsap County 57 kmSnohomish County 66 kmSkagit County 72 kmJefferson County 76 kmClallam County 93 kmKing County 95 kmWhatcom County 97 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
28 km below the surface
Felt
no reports yet
Nearest
Island County, 2 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2719 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 48.1500, -122.6397. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 2 km (2 mi) ESE of here earthquakes near Island County
San Juan County, WA 52 km (33 mi) SE of here earthquakes near San Juan County
Kitsap County, WA 57 km (35 mi) N of here earthquakes near Kitsap County
Snohomish County, WA 66 km (41 mi) W of here earthquakes near Snohomish County
Skagit County, WA 72 km (45 mi) WSW of here earthquakes near Skagit County
Jefferson County, WA 76 km (47 mi) ENE of here earthquakes near Jefferson 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. 1.8 5 km N of Anacortes, Washington
  2. 2.0 5 km NNE of Anacortes, Washington
  3. 2.3 5 km N of Anacortes, Washington
  4. 1.7 4 km NE of Oak Harbor, Washington
  5. 1.8 2 km WSW of Shoreline, Washington
  6. 2.1 19 km NNW of Jamestown, Washington
  7. 2.4 5 km E of Quilcene, Washington
  8. 1.7 2 km NNW of Indianola, Washington
  9. 1.6 5 km WSW of Coupeville, Washington
  10. 2.5 3 km SW of Woodway, Washington
  11. 2.4 11 km W of Ault Field, Washington
  12. 1.9 6 km ENE of Marrowstone, Washington
  13. 2.0 9 km S of Friday Harbor, Washington
  14. 1.7 2 km NE of Port Ludlow, Washington
  15. 2.0 6 km SSE of Quilcene, 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.