QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

5 km W of Coupeville, Washington

· 22 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 9 kmSan Juan County 41 kmKitsap County 65 kmJefferson County 73 kmSnohomish County 76 kmSkagit County 77 kmClallam County 84 kmWhatcom County 98 kmMason County 101 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
22 km below the surface
Felt
no reports yet
Nearest
Island County, 9 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 938 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 5.6 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 2,700,000× 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 5.6 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 48.2147, -122.7663. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 9 km (6 mi) NW of here earthquakes near Island County
San Juan County, WA 41 km (25 mi) SE of here earthquakes near San Juan County
Kitsap County, WA 65 km (40 mi) N of here earthquakes near Kitsap County
Jefferson County, WA 73 km (45 mi) NE of here earthquakes near Jefferson County
Snohomish County, WA 76 km (47 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 77 km (48 mi) WSW of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 2.4 4 km W of Mount Vernon, Washington
  2. 2.1 2 km S of River Road, Washington
  3. 1.5 5 km S of Port Ludlow, Washington
  4. 2.1 4 km WSW of Clinton, Washington
  5. 1.6 7 km NE of Quilcene, Washington
  6. 2.5 4 km ENE of Oak Bay, Canada
  7. 1.7 5 km W of Weallup Lake, Washington
  8. 1.9 5 km WSW of Stanwood, Washington
  9. 1.5 10 km E of Orcas, Washington
  10. 3.9 14 km SW of Blyn, Washington
  11. 4.5 2025 Orcas Island, Washington
  12. 3.7 16 km SSE of Victoria, Canada
  13. 1.8 17 km NNW of Jamestown, Washington
  14. 1.5 5 km ESE of Quilcene, Washington
  15. 1.8 4 km SSW of Port Ludlow, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2023-10-09 — it released about 16,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.