QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3 km SSE of Stanwood, Washington

· 19 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 25 kmSnohomish County 47 kmSkagit County 50 kmSan Juan County 64 kmKitsap County 68 kmWhatcom County 79 kmKing County 89 kmJefferson County 99 kmMason 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 1.5 (ml)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Island County, 25 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1014 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 48.2170, -122.3480. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 25 km (15 mi) ENE of here earthquakes near Island County
Snohomish County, WA 47 km (29 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 50 km (31 mi) SW of here earthquakes near Skagit County
San Juan County, WA 64 km (40 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 68 km (42 mi) NNE of here earthquakes near Kitsap County
Whatcom County, WA 79 km (49 mi) SSW of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.7 5 km WSW of Clinton, Washington
  2. 1.6 5 km N of Port Townsend, Washington
  3. 1.8 6 km WSW of Port Hadlock-Irondale, Washington
  4. 1.7 2 km E of Granite Falls, Washington
  5. 1.8 4 km SSW of Port Ludlow, Washington
  6. 1.8 5 km NE of Kingston, Washington
  7. 1.9 3 km W of Mount Vernon, Washington
  8. 2.0 9 km W of Coupeville, Washington
  9. 1.8 4 km NNW of Port Townsend, Washington
  10. 1.6 4 km SW of Port Ludlow, Washington
  11. 1.5 2 km W of Woods Creek, Washington
  12. 1.5 11 km WNW of Ault Field, Washington
  13. 1.5 1 km ESE of Three Lakes, Washington
  14. 2.0 0 km WSW of Lynnwood, Washington
  15. 1.7 3 km N of Woods Creek, 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 4.6 on 2019-07-12 — it released about 39,000 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.