QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

2 km SSE of Stanwood, Washington

· 17 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 24 kmSnohomish County 48 kmSkagit County 50 kmSan Juan County 63 kmKitsap County 69 kmWhatcom County 79 kmKing County 91 kmJefferson County 99 kmClallam 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 3.4 (ml)
Depth
17 km below the surface
Felt
493 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Island County, 24 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 88 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 493 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 92,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,900× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.8× more

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 48.2248, -122.3595. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 24 km (15 mi) ENE of here earthquakes near Island County
Snohomish County, WA 48 km (30 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 63 km (39 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 69 km (43 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. 1.9 3 km W of Mount Vernon, Washington
  2. 2.0 9 km W of Coupeville, Washington
  3. 1.8 4 km NNW of Port Townsend, Washington
  4. 1.6 4 km SW of Port Ludlow, Washington
  5. 1.5 11 km WNW of Ault Field, Washington
  6. 1.5 1 km ESE of Three Lakes, Washington
  7. 2.0 0 km WSW of Lynnwood, Washington
  8. 1.7 3 km N of Woods Creek, Washington
  9. 1.7 4 km E of Lake Bosworth, Washington
  10. 1.6 2 km N of Edmonds, Washington
  11. 1.6 2 km ENE of Granite Falls, Washington
  12. 2.0 1 km SE of Coupeville, Washington
  13. 1.6 4 km N of Woods Creek, Washington
  14. 1.6 6 km SSW of Port Ludlow, Washington
  15. 1.9 6 km S of Acme, 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 61 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.