QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

5 km WSW of Stanwood, Washington

· 28 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 18 kmSnohomish County 53 kmSkagit County 55 kmSan Juan County 59 kmKitsap County 66 kmWhatcom County 82 kmKing County 93 kmJefferson County 93 kmClallam County 108 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 1.9 (ml)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Island County, 18 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 48.2178, -122.4385. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 18 km (11 mi) ENE of here earthquakes near Island County
Snohomish County, WA 53 km (33 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 55 km (34 mi) WSW of here earthquakes near Skagit County
San Juan County, WA 59 km (37 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 66 km (41 mi) NNE of here earthquakes near Kitsap County
Whatcom County, WA 82 km (51 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

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

  1. 1.7 3 km NNW of Warm Beach, Washington
  2. 1.9 4 km SSW of Port Ludlow, Washington
  3. 1.6 4 km W of Mount Vernon, Washington
  4. 2.2 3 km SW of Port Ludlow, Washington
  5. 1.5 1 km NE of Esperance, Washington
  6. 1.7 4 km W of Mount Vernon, Washington
  7. 1.7 2 km ENE of Granite Falls, Washington
  8. 1.6 8 km NNE of Sedro-Woolley, Washington
  9. 1.7 1 km E of Granite Falls, Washington
  10. 2.1 6 km WNW of Coupeville, Washington
  11. 2.9 7 km ENE of Marrowstone, Washington
  12. 1.8 2 km ESE of Mount Vernon, Washington
  13. 2.4 2 km ESE of Mount Vernon, Washington
  14. 2.2 2 km SE of Mount Vernon, Washington
  15. 2.9 2 km ESE of Mount Vernon, 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 11,000 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.