QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11 km SSW of Darrington, Washington

· 1.6 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 14 kmSkagit County 38 kmIsland County 74 kmWhatcom County 76 kmKing County 76 kmChelan County 86 kmKitsap County 93 kmSan Juan County 112 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 1.8 (ml)
Depth
1.6 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 14 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2295 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 48.1667, -121.6762. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 14 km (9 mi) NNE of here earthquakes near Snohomish County
Skagit County, WA 38 km (23 mi) SSE of here earthquakes near Skagit County
Island County, WA 74 km (46 mi) E of here earthquakes near Island County
Whatcom County, WA 76 km (47 mi) S of here earthquakes near Whatcom County
King County, WA 76 km (47 mi) N of here earthquakes near King County
Chelan County, WA 86 km (53 mi) WNW of here earthquakes near Chelan 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. 1.6 1 km WNW of Lake Cavanaugh, Washington
  2. 1.6 2 km ENE of Granite Falls, Washington
  3. 1.7 5 km NNE of Oso, Washington
  4. 2.2 6 km NE of Oso, Washington
  5. 1.7 3 km ENE of Granite Falls, Washington
  6. 1.8 5 km SW of Lake Cavanaugh, Washington
  7. 2.2 8 km NE of Oso, Washington
  8. 1.9 2 km SSW of Hamilton, Washington
  9. 2.1 4 km SSW of Hamilton, Washington
  10. 2.2 5 km E of Big Lake, Washington
  11. 1.7 6 km ENE of Lake Roesiger, Washington
  12. 1.7 1 km NNE of Woods Creek, Washington
  13. 1.9 13 km S of May Creek, Washington
  14. 2.0 4 km ESE of Swede Heaven, Washington
  15. 1.9 5 km NW of North Sultan, 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 14,000 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.