QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

20 km E of Darrington, Washington

· 8.2 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 38 kmSkagit County 47 kmChelan County 67 kmWhatcom County 78 kmKing County 90 kmIsland County 100 kmKitsap County 118 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
8.2 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Snohomish County, 38 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 566 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 25 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 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 48.2282, -121.3280. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 38 km (23 mi) ENE of here earthquakes near Snohomish County
Skagit County, WA 47 km (29 mi) SE of here earthquakes near Skagit County
Chelan County, WA 67 km (41 mi) NW of here earthquakes near Chelan County
Whatcom County, WA 78 km (48 mi) SSE of here earthquakes near Whatcom County
King County, WA 90 km (56 mi) NNE of here earthquakes near King County
Island County, WA 100 km (62 mi) E of here earthquakes near Island County

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

Aftershocks so far

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

  1. 1.1 6 km NE of Oso, Washington
  2. 0.7 6 km SSE of Concrete, Washington
  3. 1.7 2 km NNE of May Creek, Washington
  4. 1.9 7 km SSE of Concrete, Washington
  5. 2.2 10 km NNE of Startup, Washington
  6. 1.7 1 km WNW of Marblemount, Washington
  7. 2.5 4 km WSW of Concrete, Washington
  8. 2.2 4 km WSW of Concrete, Washington
  9. 1.8 4 km WSW of Concrete, Washington
  10. 2.5 3 km WSW of Concrete, Washington
  11. 2.4 8 km N of North Sultan, Washington
  12. 1.7 4 km WSW of Concrete, Washington
  13. 2.9 4 km WSW of Concrete, Washington
  14. 2.6 4 km WSW of Concrete, Washington
  15. 1.5 4 km WSW of Concrete, 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.

On USGS

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