QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

24 km N of Winthrop, Washington

· 8.7 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Okanogan County 40 kmChelan County 97 kmDouglas County 114 kmSkagit County 119 kmWhatcom County 119 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 3.1 (ml)
Depth
8.7 km below the surface
Felt
32 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Okanogan County, 40 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 861 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 32 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 48.6980, -120.2310. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Okanogan County, WA 40 km (25 mi) WNW of here earthquakes near Okanogan County
Chelan County, WA 97 km (61 mi) NNE of here earthquakes near Chelan County
Douglas County, WA 114 km (71 mi) NNW of here earthquakes near Douglas County
Skagit County, WA 119 km (74 mi) ENE of here earthquakes near Skagit County
Whatcom County, WA 119 km (74 mi) E of here earthquakes near Whatcom County
Snohomish County, WA 134 km (83 mi) ENE of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.6 13 km WSW of Winthrop, Washington
  2. 1.9 24 km N of Winthrop, Washington
  3. 1.6 27 km NNW of Winthrop, Washington
  4. 1.6 26 km NNW of Winthrop, Washington
  5. 2.0 25 km NNW of Winthrop, Washington
  6. 1.6 29 km WSW of Oliver, Canada
  7. 1.7 56 km S of Princeton, Canada
  8. 1.7 54 km S of Princeton, Canada
  9. 2.6 14 km E of Winthrop, Washington
  10. 1.8 8 km SSW of Loomis, Washington
  11. 1.7 45 km NW of Winthrop, Washington
  12. 1.6 27 km NW of Conconully, Washington
  13. 1.6 13 km NW of Conconully, Washington
  14. 1.7 14 km NW of Conconully, Washington
  15. 1.9 43 km S of Princeton, Canada

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.