QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

13 km WNW of Granite Falls, Washington

· -0.3 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chelan County 19 kmDouglas County 55 kmOkanogan County 84 kmKittitas County 92 kmSnohomish County 104 kmGrant County 105 kmKing 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 1.8 (ml)
Depth
-0.3 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Chelan County, 19 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. 2 people have reported feeling it to USGS.

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 47.9238, -120.3847. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chelan County, WA 19 km (12 mi) ENE of here earthquakes near Chelan County
Douglas County, WA 55 km (34 mi) WNW of here earthquakes near Douglas County
Okanogan County, WA 84 km (52 mi) SW of here earthquakes near Okanogan County
Kittitas County, WA 92 km (57 mi) NNE of here earthquakes near Kittitas County
Snohomish County, WA 104 km (64 mi) E of here earthquakes near Snohomish County
Grant County, WA 105 km (65 mi) NW of here earthquakes near Grant County

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

Aftershocks so far

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

  1. 0.9 5 km ENE of Entiat, Washington
  2. 2.3 4 km NW of Waterville, Washington
  3. 1.7 7 km WSW of Chelan, Washington
  4. 1.6 12 km W of Entiat, Washington
  5. 1.9 10 km SSW of Granite Falls, Washington
  6. 1.7 23 km NW of Granite Falls, Washington
  7. 1.5 7 km SSE of Chelan Falls, Washington
  8. 1.6 13 km E of Waterville, Washington
  9. 1.8 7 km W of Entiat, Washington
  10. 2.5 4 km NW of Waterville, Washington
  11. 1.6 15 km WSW of Methow, Washington
  12. 2.4 5 km SSW of Chelan Falls, Washington
  13. 1.8 2 km NNE of Entiat, Washington
  14. 2.6 10 km WNW of Entiat, Washington
  15. 1.7 7 km W of Entiat, 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.