QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

41 km NW of Granite Falls, Washington

· -0.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chelan County 29 kmOkanogan County 83 kmSnohomish County 83 kmDouglas County 83 kmSkagit County 95 kmKittitas County 111 kmKing County 112 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 1.8 (ml)
Depth
-0.7 km below the surface
Felt
2 reports · strongest reported intensity I
Nearest
Chelan County, 29 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1728 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 48.1188, -120.6542. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chelan County, WA 29 km (18 mi) N of here earthquakes near Chelan County
Okanogan County, WA 83 km (51 mi) SW of here earthquakes near Okanogan County
Snohomish County, WA 83 km (51 mi) E of here earthquakes near Snohomish County
Douglas County, WA 83 km (51 mi) WNW of here earthquakes near Douglas County
Skagit County, WA 95 km (59 mi) ESE of here earthquakes near Skagit County
Kittitas County, WA 111 km (69 mi) N of here earthquakes near Kittitas County

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

Aftershocks so far

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

  1. 1.6 13 km WSW of Winthrop, Washington
  2. 1.9 10 km SSW of Granite Falls, Washington
  3. 1.7 23 km NW of Granite Falls, Washington
  4. 1.6 15 km WSW of Methow, Washington
  5. 2.6 10 km WNW of Entiat, Washington
  6. 1.7 44 km WSW of Twisp, Washington
  7. 1.6 10 km NW of Entiat, Washington
  8. 1.8 44 km WSW of Twisp, Washington
  9. 1.6 26 km NNW of Leavenworth, Washington
  10. 1.9 25 km NW of Leavenworth, Washington
  11. 2.2 24 km NW of Leavenworth, Washington
  12. 2.6 26 km NW of Leavenworth, Washington
  13. 1.8 13 km WNW of Granite Falls, Washington
  14. 1.7 46 km WSW of Twisp, Washington
  15. 1.6 52 km SE of Marblemount, 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.