QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

8 km NW of Tonasket, Washington

· 15 km deep · released about 1.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Okanogan County 30 kmFerry County 79 kmDouglas County 115 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 3.2 (ml)
Depth
15 km below the surface
Felt
56 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Okanogan County, 30 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 458 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 56 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 160,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,100× the energy of this one
  4. This earthquake M 3.2 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.2× 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 48.7678, -119.5143. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Okanogan County, WA 30 km (18 mi) NE of here earthquakes near Okanogan County
Ferry County, WA 79 km (49 mi) WNW of here earthquakes near Ferry County
Douglas County, WA 115 km (71 mi) N of here earthquakes near Douglas County
Chelan County, WA 130 km (81 mi) NE of here earthquakes near Chelan County

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

Aftershocks so far

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

  1. 2.2 8 km E of Loomis, Washington
  2. 1.6 8 km ESE of Loomis, Washington
  3. 1.6 9 km WNW of Okanogan, Washington
  4. 1.8 9 km ESE of Loomis, Washington
  5. 2.8 8 km ESE of Loomis, Washington
  6. 1.8 13 km NNW of Riverside, Washington
  7. 3.3 9 km ESE of Loomis, Washington
  8. 2.9 8 km E of Loomis, Washington
  9. 1.7 8 km ESE of Loomis, Washington
  10. 2.8 8 km E of Loomis, Washington
  11. 1.9 8 km ESE of Loomis, Washington
  12. 1.5 8 km ESE of Loomis, Washington
  13. 1.8 7 km ESE of Loomis, Washington
  14. 3.1 9 km NW of Tonasket, Washington
  15. 2.1 8 km ESE of Loomis, 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.