QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

19 km NE of Packwood, Washington

· 4.7 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 59 kmYakima County 67 kmLewis County 68 kmKittitas County 76 kmKing County 86 kmSkamania County 87 kmThurston County 102 kmCowlitz County 108 kmKlickitat County 112 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
4.7 km below the surface
Felt
15 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Pierce County, 59 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 868 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 15 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 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 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 46.7445, -121.5163. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 59 km (37 mi) SE of here earthquakes near Pierce County
Yakima County, WA 67 km (42 mi) WNW of here earthquakes near Yakima County
Lewis County, WA 68 km (42 mi) ENE of here earthquakes near Lewis County
Kittitas County, WA 76 km (48 mi) WSW of here earthquakes near Kittitas County
King County, WA 86 km (54 mi) SSE of here earthquakes near King County
Skamania County, WA 87 km (54 mi) NNE of here earthquakes near Skamania County

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

Aftershocks so far

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

  1. 1.7 23 km ENE of Ashford, Washington
  2. 2.0 22 km ENE of Ashford, Washington
  3. 1.6 23 km ENE of Ashford, Washington
  4. 1.7 17 km NE of Ashford, Washington
  5. 2.3 23 km ENE of Ashford, Washington
  6. 1.6 23 km ENE of Ashford, Washington
  7. 1.6 22 km ENE of Ashford, Washington
  8. 2.3 22 km ENE of Ashford, Washington
  9. 1.6 22 km ENE of Ashford, Washington
  10. 1.6 22 km ENE of Ashford, Washington
  11. 1.5 23 km ENE of Ashford, Washington
  12. 1.6 23 km ENE of Ashford, Washington
  13. 2.0 23 km NNE of Packwood, Washington
  14. 1.6 12 km E of Greenwater, Washington
  15. 1.8 14 km SW of Packwood, 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.