QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11 km N of Packwood, Washington

· 5.2 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 52 kmLewis County 56 kmYakima County 77 kmSkamania County 80 kmKing County 87 kmKittitas County 88 kmThurston County 91 kmCowlitz County 96 kmKlickitat County 116 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
5.2 km below the surface
Felt
no reports yet
Nearest
Pierce County, 52 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 555 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 46.7137, -121.6740. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 52 km (33 mi) SE of here earthquakes near Pierce County
Lewis County, WA 56 km (35 mi) ENE of here earthquakes near Lewis County
Yakima County, WA 77 km (48 mi) WNW of here earthquakes near Yakima County
Skamania County, WA 80 km (49 mi) NNE of here earthquakes near Skamania County
King County, WA 87 km (54 mi) S of here earthquakes near King County
Kittitas County, WA 88 km (55 mi) WSW of here earthquakes near Kittitas County

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

Aftershocks so far

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

  1. 1.5 22 km ENE of Ashford, Washington
  2. 2.0 22 km ENE of Ashford, Washington
  3. 2.0 22 km ENE of Ashford, Washington
  4. 2.0 22 km ENE of Ashford, Washington
  5. 1.5 17 km NE of Ashford, Washington
  6. 2.5 19 km NNE of Ashford, Washington
  7. 1.6 15 km ESE of Morton, Washington
  8. 1.6 15 km N of Ashford, Washington
  9. 1.6 6 km NE of Ashford, Washington
  10. 1.6 29 km ESE of Packwood, Washington
  11. 1.6 6 km ESE of Ashford, Washington
  12. 2.0 21 km ESE of Packwood, Washington
  13. 1.5 22 km ENE of Ashford, Washington
  14. 1.9 22 km SSE of Packwood, Washington
  15. 1.8 23 km ENE of Ashford, 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.