QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km ESE of McKenna, Washington

· 23 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Thurston County 25 kmPierce County 30 kmLewis County 39 kmMason County 70 kmKitsap County 81 kmKing County 81 kmCowlitz County 82 kmWahkiakum County 99 kmGrays Harbor County 103 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
23 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Thurston County, 25 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 271 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has 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 46.9223, -122.4998. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Thurston County, WA 25 km (16 mi) E of here earthquakes near Thurston County
Pierce County, WA 30 km (19 mi) WSW of here earthquakes near Pierce County
Lewis County, WA 39 km (24 mi) NNW of here earthquakes near Lewis County
Mason County, WA 70 km (43 mi) SE of here earthquakes near Mason County
Kitsap County, WA 81 km (50 mi) S of here earthquakes near Kitsap County
King County, WA 81 km (50 mi) SW of here earthquakes near King County

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

Aftershocks so far

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

  1. 1.1 3 km NNW of Dash Point, Washington
  2. 0.3 11 km SSE of Carbonado, Washington
  3. 0.3 18 km SSE of Carbonado, Washington
  4. 0.7 5 km SSW of Morton, Washington
  5. 2.1 3 km NNW of Kapowsin, Washington
  6. 1.0 4 km WSW of Mineral, Washington
  7. 1.3 14 km NNE of Ashford, Washington
  8. 1.2 12 km S of Rainier, Washington
  9. 1.1 5 km SW of Morton, Washington
  10. 1.5 5 km SSW of Morton, Washington
  11. 1.7 6 km W of Mossyrock, Washington
  12. 1.8 3 km SW of Kapowsin, Washington
  13. 1.9 6 km SSE of Lea Hill, Washington
  14. 1.5 0 km NNW of Eatonville, Washington
  15. 1.7 1 km SW of Kapowsin, 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.