QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km SSE of McKenna, Washington

· 20 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Thurston County 24 kmLewis County 34 kmPierce County 35 kmMason County 73 kmCowlitz County 75 kmKitsap County 86 kmKing County 87 kmWahkiakum County 94 kmPacific County 102 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
20 km below the surface
Felt
no reports yet
Nearest
Thurston County, 24 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 898 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 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 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× 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 46.8663, -122.5262. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Thurston County, WA 24 km (15 mi) ESE of here earthquakes near Thurston County
Lewis County, WA 34 km (21 mi) NNW of here earthquakes near Lewis County
Pierce County, WA 35 km (22 mi) SW of here earthquakes near Pierce County
Mason County, WA 73 km (45 mi) SE of here earthquakes near Mason County
Cowlitz County, WA 75 km (47 mi) N of here earthquakes near Cowlitz County
Kitsap County, WA 86 km (54 mi) S of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 1.5 1 km SE of Kapowsin, Washington
  2. 1.8 9 km W of Napavine, Washington
  3. 2.1 2 km ENE of Home, Washington
  4. 1.7 11 km WSW of Mineral, Washington
  5. 1.6 2 km WSW of Kapowsin, Washington
  6. 1.6 12 km WSW of Alder, Washington
  7. 2.1 9 km S of Morton, Washington
  8. 2.7 7 km ESE of Mossyrock, Washington
  9. 1.7 2 km SSW of Kapowsin, Washington
  10. 2.6 9 km S of Morton, Washington
  11. 1.6 2 km S of Kapowsin, Washington
  12. 1.8 1 km S of Kapowsin, Washington
  13. 1.7 5 km SW of Napavine, Washington
  14. 2.2 11 km WSW of Mineral, Washington
  15. 1.9 2 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.