QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

4 km NE of Mossyrock, Washington

· 15 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 5 kmCowlitz County 44 kmThurston County 52 kmPierce County 59 kmSkamania County 70 kmWahkiakum County 81 kmColumbia County 84 kmClark County 87 kmPacific 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 1.6 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Lewis County, 5 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1245 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 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 46.5550, -122.4377. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 5 km (3 mi) WSW of here earthquakes near Lewis County
Cowlitz County, WA 44 km (27 mi) NNE of here earthquakes near Cowlitz County
Thurston County, WA 52 km (32 mi) SE of here earthquakes near Thurston County
Pierce County, WA 59 km (37 mi) SSW of here earthquakes near Pierce County
Skamania County, WA 70 km (43 mi) NNW of here earthquakes near Skamania County
Wahkiakum County, WA 81 km (50 mi) ENE of here earthquakes near Wahkiakum County

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

Aftershocks so far

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

  1. 1.6 6 km ENE of Mossyrock, Washington
  2. 1.8 7 km SSE of McKenna, Washington
  3. 1.8 10 km NE of Castle Rock, Washington
  4. 1.6 2 km N of Onalaska, Washington
  5. 2.9 3 km N of Onalaska, Washington
  6. 2.4 10 km NNE of Ashford, Washington
  7. 1.8 4 km NW of Winlock, Washington
  8. 1.6 27 km S of Morton, Washington
  9. 2.5 27 km S of Morton, Washington
  10. 2.4 14 km SW of Alder, Washington
  11. 1.6 5 km WSW of La Grande, Washington
  12. 1.5 8 km E of Ashford, Washington
  13. 2.0 5 km WSW of Napavine, Washington
  14. 1.6 10 km SSE of Toledo, Washington
  15. 1.8 34 km NNE of Amboy, 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.