QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

4 km W of Mossyrock, Washington

· -0.8 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 14 kmCowlitz County 38 kmThurston County 51 kmPierce County 66 kmSkamania County 72 kmWahkiakum County 72 kmColumbia County 77 kmClark County 84 kmPacific County 95 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
-0.8 km below the surface
Felt
no reports yet
Nearest
Lewis County, 14 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2307 days ago

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

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 7.1 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 46.5227, -122.5450. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 14 km (9 mi) WSW of here earthquakes near Lewis County
Cowlitz County, WA 38 km (23 mi) NNE of here earthquakes near Cowlitz County
Thurston County, WA 51 km (32 mi) SSE of here earthquakes near Thurston County
Pierce County, WA 66 km (41 mi) SSW of here earthquakes near Pierce County
Skamania County, WA 72 km (45 mi) NW of here earthquakes near Skamania County
Wahkiakum County, WA 72 km (45 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

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

  1. 1.9 14 km WSW of Alder, Washington
  2. 2.1 8 km SSW of Morton, Washington
  3. 2.0 21 km E of Castle Rock, Washington
  4. 1.6 31 km S of Morton, Washington
  5. 1.7 3 km W of Winlock, Washington
  6. 1.5 4 km ESE of Chehalis, Washington
  7. 2.0 37 km NNE of Amboy, Washington
  8. 2.8 21 km E of Castle Rock, Washington
  9. 1.5 21 km E of Castle Rock, Washington
  10. 1.6 6 km WSW of La Grande, Washington
  11. 2.5 21 km E of Castle Rock, Washington
  12. 2.4 9 km SE of Mossyrock, Washington
  13. 1.6 37 km NNE of Amboy, Washington
  14. 1.5 28 km N of Amboy, Washington
  15. 1.6 6 km WSW of Napavine, 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.