QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

19 km SSW of Mossyrock, Washington

· -0.5 km deep · released about 7.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 21 kmLewis County 28 kmColumbia County 61 kmSkamania County 62 kmWahkiakum County 65 kmThurston County 65 kmClark County 67 kmPierce County 82 kmMultnomah County 93 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 21 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 564 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 7.3 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 7.3 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 46.3723, -122.5848. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 21 km (13 mi) NNE of here earthquakes near Cowlitz County
Lewis County, WA 28 km (17 mi) SW of here earthquakes near Lewis County
Columbia County, OR 61 km (38 mi) NE of here earthquakes near Columbia County
Skamania County, WA 62 km (39 mi) NW of here earthquakes near Skamania County
Wahkiakum County, WA 65 km (40 mi) E of here earthquakes near Wahkiakum County
Thurston County, WA 65 km (41 mi) SSE of here earthquakes near Thurston County

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

Aftershocks so far

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

  1. 1.6 18 km SSE of Mossyrock, Washington
  2. 1.7 11 km NNW of Morton, Washington
  3. 1.8 21 km SE of Toledo, Washington
  4. 2.2 4 km SE of Mossyrock, Washington
  5. 2.3 19 km E of Kelso, Washington
  6. 2.0 19 km E of Kelso, Washington
  7. 1.5 9 km ENE of Kalama, Washington
  8. 1.6 32 km S of Morton, Washington
  9. 1.6 20 km NE of Onalaska, Washington
  10. 1.6 5 km SW of Napavine, Washington
  11. 2.0 19 km SE of Toledo, Washington
  12. 1.7 6 km WSW of Napavine, Washington
  13. 1.9 6 km E of Mossyrock, Washington
  14. 1.5 20 km SSW of Morton, Washington
  15. 1.7 10 km SSE of Toledo, 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.