QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

6 km W of Mossyrock, Washington

· -0.7 km deep · released about 9.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 16 kmCowlitz County 37 kmThurston County 51 kmPierce County 67 kmWahkiakum County 71 kmSkamania County 72 kmColumbia County 76 kmClark County 83 kmPacific 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 1.7 (ml)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Lewis County, 16 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 11 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 9.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 96× the energy of this one
  4. This earthquake M 1.7 about 9.9 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 46.5192, -122.5635. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 16 km (10 mi) WSW of here earthquakes near Lewis County
Cowlitz County, WA 37 km (23 mi) NNE of here earthquakes near Cowlitz County
Thurston County, WA 51 km (31 mi) SSE of here earthquakes near Thurston County
Pierce County, WA 67 km (42 mi) SSW of here earthquakes near Pierce County
Wahkiakum County, WA 71 km (44 mi) ENE of here earthquakes near Wahkiakum County
Skamania County, WA 72 km (45 mi) NW of here earthquakes near Skamania County

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

Aftershocks so far

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

  1. 1.3 20 km E of Castle Rock, Washington
  2. 0.2 37 km NNE of Amboy, Washington
  3. 0.5 38 km NNE of Amboy, Washington
  4. 0.7 5 km SSW of Morton, Washington
  5. 1.0 4 km WSW of Mineral, Washington
  6. 0.6 38 km NNE of Amboy, Washington
  7. 1.2 12 km S of Rainier, Washington
  8. 0.7 21 km ESE of Castle Rock, Washington
  9. 1.1 5 km SW of Morton, Washington
  10. 1.5 5 km SSW of Morton, Washington
  11. 1.3 38 km NNE of Amboy, Washington
  12. 1.0 32 km NNE of Amboy, Washington
  13. 0.9 20 km E of Castle Rock, Washington
  14. 0.6 21 km ESE of Castle Rock, Washington
  15. 0.0 38 km NE 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.