QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

13 km N of Onalaska, Washington

· -0.2 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Thurston County 28 kmLewis County 30 kmCowlitz County 56 kmPierce County 59 kmWahkiakum County 69 kmMason County 80 kmPacific County 81 kmColumbia County 88 kmGrays Harbor 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 1.7 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
Thurston County, 28 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 339 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 10 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 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 46.6963, -122.7375. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Thurston County, WA 28 km (17 mi) SSE of here earthquakes near Thurston County
Lewis County, WA 30 km (19 mi) WNW of here earthquakes near Lewis County
Cowlitz County, WA 56 km (35 mi) N of here earthquakes near Cowlitz County
Pierce County, WA 59 km (37 mi) SW of here earthquakes near Pierce County
Wahkiakum County, WA 69 km (43 mi) NE of here earthquakes near Wahkiakum County
Mason County, WA 80 km (50 mi) SSE of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.0 6 km SE of McCleary, Washington
  2. 0.7 5 km SSW of Morton, Washington
  3. 1.0 4 km WSW of Mineral, Washington
  4. 1.2 12 km S of Rainier, Washington
  5. 1.1 5 km SW of Morton, Washington
  6. 1.5 5 km SSW of Morton, Washington
  7. 1.7 6 km W of Mossyrock, Washington
  8. 1.8 3 km SW of Kapowsin, Washington
  9. 1.6 6 km NE of Rochester, Washington
  10. 1.5 0 km NNW of Eatonville, Washington
  11. 1.7 1 km SW of Kapowsin, Washington
  12. 1.6 9 km S of Mossyrock, Washington
  13. 1.5 6 km NW of Winlock, Washington
  14. 1.7 1 km E of Oakville, Washington
  15. 1.6 5 km W of Tumwater, 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.