QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

20 km NE of Onalaska, Washington

· -0.2 km deep · released about 8.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 19 kmThurston County 33 kmPierce County 47 kmCowlitz County 59 kmWahkiakum County 83 kmMason County 85 kmSkamania County 89 kmColumbia County 96 kmPacific County 97 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Lewis County, 19 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 705 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 8.4 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 1,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.4 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 46.7165, -122.5365. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 19 km (12 mi) NW of here earthquakes near Lewis County
Thurston County, WA 33 km (21 mi) SE of here earthquakes near Thurston County
Pierce County, WA 47 km (29 mi) SW of here earthquakes near Pierce County
Cowlitz County, WA 59 km (37 mi) N of here earthquakes near Cowlitz County
Wahkiakum County, WA 83 km (51 mi) NE of here earthquakes near Wahkiakum County
Mason County, WA 85 km (53 mi) SE of here earthquakes near Mason 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. 1.6 6 km ESE of Mossyrock, Washington
  2. 1.7 13 km N of Onalaska, Washington
  3. 1.6 3 km W of Winlock, Washington
  4. 1.5 1 km WSW of Kapowsin, Washington
  5. 2.8 3 km NE of Mineral, Washington
  6. 1.9 6 km NE of Mossyrock, Washington
  7. 1.6 6 km ESE of Mossyrock, Washington
  8. 1.9 4 km WSW of Winlock, Washington
  9. 1.8 17 km WSW of Alder, Washington
  10. 1.6 1 km SSE of Kapowsin, Washington
  11. 1.7 8 km S of Mineral, Washington
  12. 1.8 1 km SE of Kapowsin, Washington
  13. 2.2 3 km NNE of Grand Mound, Washington
  14. 1.5 1 km SE of Kapowsin, Washington
  15. 1.8 9 km W 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

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