QuakeIndex

explosion · reviewed by a seismologist

M 2.1ml

10 km WSW of Chehalis, Washington

· -0.9 km deep · released about 38 lb of TNT

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10 km30 km60 km120 km N Thurston County 39 kmWahkiakum County 46 kmPacific County 53 kmLewis County 55 kmCowlitz County 59 kmGrays Harbor County 77 kmColumbia County 78 kmMason County 79 kmClatsop County 83 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 2.1 (ml)
Depth
-0.9 km below the surface
Felt
no reports yet
Nearest
Thurston County, 39 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2147 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 46.6392, -123.0952. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Thurston County, WA 39 km (24 mi) SSW of here earthquakes near Thurston County
Wahkiakum County, WA 46 km (28 mi) NNE of here earthquakes near Wahkiakum County
Pacific County, WA 53 km (33 mi) E of here earthquakes near Pacific County
Lewis County, WA 55 km (34 mi) W of here earthquakes near Lewis County
Cowlitz County, WA 59 km (36 mi) NNW of here earthquakes near Cowlitz County
Grays Harbor County, WA 77 km (48 mi) SE of here earthquakes near Grays Harbor County

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

Aftershocks so far

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

  1. 2.0 5 km WSW of Napavine, Washington
  2. 1.6 10 km SSE of Toledo, Washington
  3. 1.5 1 km NNW of Oakville, Washington
  4. 1.7 6 km S of Onalaska, Washington
  5. 1.6 10 km NW of West Longview, Washington
  6. 1.6 8 km WSW of Tumwater, Washington
  7. 1.6 2 km E of Oakville, Washington
  8. 1.5 10 km ESE of Centralia, Washington
  9. 1.6 19 km SSW of Mossyrock, Washington
  10. 1.8 4 km NNW of West Longview, Washington
  11. 1.7 2 km N of Oakville, Washington
  12. 1.7 Washington-Oregon border region
  13. 1.5 10 km SSE of Toledo, Washington
  14. 1.7 10 km NE of Castle Rock, Washington
  15. 1.5 11 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.