QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

12 km SSE of Cosmopolis, Washington

· -0.2 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grays Harbor County 30 kmPacific County 33 kmWahkiakum County 66 kmThurston County 69 kmMason County 69 kmClatsop County 92 kmLewis County 107 kmJefferson County 107 kmCowlitz County 108 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
Grays Harbor County, 30 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 479 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 46.8510, -123.7238. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grays Harbor County, WA 30 km (19 mi) SSE of here earthquakes near Grays Harbor County
Pacific County, WA 33 km (21 mi) N of here earthquakes near Pacific County
Wahkiakum County, WA 66 km (41 mi) NNW of here earthquakes near Wahkiakum County
Thurston County, WA 69 km (43 mi) W of here earthquakes near Thurston County
Mason County, WA 69 km (43 mi) SW of here earthquakes near Mason County
Clatsop County, OR 92 km (57 mi) N of here earthquakes near Clatsop County

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

Aftershocks so far

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

  1. 1.0 6 km SE of McCleary, Washington
  2. 1.4 20 km SW of Grayland, Washington
  3. 1.8 2 km WSW of Ocean City, Washington
  4. 1.7 1 km E of Oakville, Washington
  5. 1.7 14 km S of Cosmopolis, Washington
  6. 1.8 7 km NNW of Pe Ell, Washington
  7. 1.5 10 km NNE of Tokeland, Washington
  8. 2.2 12 km ENE of Humptulips, Washington
  9. 1.8 3 km WSW of South Bend, Washington
  10. 1.8 3 km S of Willapa, Washington
  11. 1.6 5 km WNW of Humptulips, Washington
  12. 2.6 5 km WSW of Pe Ell, Washington
  13. 1.5 2 km ESE of Humptulips, Washington
  14. 1.7 2 km N of Oakville, Washington
  15. 1.6 19 km E of Humptulips, 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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