QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

16 km E of Humptulips, Washington

· -0.3 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grays Harbor County 16 kmMason County 44 kmJefferson County 64 kmPacific County 77 kmThurston County 77 kmKitsap County 93 kmClallam County 97 kmWahkiakum 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
-0.3 km below the surface
Felt
no reports yet
Nearest
Grays Harbor County, 16 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 612 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 9.6 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 1,600,000× 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 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 47.2455, -123.7392. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grays Harbor County, WA 16 km (10 mi) NNE of here earthquakes near Grays Harbor County
Mason County, WA 44 km (28 mi) WSW of here earthquakes near Mason County
Jefferson County, WA 64 km (40 mi) SSW of here earthquakes near Jefferson County
Pacific County, WA 77 km (48 mi) N of here earthquakes near Pacific County
Thurston County, WA 77 km (48 mi) WNW of here earthquakes near Thurston County
Kitsap County, WA 93 km (58 mi) WSW of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 1.0 6 km SE of McCleary, Washington
  2. 1.8 2 km WSW of Ocean City, Washington
  3. 1.7 35 km NE of Amanda Park, Washington
  4. 1.7 14 km S of Cosmopolis, Washington
  5. 1.7 12 km NNW of Humptulips, Washington
  6. 2.2 12 km ENE of Humptulips, Washington
  7. 1.6 16 km WNW of Skokomish, Washington
  8. 1.6 5 km WNW of Humptulips, Washington
  9. 1.5 2 km ESE of Humptulips, Washington
  10. 1.6 9 km NE of Humptulips, Washington
  11. 1.7 12 km NE of Santiago, Washington
  12. 1.6 19 km E of Humptulips, Washington
  13. 2.0 9 km NE of Santiago, Washington
  14. 2.8 21 km NW of Hoodsport, Washington
  15. 1.9 12 km SSE of Cosmopolis, 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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