QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

6 km E of Copalis Beach, Washington

· 34 km deep · released about 1.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Grays Harbor County 19 kmPacific County 66 kmMason County 74 kmJefferson County 88 kmThurston County 97 kmWahkiakum County 104 kmClallam County 112 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 3.4 (ml)
Depth
34 km below the surface
Felt
39 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Grays Harbor County, 19 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2603 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 39 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× more

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 47.1138, -124.0837. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Grays Harbor County, WA 19 km (12 mi) W of here earthquakes near Grays Harbor County
Pacific County, WA 66 km (41 mi) NNW of here earthquakes near Pacific County
Mason County, WA 74 km (46 mi) WSW of here earthquakes near Mason County
Jefferson County, WA 88 km (54 mi) SSW of here earthquakes near Jefferson County
Thurston County, WA 97 km (60 mi) WNW of here earthquakes near Thurston County
Wahkiakum County, WA 104 km (65 mi) NNW of here earthquakes near Wahkiakum County

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

Aftershocks so far

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

  1. 2.1 7 km ENE of Santiago, Washington
  2. 2.0 14 km SSE of Cosmopolis, Washington
  3. 1.7 12 km SSE of Cosmopolis, Washington
  4. 1.6 24 km ESE of Neilton, Washington
  5. 1.8 5 km WSW of Aberdeen Gardens, Washington
  6. 1.6 2 km ENE of Humptulips, Washington
  7. 2.1 14 km W of Neilton, Washington
  8. 1.7 8 km WNW of Taholah, Washington
  9. 1.8 11 km ENE of Copalis Beach, Washington
  10. 1.5 8 km SSW of Cosmopolis, Washington
  11. 2.2 2 km NW of Markham, Washington
  12. 2.4 6 km SSW of Neilton, Washington
  13. 1.7 16 km E of Humptulips, Washington
  14. 2.7 7 km NNW of Montesano, Washington
  15. 1.6 1 km NNE 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.