QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9ml

37 km SSE of Morton, Washington

· 10 km deep · released about 9.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skamania County 27 kmLewis County 44 kmCowlitz County 48 kmClark County 63 kmMultnomah County 84 kmColumbia County 86 kmHood River County 88 kmPierce County 89 kmThurston County 96 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 3.9 (ml)
Depth
10 km below the surface
Felt
223 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Skamania County, 27 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3110 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 223 people have reported feeling it to USGS.

How big was it?

This earthquake released about 9.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 18,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 790× the energy of this one
  3. Magna, Utah 2020 M 5.7 560× the energy of this one
  4. This earthquake M 3.9 about 9.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 20× 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 46.2557, -122.0563. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skamania County, WA 27 km (17 mi) NNW of here earthquakes near Skamania County
Lewis County, WA 44 km (27 mi) SE of here earthquakes near Lewis County
Cowlitz County, WA 48 km (30 mi) E of here earthquakes near Cowlitz County
Clark County, WA 63 km (39 mi) NNE of here earthquakes near Clark County
Multnomah County, OR 84 km (52 mi) NNE of here earthquakes near Multnomah County
Columbia County, OR 86 km (54 mi) ENE of here earthquakes near Columbia County

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

Aftershocks so far

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

  1. 1.6 6 km SSW of Morton, Washington
  2. 2.2 23 km S of Morton, Washington
  3. 1.8 23 km SSE of Mossyrock, Washington
  4. 1.8 24 km N of Amboy, Washington
  5. 1.8 23 km SSE of Mossyrock, Washington
  6. 1.8 23 km SSE of Mossyrock, Washington
  7. 1.8 12 km NNW of Amboy, Washington
  8. 1.6 Washington
  9. 1.7 8 km S of Morton, Washington
  10. 2.1 Washington
  11. 1.7 23 km NNE of Amboy, Washington
  12. 1.6 24 km NNW of Carson, Washington
  13. 1.8 12 km SE of Mossyrock, Washington
  14. 1.5 25 km S of Mossyrock, Washington
  15. 1.7 24 km NNW of Carson, 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.