QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

20 km S of Morton, Washington

· 14 km deep · released about 2.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 23 kmCowlitz County 34 kmSkamania County 49 kmClark County 69 kmThurston County 73 kmColumbia County 76 kmPierce County 76 kmWahkiakum County 85 kmMultnomah County 93 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 3.5 (ml)
Depth
14 km below the surface
Felt
271 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Lewis County, 23 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 737 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 271 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 68,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,100× the energy of this one
  4. This earthquake M 3.5 about 2.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.2× 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 46.3797, -122.3262. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 23 km (14 mi) S of here earthquakes near Lewis County
Cowlitz County, WA 34 km (21 mi) NE of here earthquakes near Cowlitz County
Skamania County, WA 49 km (30 mi) NW of here earthquakes near Skamania County
Clark County, WA 69 km (43 mi) N of here earthquakes near Clark County
Thurston County, WA 73 km (45 mi) SSE of here earthquakes near Thurston County
Columbia County, OR 76 km (47 mi) NE of here earthquakes near Columbia 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. 1.7 12 km SSW of Alder, Washington
  2. 1.6 6 km ESE of Mossyrock, Washington
  3. 1.7 13 km N of Onalaska, Washington
  4. 2.3 38 km SSE of Morton, Washington
  5. 1.7 18 km E of West Side Highway, Washington
  6. 1.6 19 km NE of Kalama, Washington
  7. 1.6 21 km ENE of Kalama, Washington
  8. 1.5 27 km NNW of Amboy, Washington
  9. 2.8 3 km NE of Mineral, Washington
  10. 1.9 6 km NE of Mossyrock, Washington
  11. 1.6 6 km ESE of Mossyrock, Washington
  12. 1.8 17 km WSW of Alder, Washington
  13. 1.6 31 km N of Amboy, Washington
  14. 1.7 8 km S of Mineral, Washington
  15. 1.6 12 km NNE of Amboy, 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.