QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8ml

20 km E of Castle Rock, Washington

· 18 km deep · released about 6.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 6 kmLewis County 42 kmColumbia County 48 kmClark County 54 kmSkamania County 59 kmWahkiakum County 60 kmThurston County 78 kmMultnomah County 80 kmWashington County 85 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 3.8 (ml)
Depth
18 km below the surface
Felt
1025 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Cowlitz County, 6 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1025 people have reported feeling it to USGS.

How big was it?

This earthquake released about 6.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 27,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 840× the energy of this one
  4. This earthquake M 3.8 about 6.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 13× 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 46.2465, -122.6420. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 6 km (4 mi) NNE of here earthquakes near Cowlitz County
Lewis County, WA 42 km (26 mi) SSW of here earthquakes near Lewis County
Columbia County, OR 48 km (30 mi) NE of here earthquakes near Columbia County
Clark County, WA 54 km (34 mi) NNW of here earthquakes near Clark County
Skamania County, WA 59 km (36 mi) WNW of here earthquakes near Skamania County
Wahkiakum County, WA 60 km (38 mi) E of here earthquakes near Wahkiakum County

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

Aftershocks so far

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

  1. 1.3 20 km E of Castle Rock, Washington
  2. 0.2 37 km NNE of Amboy, Washington
  3. 0.5 38 km NNE of Amboy, Washington
  4. 1.5 5 km NNW of Venersborg, Washington
  5. 0.7 5 km SSW of Morton, Washington
  6. 0.6 38 km NNE of Amboy, Washington
  7. 1.7 18 km N of Amboy, Washington
  8. 0.3 32 km NE of Amboy, Washington
  9. 0.7 21 km ESE of Castle Rock, Washington
  10. 1.1 5 km SW of Morton, Washington
  11. 1.5 5 km SSW of Morton, Washington
  12. 1.3 38 km NNE of Amboy, Washington
  13. 1.0 32 km NNE of Amboy, Washington
  14. 0.9 20 km E of Castle Rock, Washington
  15. 0.6 21 km ESE of Castle Rock, 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.