QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9 km SE of Mossyrock, Washington

· 16 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 13 kmCowlitz County 37 kmSkamania County 60 kmThurston County 62 kmPierce County 68 kmClark County 78 kmColumbia County 79 kmWahkiakum County 81 kmMultnomah County 102 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 1.8 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Lewis County, 13 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3194 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 46.4673, -122.3983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 13 km (8 mi) S of here earthquakes near Lewis County
Cowlitz County, WA 37 km (23 mi) NE of here earthquakes near Cowlitz County
Skamania County, WA 60 km (37 mi) NW of here earthquakes near Skamania County
Thurston County, WA 62 km (38 mi) SSE of here earthquakes near Thurston County
Pierce County, WA 68 km (42 mi) SSW of here earthquakes near Pierce County
Clark County, WA 78 km (48 mi) N of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.6 20 km NE of Kalama, Washington
  2. 1.7 8 km S of Morton, Washington
  3. 2.1 Washington
  4. 1.7 23 km NNE of Amboy, Washington
  5. 1.8 18 km ESE of Castle Rock, Washington
  6. 1.8 12 km SE of Mossyrock, Washington
  7. 1.5 25 km S of Mossyrock, Washington
  8. 1.7 9 km SE of Mossyrock, Washington
  9. 1.6 6 km SW of La Grande, Washington
  10. 2.0 4 km E of West Side Highway, Washington
  11. 1.9 13 km NNE of Mossyrock, Washington
  12. 1.7 8 km NE of Castle Rock, Washington
  13. 1.5 6 km SE of Mossyrock, Washington
  14. 1.8 9 km NNE of Castle Rock, Washington
  15. 1.9 37 km SSE of Morton, 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.