QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

12 km SE of Mossyrock, Washington

· 8.6 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 16 kmCowlitz County 35 kmSkamania County 57 kmThurston County 65 kmPierce County 70 kmClark County 75 kmColumbia County 77 kmWahkiakum County 81 kmMultnomah County 99 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
8.6 km below the surface
Felt
no reports yet
Nearest
Lewis County, 16 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2571 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 46.4393, -122.3922. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 16 km (10 mi) S of here earthquakes near Lewis County
Cowlitz County, WA 35 km (22 mi) NE of here earthquakes near Cowlitz County
Skamania County, WA 57 km (36 mi) NW of here earthquakes near Skamania County
Thurston County, WA 65 km (40 mi) SSE of here earthquakes near Thurston County
Pierce County, WA 70 km (44 mi) SSW of here earthquakes near Pierce County
Clark County, WA 75 km (46 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

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

  1. 1.6 5 km ESE of Mossyrock, Washington
  2. 1.7 21 km E of Castle Rock, Washington
  3. 1.6 10 km SSE of Toledo, Washington
  4. 1.6 21 km E of Castle Rock, Washington
  5. 2.1 9 km NNE of Mossyrock, Washington
  6. 1.7 21 km E of Castle Rock, Washington
  7. 2.1 29 km E of Castle Rock, Washington
  8. 1.6 6 km NNW of Ashford, Washington
  9. 1.6 21 km E of Castle Rock, Washington
  10. 1.9 10 km SSE of Toledo, Washington
  11. 1.7 20 km SE of Toledo, Washington
  12. 1.9 23 km NE of Amboy, Washington
  13. 2.2 37 km SSE of Morton, Washington
  14. 1.6 14 km SE of Mossyrock, Washington
  15. 1.6 15 km ESE 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.