QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

23 km SSE of Mossyrock, Washington

· 13 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 27 kmLewis County 28 kmSkamania County 48 kmClark County 63 kmColumbia County 68 kmThurston County 75 kmWahkiakum County 79 kmPierce County 82 kmMultnomah County 87 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
13 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 27 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2391 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 46.3312, -122.3930. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 27 km (16 mi) NE of here earthquakes near Cowlitz County
Lewis County, WA 28 km (17 mi) S of here earthquakes near Lewis County
Skamania County, WA 48 km (30 mi) NW of here earthquakes near Skamania County
Clark County, WA 63 km (39 mi) N of here earthquakes near Clark County
Columbia County, OR 68 km (43 mi) NE of here earthquakes near Columbia County
Thurston County, WA 75 km (47 mi) SSE of here earthquakes near Thurston County

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

Aftershocks so far

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

  1. 1.8 20 km SSW of Morton, Washington
  2. 1.7 16 km NNE of Amboy, Washington
  3. 1.7 26 km N of Amboy, Washington
  4. 1.6 18 km SSE of Mossyrock, Washington
  5. 1.8 19 km WSW of Alder, Washington
  6. 1.8 1 km ENE of Prescott, Oregon
  7. 1.6 5 km ESE of Mossyrock, Washington
  8. 1.7 21 km E of Castle Rock, Washington
  9. 1.6 10 km SSE of Toledo, Washington
  10. 1.6 21 km E of Castle Rock, Washington
  11. 2.1 9 km NNE of Mossyrock, Washington
  12. 1.7 21 km E of Castle Rock, Washington
  13. 2.1 29 km E of Castle Rock, Washington
  14. 1.6 21 km E of Castle Rock, Washington
  15. 1.9 10 km SSE of Toledo, 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.