QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

20 km SSW of Morton, Washington

· 14 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 23 kmCowlitz County 33 kmSkamania County 49 kmClark County 68 kmThurston County 73 kmColumbia County 75 kmPierce County 76 kmWahkiakum County 84 kmMultnomah County 92 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 1.5 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Lewis County, 23 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 770 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 46.3772, -122.3313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 23 km (14 mi) S of here earthquakes near Lewis County
Cowlitz County, WA 33 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 68 km (42 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 75 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. 1.5 4 km ESE of Mossyrock, Washington
  2. 1.8 7 km ESE of Mossyrock, Washington
  3. 1.9 5 km ESE of Mossyrock, Washington
  4. 1.8 5 km ESE of Mossyrock, Washington
  5. 1.7 12 km SSW of Alder, Washington
  6. 1.6 6 km ESE of Mossyrock, Washington
  7. 1.7 13 km N of Onalaska, Washington
  8. 2.3 38 km SSE of Morton, Washington
  9. 1.7 18 km E of West Side Highway, Washington
  10. 1.6 19 km NE of Kalama, Washington
  11. 1.6 21 km ENE of Kalama, Washington
  12. 1.5 27 km NNW of Amboy, Washington
  13. 2.8 3 km NE of Mineral, Washington
  14. 1.9 6 km NE of Mossyrock, Washington
  15. 1.6 6 km ESE of Mossyrock, 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.