QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

36 km SSE of Morton, Washington

· 11 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skamania County 28 kmLewis County 43 kmCowlitz County 48 kmClark County 63 kmMultnomah County 84 kmColumbia County 86 kmPierce County 88 kmHood River County 89 kmThurston County 95 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
11 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Skamania County, 28 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3120 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 46.2607, -122.0632. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skamania County, WA 28 km (17 mi) NNW of here earthquakes near Skamania County
Lewis County, WA 43 km (27 mi) SE of here earthquakes near Lewis County
Cowlitz County, WA 48 km (30 mi) E of here earthquakes near Cowlitz County
Clark County, WA 63 km (39 mi) NNE of here earthquakes near Clark County
Multnomah County, OR 84 km (52 mi) NNE of here earthquakes near Multnomah County
Columbia County, OR 86 km (54 mi) ENE of here earthquakes near Columbia County

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

Aftershocks so far

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

  1. 2.9 Washington-Oregon border region
  2. 1.6 4 km NE of Amboy, Washington
  3. 1.6 14 km SSW of Morton, Washington
  4. 1.9 22 km SSE of Packwood, Washington
  5. 1.6 21 km SSE of Mossyrock, Washington
  6. 1.8 20 km NNW of Carson, Washington
  7. 1.6 4 km W of Mossyrock, Washington
  8. 1.6 6 km SSW of Morton, Washington
  9. 2.2 23 km S of Morton, Washington
  10. 1.8 23 km SSE of Mossyrock, Washington
  11. 1.8 24 km N of Amboy, Washington
  12. 1.8 23 km SSE of Mossyrock, Washington
  13. 1.8 23 km SSE of Mossyrock, Washington
  14. 1.8 12 km NNW of Amboy, Washington
  15. 1.6 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.