QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

12 km NNW of Amboy, Washington

· 13 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 24 kmClark County 26 kmSkamania County 43 kmColumbia County 45 kmMultnomah County 52 kmLewis County 64 kmWashington County 68 kmWahkiakum County 77 kmHood River 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, 24 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2414 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 46.0092, -122.5133. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 24 km (15 mi) SSE of here earthquakes near Cowlitz County
Clark County, WA 26 km (16 mi) N of here earthquakes near Clark County
Skamania County, WA 43 km (27 mi) W of here earthquakes near Skamania County
Columbia County, OR 45 km (28 mi) E of here earthquakes near Columbia County
Multnomah County, OR 52 km (32 mi) N of here earthquakes near Multnomah County
Lewis County, WA 64 km (40 mi) S of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 1.7 3 km NNE of Deer Island, Oregon
  2. 1.6 4 km NW of West Longview, Washington
  3. 1.8 1 km ENE of Prescott, Oregon
  4. 1.5 5 km ENE of Lewisville, Washington
  5. 1.7 21 km E of Castle Rock, Washington
  6. 1.6 10 km SSE of Toledo, Washington
  7. 1.6 21 km E of Castle Rock, Washington
  8. 1.7 21 km E of Castle Rock, Washington
  9. 2.1 29 km E of Castle Rock, Washington
  10. 1.6 21 km E of Castle Rock, Washington
  11. 1.8 2 km S of Saint Helens, Oregon
  12. 1.9 10 km SSE of Toledo, Washington
  13. 1.6 5 km E of Lewisville, Washington
  14. 1.7 20 km SE of Toledo, Washington
  15. 1.7 1 km SSE of Prescott, Oregon

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.