QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

28 km N of Amboy, Washington

· 20 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 16 kmSkamania County 43 kmClark County 44 kmLewis County 46 kmColumbia County 53 kmMultnomah County 69 kmWahkiakum County 75 kmWashington County 84 kmThurston County 90 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
20 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 16 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1704 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 5.6 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 2,700,000× 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 5.6 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 46.1683, -122.4712. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 16 km (10 mi) E of here earthquakes near Cowlitz County
Skamania County, WA 43 km (27 mi) WNW of here earthquakes near Skamania County
Clark County, WA 44 km (27 mi) N of here earthquakes near Clark County
Lewis County, WA 46 km (29 mi) S of here earthquakes near Lewis County
Columbia County, OR 53 km (33 mi) ENE of here earthquakes near Columbia County
Multnomah County, OR 69 km (43 mi) N of here earthquakes near Multnomah County

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

Aftershocks so far

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

  1. 1.7 3 km E of Prescott, Oregon
  2. 1.6 3 km WSW of Yacolt, Washington
  3. 2.0 6 km NNW of Mossyrock, Washington
  4. 1.5 9 km SSE of Toledo, Washington
  5. 1.8 3 km WNW of Saint Helens, Oregon
  6. 1.8 9 km NE of Castle Rock, Washington
  7. 1.7 4 km WSW of Yacolt, Washington
  8. 2.4 Washington
  9. 1.8 11 km SSE of Toledo, Washington
  10. 1.5 26 km S of Morton, Washington
  11. 2.4 30 km ENE of Amboy, Washington
  12. 2.4 29 km ENE of Amboy, Washington
  13. 1.6 31 km NNE of Amboy, Washington
  14. 1.8 7 km WSW of Morton, Washington
  15. 2.7 7 km WSW 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.