QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

18 km N of Amboy, Washington

· 8.3 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 20 kmClark County 34 kmSkamania County 41 kmColumbia County 49 kmLewis County 56 kmMultnomah County 59 kmWashington County 75 kmWahkiakum County 76 kmHood River 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 2.1 (ml)
Depth
8.3 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 20 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 202 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 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 46.0785, -122.4835. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 20 km (12 mi) SE of here earthquakes near Cowlitz County
Clark County, WA 34 km (21 mi) N of here earthquakes near Clark County
Skamania County, WA 41 km (26 mi) W of here earthquakes near Skamania County
Columbia County, OR 49 km (30 mi) ENE of here earthquakes near Columbia County
Lewis County, WA 56 km (35 mi) S of here earthquakes near Lewis County
Multnomah County, OR 59 km (37 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. 1.5 5 km NNW of Venersborg, Washington
  2. 0.7 5 km SSW of Morton, Washington
  3. 0.6 38 km NNE of Amboy, Washington
  4. 1.7 18 km N of Amboy, Washington
  5. 0.3 32 km NE of Amboy, Washington
  6. 0.7 21 km ESE of Castle Rock, Washington
  7. 1.3 38 km NNE of Amboy, Washington
  8. 1.0 32 km NNE of Amboy, Washington
  9. 0.9 20 km E of Castle Rock, Washington
  10. 0.6 21 km ESE of Castle Rock, Washington
  11. 0.0 38 km NE of Amboy, Washington
  12. 1.5 37 km NNE of Amboy, Washington
  13. 1.5 31 km E of Kelso, Washington
  14. 2.2 27 km ENE of Yacolt, Washington
  15. 1.6 5 km WSW of Yacolt, 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.