QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

4 km NE of Amboy, Washington

· 9.4 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 19 kmCowlitz County 36 kmSkamania County 36 kmMultnomah County 43 kmColumbia County 52 kmWashington County 69 kmLewis County 72 kmHood River County 75 kmClackamas County 88 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 1.6 (ml)
Depth
9.4 km below the surface
Felt
no reports yet
Nearest
Clark County, 19 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2148 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 45.9363, -122.4023. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 19 km (12 mi) NNE of here earthquakes near Clark County
Cowlitz County, WA 36 km (22 mi) SE of here earthquakes near Cowlitz County
Skamania County, WA 36 km (22 mi) WSW of here earthquakes near Skamania County
Multnomah County, OR 43 km (27 mi) N of here earthquakes near Multnomah County
Columbia County, OR 52 km (33 mi) E of here earthquakes near Columbia County
Washington County, OR 69 km (43 mi) NE of here earthquakes near Washington County

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

Aftershocks so far

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

  1. 1.6 3 km W of Yacolt, Washington
  2. 1.6 2 km WNW of Saint Helens, Oregon
  3. 2.1 1 km WNW of Deer Island, Oregon
  4. 1.7 1 km SW of Columbia City, Oregon
  5. 1.7 1 km NNE of Battle Ground, Washington
  6. 1.8 2 km E of Saint Helens, Oregon
  7. 1.5 2 km WSW of Yacolt, Washington
  8. 1.5 7 km ENE of Prescott, Oregon
  9. 2.0 4 km SE of Mill Plain, Washington
  10. 2.1 11 km ENE of Prescott, Oregon
  11. 1.6 4 km NNW of Lewisville, Washington
  12. 2.6 3 km SE of Mill Plain, Washington
  13. 1.6 15 km E of Castle Rock, Washington
  14. 1.7 1 km WSW of Kalama, Washington
  15. 2.0 21 km E of Castle Rock, 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.