QuakeIndex

explosion · reviewed by a seismologist

M 1.5ml

8 km N of Amboy, Washington

· -1.1 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 24 kmCowlitz County 30 kmSkamania County 38 kmMultnomah County 49 kmColumbia County 50 kmLewis County 66 kmWashington County 70 kmHood River County 80 kmWahkiakum County 83 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
-1.1 km below the surface
Felt
no reports yet
Nearest
Clark County, 24 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 621 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 45.9868, -122.4375. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, WA 24 km (15 mi) N of here earthquakes near Clark County
Cowlitz County, WA 30 km (19 mi) SE of here earthquakes near Cowlitz County
Skamania County, WA 38 km (23 mi) W of here earthquakes near Skamania County
Multnomah County, OR 49 km (30 mi) N of here earthquakes near Multnomah County
Columbia County, OR 50 km (31 mi) E of here earthquakes near Columbia County
Lewis County, WA 66 km (41 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. 1.5 20 km SSW of Morton, Washington
  2. 2.0 8 km WNW of Warren, Oregon
  3. 1.7 10 km SSE of Toledo, Washington
  4. 1.8 37 km NNE of Amboy, Washington
  5. 1.5 28 km SSE of Mossyrock, Washington
  6. 2.0 1 km N of Longview, Washington
  7. 3.5 20 km S of Morton, Washington
  8. 2.1 20 km SSE of Mossyrock, Washington
  9. 1.8 3 km WSW of Felida, Washington
  10. 1.7 7 km E of Kalama, Washington
  11. 1.7 24 km N of Amboy, Washington
  12. 1.7 24 km N of Amboy, Washington
  13. 2.1 2 km ENE of Ridgefield, Washington
  14. 2.0 38 km NNE of Amboy, Washington
  15. 1.5 3 km ESE of La Center, 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.