QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

21 km ENE of Kalama, Washington

· -0.5 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 14 kmClark County 35 kmColumbia County 41 kmSkamania County 50 kmLewis County 58 kmMultnomah County 61 kmWahkiakum County 68 kmWashington County 71 kmClatsop County 86 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 349 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 7.6 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 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 46.0817, -122.5907. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 14 km (9 mi) SSE of here earthquakes near Cowlitz County
Clark County, WA 35 km (22 mi) NNW of here earthquakes near Clark County
Columbia County, OR 41 km (25 mi) ENE of here earthquakes near Columbia County
Skamania County, WA 50 km (31 mi) W of here earthquakes near Skamania County
Lewis County, WA 58 km (36 mi) SSW of here earthquakes near Lewis County
Multnomah County, OR 61 km (38 mi) NNW of here earthquakes near Multnomah County

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

Aftershocks so far

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

  1. 1.8 4 km WSW of Yacolt, Washington
  2. 1.8 27 km N of Amboy, Washington
  3. 2.1 4 km W of Yacolt, Washington
  4. 1.8 3 km E of Kalama, Washington
  5. 2.3 37 km NNE of Amboy, Washington
  6. 1.5 3 km WSW of Kalama, Washington
  7. 1.6 2 km NE of Lewisville, Washington
  8. 2.6 18 km NE of Amboy, Washington
  9. 1.5 37 km NNE of Amboy, Washington
  10. 1.6 20 km E of Castle Rock, Washington
  11. 1.6 38 km NE of Amboy, Washington
  12. 2.1 4 km WSW of Yacolt, Washington
  13. 1.6 9 km S of Mossyrock, Washington
  14. 1.9 38 km NE of Amboy, Washington
  15. 1.6 5 km SSW 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.