QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

7 km E of Kalama, Washington

· -0.4 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cowlitz County 23 kmColumbia County 27 kmClark County 32 kmMultnomah County 56 kmWashington County 56 kmSkamania County 61 kmWahkiakum County 62 kmLewis County 71 kmClatsop County 74 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 1.7 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Cowlitz County, 23 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 822 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 45.9957, -122.7460. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cowlitz County, WA 23 km (14 mi) SSW of here earthquakes near Cowlitz County
Columbia County, OR 27 km (17 mi) ENE of here earthquakes near Columbia County
Clark County, WA 32 km (20 mi) NW of here earthquakes near Clark County
Multnomah County, OR 56 km (35 mi) NNW of here earthquakes near Multnomah County
Washington County, OR 56 km (35 mi) NNE of here earthquakes near Washington County
Skamania County, WA 61 km (38 mi) W of here earthquakes near Skamania County

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

Aftershocks so far

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

  1. 1.6 13 km NE of Vernonia, Oregon
  2. 1.6 2 km NNE of Columbia City, Oregon
  3. 1.6 3 km W of Yacolt, Washington
  4. 1.7 18 km E of West Side Highway, Washington
  5. 1.6 19 km NE of Kalama, Washington
  6. 1.8 8 km SW of Scappoose, Oregon
  7. 1.6 21 km ENE of Kalama, Washington
  8. 1.9 1 km NNW of Battle Ground, Washington
  9. 1.5 27 km NNW of Amboy, Washington
  10. 1.9 5 km WSW of Yacolt, Washington
  11. 1.8 5 km N of West Haven, Oregon
  12. 1.6 31 km N of Amboy, Washington
  13. 1.6 10 km WSW of Felida, Washington
  14. 1.6 12 km NNE of Amboy, Washington
  15. 2.0 5 km NW of North Portland, Oregon

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

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