QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

10 km SSE of Mossyrock, Washington

· -0.8 km deep · released about 7.3 lb of TNT

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10 km30 km60 km120 km N Lewis County 15 kmCowlitz County 34 kmSkamania County 59 kmThurston County 63 kmPierce County 70 kmClark County 75 kmColumbia County 76 kmWahkiakum County 79 kmMultnomah County 100 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
-0.8 km below the surface
Felt
no reports yet
Nearest
Lewis County, 15 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1392 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 7.3 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× 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 7.3 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 46.4470, -122.4178. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 15 km (9 mi) SSW of here earthquakes near Lewis County
Cowlitz County, WA 34 km (21 mi) NE of here earthquakes near Cowlitz County
Skamania County, WA 59 km (37 mi) NW of here earthquakes near Skamania County
Thurston County, WA 63 km (39 mi) SSE of here earthquakes near Thurston County
Pierce County, WA 70 km (44 mi) SSW of here earthquakes near Pierce County
Clark County, WA 75 km (47 mi) N of here earthquakes near Clark County

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

Aftershocks so far

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

  1. 1.7 33 km NNE of Amboy, Washington
  2. 3.0 33 km NNE of Amboy, Washington
  3. 1.8 8 km SSW of Morton, Washington
  4. 1.5 21 km SE of Morton, Washington
  5. 1.7 6 km S of Onalaska, Washington
  6. 1.6 Washington
  7. 1.5 38 km NNE of Amboy, Washington
  8. 1.5 8 km SSE of Mineral, Washington
  9. 1.5 10 km ESE of Centralia, Washington
  10. 1.6 23 km S of Morton, Washington
  11. 1.8 10 km WSW of Alder, Washington
  12. 1.6 19 km SSW of Mossyrock, Washington
  13. 1.7 36 km SSE of Morton, Washington
  14. 2.1 38 km NNE of Amboy, Washington
  15. 1.6 31 km NNE of Amboy, 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.