QuakeIndex

explosion · reviewed by a seismologist

M 1.6ml

6 km SW of La Grande, Washington

· -0.5 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis County 24 kmPierce County 33 kmThurston County 38 kmCowlitz County 70 kmMason County 86 kmKing County 88 kmSkamania County 92 kmKitsap County 96 kmWahkiakum County 98 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
Lewis County, 24 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2694 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 7.1 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 7.1 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 46.7952, -122.3770. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis County, WA 24 km (15 mi) N of here earthquakes near Lewis County
Pierce County, WA 33 km (21 mi) SSW of here earthquakes near Pierce County
Thurston County, WA 38 km (24 mi) ESE of here earthquakes near Thurston County
Cowlitz County, WA 70 km (44 mi) NNE of here earthquakes near Cowlitz County
Mason County, WA 86 km (54 mi) SE of here earthquakes near Mason County
King County, WA 88 km (54 mi) SSW of here earthquakes near King 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. 1.8 19 km WSW of Alder, Washington
  2. 1.6 2 km SE of Kapowsin, Washington
  3. 1.6 5 km ESE of Mossyrock, Washington
  4. 1.7 1 km WNW of Bonney Lake, Washington
  5. 1.5 14 km NNE of Ashford, Washington
  6. 2.1 9 km NNE of Mossyrock, Washington
  7. 1.6 6 km NNW of Ashford, Washington
  8. 1.6 2 km SSE of Kapowsin, Washington
  9. 1.9 8 km NE of Ashford, Washington
  10. 1.6 2 km SSW of Kapowsin, Washington
  11. 1.6 0 km ESE of Buckley, Washington
  12. 1.6 5 km WNW of DuPont, Washington
  13. 1.5 17 km NE of Ashford, Washington
  14. 1.6 14 km SE of Mossyrock, Washington
  15. 2.5 19 km NNE of Ashford, 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

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