QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

30 km SSW of Packwood, Washington

· 11 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skamania County 39 kmLewis County 45 kmCowlitz County 65 kmPierce County 78 kmClark County 82 kmYakima County 88 kmThurston County 96 kmHood River County 97 kmMultnomah County 101 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
11 km below the surface
Felt
no reports yet
Nearest
Skamania County, 39 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2846 days ago

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

How big was it?

This earthquake released about 9.6 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 46.3740, -121.8777. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skamania County, WA 39 km (24 mi) N of here earthquakes near Skamania County
Lewis County, WA 45 km (28 mi) ESE of here earthquakes near Lewis County
Cowlitz County, WA 65 km (40 mi) ENE of here earthquakes near Cowlitz County
Pierce County, WA 78 km (49 mi) SSE of here earthquakes near Pierce County
Clark County, WA 82 km (51 mi) NE of here earthquakes near Clark County
Yakima County, WA 88 km (54 mi) W of here earthquakes near Yakima County

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

Aftershocks so far

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

  1. 1.6 31 km S of Morton, Washington
  2. 2.0 37 km NNE of Amboy, Washington
  3. 2.4 9 km SE of Mossyrock, Washington
  4. 1.6 37 km NNE of Amboy, Washington
  5. 2.0 5 km WNW of Packwood, Washington
  6. 1.7 22 km S of Morton, Washington
  7. 1.7 7 km ESE of Ashford, Washington
  8. 1.6 7 km ESE of Ashford, Washington
  9. 1.8 20 km SSW of Morton, Washington
  10. 2.9 4 km W of Ashford, Washington
  11. 1.6 18 km SSE of Mossyrock, Washington
  12. 1.6 5 km ESE of Mossyrock, Washington
  13. 1.5 18 km E of Packwood, Washington
  14. 1.9 23 km NE of Amboy, Washington
  15. 2.2 37 km SSE of Morton, 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.