QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

19 km NE of Packwood, Washington

Yes. A magnitude 3.1 earthquake was recorded 19 km NE of Packwood, Washington, at 11:11 am PST on 7 February 2024 (19:11 UTC), 4.7 km deep. 15 people have reported feeling it to USGS.

· 4.7 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 59 kmYakima County 67 kmLewis County 68 kmKittitas County 76 kmKing County 86 kmSkamania County 87 kmThurston County 102 kmCowlitz County 108 kmKlickitat County 112 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 3.1 (ml)
Depth
4.7 km below the surface
Felt
15 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Pierce County, 59 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 913 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 40 km (25 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× more

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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.0 23 km ESE of Packwood, Washington · 26 km SSE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 46.7445, -121.5163. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Pierce County, WA 59 km (37 mi) NW earthquakes near Pierce County
Yakima County, WA 67 km (42 mi) ESE earthquakes near Yakima County
Lewis County, WA 68 km (42 mi) WSW earthquakes near Lewis County
Kittitas County, WA 76 km (48 mi) NE earthquakes near Kittitas County
King County, WA 86 km (54 mi) NNW earthquakes near King County
Skamania County, WA 87 km (54 mi) SSW earthquakes near Skamania 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. 1.7 23 km ENE of Ashford, Washington
  2. 2.0 22 km ENE of Ashford, Washington
  3. 1.6 23 km ENE of Ashford, Washington
  4. 1.7 17 km NE of Ashford, Washington
  5. 2.3 23 km ENE of Ashford, Washington
  6. 1.6 23 km ENE of Ashford, Washington
  7. 1.6 22 km ENE of Ashford, Washington
  8. 2.3 22 km ENE of Ashford, Washington
  9. 1.6 22 km ENE of Ashford, Washington
  10. 1.6 22 km ENE of Ashford, Washington
  11. 1.5 23 km ENE of Ashford, Washington
  12. 1.6 23 km ENE of Ashford, Washington
  13. 2.0 23 km NNE of Packwood, Washington
  14. 1.6 12 km E of Greenwater, Washington
  15. 1.8 14 km SW of Packwood, 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.