QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

20 km S of Packwood, Washington

Yes. A magnitude 1.5 earthquake was recorded 20 km S of Packwood, Washington, at 5:03 pm PDT on 29 August 2026 (00:03 UTC), 4.3 km deep.

· 4.3 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skamania County 51 kmLewis County 60 kmYakima County 68 kmPierce County 80 kmCowlitz County 85 kmKlickitat County 90 kmClark County 99 kmHood River County 102 kmKittitas County 106 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 1.5 (ml)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Skamania County, 51 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 74 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 9 km (6 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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.

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 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.7 38 km NNE of Amboy, Washington · 50 km WSW of this epicentre
  2. 5.2 23 km S of Morton, Washington · 48 km W of this epicentre
  3. 5.1 Washington · 48 km WSW of this epicentre
  4. 5.1 38 km NNE of Amboy, Washington · 50 km WSW of this epicentre
  5. 5.1 38 km S of Morton, Washington · 49 km WSW 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 46.4267, -121.6230. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Skamania County, WA 51 km (32 mi) SSW earthquakes near Skamania County
Lewis County, WA 60 km (37 mi) WNW earthquakes near Lewis County
Yakima County, WA 68 km (42 mi) E earthquakes near Yakima County
Pierce County, WA 80 km (50 mi) NNW earthquakes near Pierce County
Cowlitz County, WA 85 km (53 mi) WSW earthquakes near Cowlitz County
Klickitat County, WA 90 km (56 mi) SE earthquakes near Klickitat County

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

Aftershocks so far

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

  1. 1.3 22 km ENE of Ashford, Washington
  2. 1.0 22 km ENE of Ashford, Washington
  3. 0.8 13 km SE of Ashford, Washington
  4. 0.6 3 km SW of Ashford, Washington
  5. 0.1 38 km NE of Amboy, Washington
  6. 0.3 22 km ENE of Ashford, Washington
  7. 0.9 22 km ENE of Ashford, Washington
  8. 0.1 17 km E of Ashford, Washington
  9. 0.5 23 km ENE of Ashford, Washington
  10. 0.5 37 km SSE of Morton, Washington
  11. 1.6 8 km NE of Ashford, Washington
  12. 0.1 8 km NE of Ashford, Washington
  13. 0.1 8 km NE of Ashford, Washington
  14. 0.3 24 km N of Trout Lake, Washington
  15. 0.8 23 km N of Trout Lake, 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.