QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Tacoma, WA

No earthquake was likely felt in Tacoma in the 24 hours to 1:04 pm PST (21:04 UTC). The last one was M 4.2, 27 km (17 mi) NW, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Tacoma

This page: a magnitude 1.6 earthquake was recorded 33 km (21 mi) west of Tacoma, WA, at 6:06 am PDT on 31 August 2025 (13:06 UTC), 24 km deep.

USGS: 8 km SSW of Grapeview, Washington

56 km (35 mi) SW of Seattle, WA · 25 km (16 mi) N of Olympia, WA

6:06 am PDT, Aug 31, 2025 · · 24 km deep · released about 8.7 lb of TNT

Every earthquake near Tacoma Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mason County 24 kmThurston County 37 kmKitsap County 45 kmPierce County 60 kmGrays Harbor County 73 kmJefferson County 77 kmKing County 83 kmLewis County 85 kmIsland 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
6:06 am PDT on 31 August 2025 ()
Where
33 km (21 mi) west of Tacoma, WA · earthquakes near Tacoma
Magnitude
M 1.6 (ml)
Depth
24 km below the surface
Felt
no reports yet
Nearest
Mason County, 24 km WNW
Nearest mapped fault
Tacoma fault, 12 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 433 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Tacoma, 33 km away, the estimate is intensity I (not felt). 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.

Earthquakes near other towns within 30 km: Home, Longbranch, Key Center, Allyn, Shelton, Rosedale.

How big was it?

This earthquake released about 8.7 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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

The largest earthquake within 50 km since 2016 was M 4.1 on 2017-02-23 — about 4,700 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 The 2001 Nisqually, Washington Earthquake · 18 km SE of this epicentre
  2. 6.7 4 km WNW of Roy, Washington · 36 km SE of this epicentre
  3. 6.7 1 km ENE of Dash Point, Washington · 37 km E of this epicentre
  4. 6.1 Puget Sound region, Washington · 18 km NNE of this epicentre
  5. 5.8 Puget Sound area, Washington · 2 km NNW 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 47.2652, -122.8870. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Mason County, WA 24 km (15 mi) WNW earthquakes near Mason County
Thurston County, WA 37 km (23 mi) S earthquakes near Thurston County
Kitsap County, WA 45 km (28 mi) NNE earthquakes near Kitsap County
Pierce County, WA 60 km (38 mi) ESE earthquakes near Pierce County
Grays Harbor County, WA 73 km (45 mi) WSW earthquakes near Grays Harbor County
Jefferson County, WA 77 km (48 mi) NW earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.6 5 km W of Burley, Washington
  2. 1.9 6 km WNW of Wauna, Washington
  3. 1.3 4 km WNW of Wauna, Washington
  4. 4.2 6 km WNW of Wauna, Washington
  5. 1.1 5 km SE of Maplewood, Washington
  6. 1.1 3 km NNW of Dash Point, Washington
  7. 1.0 6 km SE of McCleary, Washington
  8. 0.4 11 km NE of Hoodsport, Washington
  9. 0.7 9 km SSE of Shelton, Washington
  10. 1.6 6 km NE of Rochester, Washington
  11. 1.7 2 km NNW of Enetai, Washington
  12. 2.2 2 km WSW of Wauna, Washington
  13. 1.5 5 km ENE of Belfair, Washington
  14. 1.7 10 km NE of Hoodsport, Washington
  15. 1.9 10 km NE of Hoodsport, 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.