QuakeIndex

Earthquakes in Mason County, Washington

← Earthquakes in Washington

The most recent earthquake of M2.5 or more near Mason County was M 4.2, 6 km WNW of Wauna, Washington, 34 km (21 mi) E of the centre of Mason County, at 2:05 pm PDT on 29 September 2026, 28 km deep. 9,329 people reported feeling it to USGS. The estimated shaking at the centre of Mason County was intensity III (weak), felt by some people at rest indoors. 7 smaller earthquakes have been recorded near Mason County since.

In the last 24 hours, 1 earthquake of M1.5 or more was recorded within 50 km (31 mi) of the centre of Mason County: M 1.9, 7 km WSW of Erlands Point-Kitsap Lake, Washington, 37 km (23 mi) NE of the centre of Mason County, at 11:46 am PST.

Last 24 hours
1
Last 7 days
1
Last 30 days
4 · an average 30 days here since 2016: 2.8
Last 12 months
41 · largest M 4.2 on 29 September 2026
Since 2016
366 earthquakes of M1.5 or more
Largest since 2016
M 4.2 on 29 September 2026, 6 km WNW of Wauna, Washington
Nearest mapped fault
Olympia structure, 7 km from the centre to its surface trace

Latest quake, 24 hours and 7 days: the QuakeIndex database, which reads USGS every 30 seconds, read at ; 30 days and 12 months: the QuakeIndex catalogue, counted to · earthquakes of M1.5 or more within 50 km (31 mi) of the centre of Mason County · shaking is estimated for the centre with the intensity equation USGS Did You Feel It? uses

0

Quiet QuakeIndex 0 / 100

0 quakes of M1.5 or larger in the last 7 days within 50 km. Normal for here is 0 to 1 in a week.

Compared against Mason County, Washington's own 10 years · USGS catalogue · updated

If you felt one

QuakeIndex does not issue warnings or forecasts. For earthquake early warning see ShakeAlert and the MyShake app.

The last 30 days

Oct 15 Oct 30 Nov 13
Each mark is a day's largest quake within range; its size is the magnitude. The shaded band is the magnitude a day's largest quake normally falls in here (M1.6–M2.1), from this place's own 10-year record. A mark above the band is a bigger day than usual.

Show these earthquakes on your own site: a free card with this strip and the latest quakes near Mason County, Washington, for a local news site, school or neighborhood page.

Live · last 7 days

Latest earthquakes within 50 km

None within 50 km in the latest snapshot we hold; the full 7 days load from USGS as this page opens.

Source USGS · snapshot of

The last 7 days on the map

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Every earthquake within 50 km of Mason County, Washington in the last 7 days, from the USGS feed. Colour and size are magnitude; tap one for its page.

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The centre is 47.351, -123.173, the Census internal point of Mason County, Washington from the US Census Bureau Gazetteer (2024). Activity on this page is measured within 50 km of it — the dashed circle.

Largest on record nearby

The strongest shaking this record implies at the centre of Mason County, Washington is intensity III (weak), from the M 4.1 of 2017, 18 km away. At that level a few people indoors notice it; most do not.

MagnitudeWhenWhereShaking here (est.)
M 4.2 6 km WNW of Wauna, Washington · felt by 9,329 III · Weak
M 4.1 11 km NE of Hoodsport, Washington · felt by 3,359 III · Weak
M 4.1 38 km NE of Amanda Park, Washington · felt by 107 II · Weak
M 3.8 3 km WSW of Skokomish, Washington · felt by 164 II · Weak
M 3.7 12 km NNE of Aberdeen Gardens, Washington · felt by 40 II · Weak
M 3.6 29 km ENE of Amanda Park, Washington · felt by 24 II · Weak
M 3.4 21 km ENE of Amanda Park, Washington · felt by 17 II · Weak
M 3.4 8 km WNW of Gorst, Washington · felt by 568 II · Weak

From the QuakeIndex catalogue, built from the USGS FDSN event service · within 50 km of the centre above. Shaking is an estimate for the centre from magnitude, depth and distance, with the intensity equation USGS Did You Feel It? uses (Atkinson & Wald, 2007), on the Modified Mercalli scale. Ground conditions change it locally; it is a description of the past, not a hazard rating.

Before 2016

The USGS record from 1900 to 2015 lists 6 earthquakes of M5 or more within 50 km of the centre of Mason County, Washington:

  1. 6.8 The 2001 Nisqually, Washington Earthquake · 40 km ESE of the centre
  2. 6.1 Puget Sound region, Washington · 32 km E of the centre
  3. 5.8 Puget Sound area, Washington · 22 km ESE of the centre
  4. 5.8 8 km N of Satsop, Washington · 38 km SW of the centre
  5. 5.1 Olympic Peninsula, Washington · 24 km SW of the centre
  6. 5.0 18 km N of Satsop, Washington · 32 km SW of the centre

USGS ComCat, M5+ from 1900 to 2015. Epicentres of early earthquakes are estimates. This is the record, not a forecast.

Nearest mapped faults

USGS Quaternary Fault and Fold Database, within 50 km. Near is not the same as on, and faults with no surface trace are not in it.

Town pages near Mason County, Washington

Shelton 16 km · 6 M2.5+ named after it · Artondale 42 km · 0 M2.5+ named after it · Bremerton 47 km · 10 M2.5+ named after it · Silverdale 49 km · 0 M2.5+ named after it · University Place 49 km · 0 M2.5+ named after it

Each town page lists every M1.5+ earthquake within 30 km since 2016 and the ones USGS named after it. Town names: GeoNames (CC BY 4.0).

Be ready

Earthquakes cannot be predicted, here or anywhere, so the useful step is the one taken beforehand. The advice below is from the agencies responsible for it.