QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near Tanner, WA

Yes. A magnitude 1.9 earthquake was recorded 3 km (2 mi) NE of Tanner, WA, at 3:39 am PDT on 17 August 2017 (10:39 UTC), 17 km deep. 10 people have reported feeling it to USGS.

This was on 17 August 2017. The latest near Tanner: M 2.5 on 26 June 2026.

USGS: 2 km NE of Tanner, Washington

49 km (31 mi) ESE of Seattle, WA · 26 km (16 mi) ESE of Sammamish, WA

3:39 am PDT, Aug 17, 2017 · · 17 km deep · released about 21 lb of TNT

Every earthquake near Tanner Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 9 kmPierce County 59 kmSnohomish County 62 kmKitsap County 72 kmKittitas County 89 kmChelan County 92 kmIsland County 102 kmThurston County 104 kmMason County 110 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
3:39 am PDT on 17 August 2017 ()
Where
3 km (2 mi) NE of Tanner, WA · earthquakes near Tanner
Magnitude
M 1.9 (ml)
Depth
17 km below the surface
Felt
10 reports · strongest reported intensity III
Nearest
King County, 9 km W
Nearest mapped fault
Rattlesnake Mountain fault, 6 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 1528 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 Tanner, 3 km away, the estimate is intensity II (weak). 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: Riverbend, North Bend, Wilderness Rim, Snoqualmie, Fall City, Hobart.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 3 earthquakes of M5 or more within 50 km:

  1. 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 32 km NNW of this epicentre
  2. 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 29 km NNW of this epicentre
  3. 5.0 3 km WSW of Des Moines, Washington · 50 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 47.4957, -121.7200. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
King County, WA 9 km (5 mi) W earthquakes near King County
Pierce County, WA 59 km (37 mi) SSW earthquakes near Pierce County
Snohomish County, WA 62 km (39 mi) N earthquakes near Snohomish County
Kitsap County, WA 72 km (44 mi) WNW earthquakes near Kitsap County
Kittitas County, WA 89 km (55 mi) ESE earthquakes near Kittitas County
Chelan County, WA 92 km (57 mi) ENE earthquakes near Chelan County

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

Aftershocks so far

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

  1. 1.8 13 km ESE of Enumclaw, Washington
  2. 1.5 0 km NNE of Lake Marcel-Stillwater, Washington
  3. 1.6 Washington
  4. 2.2 0 km S of Union Hill-Novelty Hill, Washington
  5. 1.6 0 km N of Bonney Lake, Washington
  6. 1.7 11 km ESE of Enumclaw, Washington
  7. 2.0 11 km ENE of Enumclaw, Washington
  8. 1.8 14 km S of Snoqualmie Pass, Washington
  9. 1.8 10 km S of Snoqualmie Pass, Washington
  10. 1.6 14 km S of Snoqualmie Pass, Washington
  11. 2.1 6 km E of Carnation, Washington
  12. 1.5 7 km ESE of Carnation, Washington
  13. 1.6 11 km S of Wilderness Rim, Washington
  14. 1.6 9 km NE of Duvall, Washington
  15. 1.6 10 km W of Greenwater, 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.