QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Klahanie, WA

No earthquake was likely felt in Klahanie in the 24 hours to 8:47 pm PST (04:47 UTC). The last one was M 4.2, 57 km (35 mi) WSW, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Klahanie

This page: a magnitude 1.6 earthquake was recorded 3 km (2 mi) east-southeast of Klahanie, WA, at 1:13 pm PDT on 28 August 2020 (20:13 UTC), 67 km deep.

USGS: 3 km ESE of Klahanie, Washington

30 km (18 mi) ESE of Seattle, WA · 6 km (4 mi) ESE of Sammamish, WA

1:13 pm PDT, Aug 28, 2020 · · 67 km deep · released about 7.6 lb of TNT

Every earthquake near Klahanie Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 13 kmKitsap County 52 kmSnohomish County 57 kmPierce County 59 kmIsland County 85 kmMason County 94 kmThurston County 95 kmSkagit County 104 kmChelan 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
1:13 pm PDT on 28 August 2020 ()
Where
3 km (2 mi) east-southeast of Klahanie, WA · earthquakes near Klahanie
Magnitude
M 1.6 (ml)
Depth
67 km below the surface
Felt
no reports yet
Nearest
King County, 13 km SE
Nearest mapped fault
Seattle fault, 2 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 2267 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 Klahanie, 3 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: Fall City, Issaquah, City of Sammamish, Ames Lake, Carnation, West Lake Sammamish.

How big was it?

This earthquake released about 7.6 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 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 4.6 on 2019-07-12 — about 30,000 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.7 1 km ENE of Dash Point, Washington · 43 km SW of this epicentre
  2. 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 23 km NNE of this epicentre
  3. 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 23 km NNE of this epicentre
  4. 5.0 4 km ENE of Machias, Washington · 49 km N of this epicentre
  5. 5.0 3 km WSW of Des Moines, Washington · 36 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 47.5632, -121.9662. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
King County, WA 13 km (8 mi) SE earthquakes near King County
Kitsap County, WA 52 km (32 mi) W earthquakes near Kitsap County
Snohomish County, WA 57 km (35 mi) NNE earthquakes near Snohomish County
Pierce County, WA 59 km (36 mi) SSW earthquakes near Pierce County
Island County, WA 85 km (53 mi) NW earthquakes near Island County
Mason County, WA 94 km (58 mi) WSW earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.7 4 km SSE of Bainbridge Island, Washington
  2. 2.2 5 km SE of Bainbridge Island, Washington
  3. 1.9 3 km NNW of Fall City, Washington
  4. 1.8 8 km E of Tanner, Washington
  5. 2.8 11 km E of Tanner, Washington
  6. 1.5 1 km NE of Ames Lake, Washington
  7. 2.4 2 km NE of Indianola, Washington
  8. 1.6 0 km ESE of Buckley, Washington
  9. 1.9 11 km SE of Riverbend, Washington
  10. 2.2 12 km ESE of Riverbend, Washington
  11. 2.3 4 km SE of Black Diamond, Washington
  12. 1.9 3 km SSE of Sultan, Washington
  13. 1.8 12 km W of Greenwater, Washington
  14. 1.7 1 km N of Kingsgate, Washington
  15. 2.0 3 km NNE of Southworth, 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.