QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Normandy Park, WA

No earthquake was likely felt in Normandy Park in the 24 hours to 1:01 am PST (09:01 UTC). The last one was M 4.2, 29 km (18 mi) W, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Normandy Park

This page: a magnitude 1.8 earthquake was recorded in Normandy Park, WA, at 9:12 am PST on 20 February 2019 (17:12 UTC), 23 km deep. 6 people have reported feeling it to USGS.

USGS: 1 km NE of Normandy Park, Washington

19 km (12 mi) S of Seattle, WA · in Burien, WA

9:12 am PST, Feb 20, 2019 · · 23 km deep · released about 16 lb of TNT

Every earthquake near Normandy Park Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 32 kmKing County 37 kmPierce County 46 kmMason County 65 kmThurston County 69 kmSnohomish County 79 kmIsland County 83 kmLewis County 97 kmJefferson County 98 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
9:12 am PST on 20 February 2019 ()
Where
in Normandy Park, WA · earthquakes near Normandy Park
Magnitude
M 1.8 (ml)
Depth
23 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Kitsap County, 32 km NW
Nearest mapped fault
Seattle fault, 8 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 2819 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. 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: SeaTac, Burien, Riverton, Des Moines, Tukwila, Boulevard Park.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 The 2001 Nisqually, Washington Earthquake · 45 km SW of this epicentre
  2. 6.7 1 km ENE of Dash Point, Washington · 15 km SSW of this epicentre
  3. 6.1 Puget Sound region, Washington · 33 km W of this epicentre
  4. 5.8 Puget Sound area, Washington · 47 km WSW of this epicentre
  5. 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 48 km NE 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 47.4500, -122.3242. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kitsap County, WA 32 km (20 mi) NW earthquakes near Kitsap County
King County, WA 37 km (23 mi) E earthquakes near King County
Pierce County, WA 46 km (29 mi) SSE earthquakes near Pierce County
Mason County, WA 65 km (40 mi) W earthquakes near Mason County
Thurston County, WA 69 km (43 mi) SW earthquakes near Thurston County
Snohomish County, WA 79 km (49 mi) NNE earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.8 4 km N of Duvall, Washington
  2. 1.8 5 km NNE of Duvall, Washington
  3. 1.6 6 km NE of Fall City, Washington
  4. 1.7 3 km ENE of Enetai, Washington
  5. 1.9 3 km WSW of Wilderness Rim, Washington
  6. 1.6 3 km E of Cathcart, Washington
  7. 2.1 Puget Sound region, Washington
  8. 1.5 3 km ENE of Enetai, Washington
  9. 1.6 1 km SW of Keyport, Washington
  10. 1.5 2 km N of Boulevard Park, Washington
  11. 1.5 2 km SSW of Lynnwood, Washington
  12. 1.6 4 km ESE of Carnation, Washington
  13. 1.6 3 km ENE of Cathcart, Washington
  14. 2.8 8 km NNE of Snoqualmie, Washington
  15. 1.8 1 km N of Fairwood, 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.