QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Lofall, WA

Yes: an earthquake was likely felt in Lofall in the last 24 hours. M 1.8, 8 km (5 mi) NNW of Lofall, at 12:24 pm PST on 12 November 2026 (20:24 UTC); the estimated shaking in Lofall was intensity II (weak). Every earthquake near Lofall

This page: a magnitude 1.6 earthquake was recorded 7 km (4 mi) northeast of Lofall, WA, at 1:05 am PDT on 22 July 2018 (08:05 UTC), 21 km deep.

USGS: 6 km NE of Lofall, Washington

33 km (20 mi) NW of Seattle, WA · 23 km (14 mi) WNW of Shoreline, WA

1:05 am PDT, Jul 22, 2018 · · 21 km deep · released about 7.3 lb of TNT

10 km30 km60 km120 km N Kitsap County 25 kmIsland County 34 kmSnohomish County 66 kmJefferson County 69 kmMason County 71 kmKing County 71 kmSan Juan County 81 kmSkagit County 92 kmPierce County 96 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
1:05 am PDT on 22 July 2018 ()
Where
7 km (4 mi) northeast of Lofall, WA · earthquakes near Lofall
Magnitude
M 1.6 (ml)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 25 km S
Nearest mapped fault
Southern Whidbey Island fault, 10 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 3034 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 Lofall, 7 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: Hansville, Port Ludlow, Kingston, Indianola, Poulsbo, Suquamish.

How big was it?

This earthquake released about 7.3 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 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× 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 7.3 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 2 earthquakes of M5 or more within 50 km:

  1. 5.3 Eastern Olympic Peninsula, Washington · 30 km WSW of this epicentre
  2. 5.0 4 km ENE of Machias, Washington · 48 km ENE 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 47.8602, -122.6057. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kitsap County, WA 25 km (15 mi) S earthquakes near Kitsap County
Island County, WA 34 km (21 mi) N earthquakes near Island County
Snohomish County, WA 66 km (41 mi) ENE earthquakes near Snohomish County
Jefferson County, WA 69 km (43 mi) W earthquakes near Jefferson County
Mason County, WA 71 km (44 mi) SW earthquakes near Mason County
King County, WA 71 km (44 mi) SE earthquakes near King 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. 1.7 2 km NW of Indianola, Washington
  2. 2.2 7 km W of Clinton, Washington
  3. 1.7 2 km SSE of Manchester, Washington
  4. 1.5 8 km SSE of Coupeville, Washington
  5. 1.7 6 km SSE of Port Ludlow, Washington
  6. 2.5 0 km N of Woodway, Washington
  7. 1.7 2 km SE of Manchester, Washington
  8. 1.6 9 km NNE of Quilcene, Washington
  9. 1.7 5 km SW of Hansville, Washington
  10. 1.5 2 km NNW of Indianola, Washington
  11. 2.3 0 km ESE of Riverton, Washington
  12. 2.3 1 km NNE of Enetai, Washington
  13. 2.3 1 km SSW of Clinton, Washington
  14. 1.8 7 km ESE of Quilcene, Washington
  15. 2.0 1 km NNE of Silver Firs, 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.