explosion · reviewed by a seismologist
M 1.8ml
Earthquake near Port Ludlow, WA
Yes: an earthquake was likely felt in Port Ludlow in the last 24 hours. M 1.8, 5 km (3 mi) SSW of Port Ludlow, at 12:24 pm PST on 12 November 2026 (20:24 UTC); the estimated shaking in Port Ludlow was intensity II (weak). Every earthquake near Port Ludlow
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.8 explosion was recorded 5 km (3 mi) south-southwest of Port Ludlow, WA, at 11:42 am PDT on 2 September 2021 (18:42 UTC), less than 1 km deep.
USGS: 5 km SSW of Port Ludlow, Washington
39 km (25 mi) NW of Seattle, WA · 30 km (19 mi) WNW of Shoreline, WA
- When
- 11:42 am PDT on 2 September 2021 ()
- Where
- 5 km (3 mi) south-southwest of Port Ludlow, WA · earthquakes near Port Ludlow
- Magnitude
- M 1.8 (ml)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Kitsap County, 27 km S
- Nearest mapped fault
- Southern Whidbey Island fault, 17 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 1893 days ago
Earthquake alerts for Port Ludlow, WA
Get a notification in this browser when USGS records an earthquake near Port Ludlow, WA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. In Port Ludlow, 5 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: Lofall, Hansville, Poulsbo, Bangor Trident Base, Port Hadlock-Irondale, Kingston.
USGS catalogues this as explosion, not an earthquake.
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.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- 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 one earthquake of M5 or more within 50 km:
- 5.3 Eastern Olympic Peninsula, Washington · 24 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 47.8813, -122.7078. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kitsap County, WA | 27 km (17 mi) | S | earthquakes near Kitsap County |
| Island County, WA | 31 km (19 mi) | N | earthquakes near Island County |
| Jefferson County, WA | 62 km (38 mi) | W | earthquakes near Jefferson County |
| Mason County, WA | 69 km (43 mi) | SSW | earthquakes near Mason County |
| Snohomish County, WA | 73 km (45 mi) | ENE | earthquakes near Snohomish County |
| San Juan County, WA | 76 km (47 mi) | NNW | earthquakes near San Juan County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.8 3 km NNW of Picnic Point, Washington
- 1.9 1 km SSW of Erlands Point-Kitsap Lake, Washington
- 1.5 7 km WNW of Lofall, Washington
- 1.8 2 km SSE of Lake Forest Park, Washington
- 1.9 7 km SSW of Port Ludlow, Washington
- 1.9 7 km WNW of Lofall, Washington
- 1.5 8 km WNW of Lofall, Washington
- 3.7 7 km WNW of Lofall, Washington
- 1.5 16 km NE of Jamestown, Washington
- 1.5 5 km W of Gorst, Washington
- 1.7 6 km E of Quilcene, Washington
- 2.6 24 km SSW of River Road, Washington
- 1.6 7 km WSW of Coupeville, Washington
- 1.6 5 km SW of Port Ludlow, Washington
- 1.8 6 km NNW of Kingston, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.