Earthquake · reviewed by a seismologist
M 3.9ml
Earthquake near Sequim, WA
No earthquake was likely felt in Sequim in the 24 hours to 4:27 pm PST (00:27 UTC). The last one was M 4.2, 81 km (50 mi) SSE, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Sequim
This page: a magnitude 3.9 earthquake was recorded 18 km (11 mi) south of Sequim, WA, at 4:18 pm PST on 5 March 2025 (00:18 UTC), 42 km deep. 268 people have reported feeling it to USGS.
USGS: 14 km SW of Blyn, Washington
68 km (42 mi) WNW of Seattle, WA
- When
- 4:18 pm PST on 5 March 2025 ()
- Where
- 18 km (11 mi) south of Sequim, WA · earthquakes near Sequim
- Magnitude
- M 3.9 (ml)
- Depth
- 42 km below the surface
- Felt
- 268 reports · strongest reported intensity IV
- Measured shaking
- intensity III (ShakeMap)
- USGS impact alert
- green
- Nearest
- Jefferson County, 32 km WSW
- Nearest mapped fault
- Lake Creek-Boundary Creek fault, 16 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 545 days ago
Earthquake alerts for Sequim, WA
Get a notification in this browser when USGS records an earthquake near Sequim, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 78 km (48 mi) from the epicentre. In Sequim, 18 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.
Likely felt in: Sequim 18 km, intensity II · Port Angeles 31 km, intensity II · Port Townsend 36 km, intensity II · Poulsbo 42 km, intensity II · Silverdale 46 km, intensity II · Coupeville 47 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 10 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 16,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 730× the energy of this one
- Magna, Utah 2020 M 5.7 520× the energy of this one
- This earthquake M 3.9 about 10 tons of TNT
- Around the size people start to feel M 3.0 this one released 22× more
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 4.3 on 2023-10-09 — about 4.3 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.3 Eastern Olympic Peninsula, Washington · 17 km SE 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 47.9240, -123.1408. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Jefferson County, WA | 32 km (20 mi) | WSW | earthquakes near Jefferson County |
| Island County, WA | 44 km (27 mi) | NE | earthquakes near Island County |
| Kitsap County, WA | 48 km (30 mi) | SE | earthquakes near Kitsap County |
| Clallam County, WA | 59 km (37 mi) | WNW | earthquakes near Clallam County |
| Mason County, WA | 64 km (40 mi) | S | earthquakes near Mason County |
| San Juan County, WA | 65 km (40 mi) | N | earthquakes near San Juan County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 2.1 6 km NNW of Lofall, Washington
- 1.5 11 km N of Hoodsport, Washington
- 1.6 2 km W of Port Townsend, Washington
- 2.0 8 km W of Gorst, Washington
- 1.6 3 km W of Quilcene, Washington
- 1.5 5 km WSW of Erlands Point-Kitsap Lake, Washington
- 1.7 11 km NW of Belfair, Washington
- 1.6 2 km SW of Port Ludlow, Washington
- 1.9 14 km WNW of Belfair, Washington
- 1.9 6 km SSE of Port Ludlow, Washington
- 1.5 6 km SSE of Port Ludlow, Washington
- 1.6 5 km SSE of Port Ludlow, Washington
- 1.5 3 km SSE of Port Ludlow, Washington
- 1.8 10 km S of Victoria, Canada
- 1.8 3 km SE of Quilcene, 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.