Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Poulsbo, WA
No earthquake was likely felt in Poulsbo in the 24 hours to 1:34 pm PST (21:34 UTC). The last one was M 4.2, 38 km (23 mi) S, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Poulsbo
This page: a magnitude 2.5 earthquake was recorded in Poulsbo, WA, at 8:03 am PDT on 28 April 2021 (15:03 UTC), 22 km deep. 6 people have reported feeling it to USGS.
USGS: 1 km E of Poulsbo, Washington
24 km (15 mi) WNW of Seattle, WA · 21 km (13 mi) W of Shoreline, WA
- When
- 8:03 am PDT on 28 April 2021 ()
- Where
- in Poulsbo, WA · earthquakes near Poulsbo
- Magnitude
- M 2.5 (ml)
- Depth
- 22 km below the surface
- Felt
- 6 reports · strongest reported intensity IV
- Nearest
- Kitsap County, 11 km S
- Nearest mapped fault
- Seattle fault, 13 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 1527 days ago
Earthquake alerts for Poulsbo, WA
Get a notification in this browser when USGS records an earthquake near Poulsbo, 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 3 km (2 mi) from the epicentre. 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: Poulsbo in town, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 86,000× the energy of this one
- Magna, Utah 2020 M 5.7 61,000× the energy of this one
- Around the size people start to feel M 3.0 5.4× the energy of this one
- This earthquake M 2.5 about 180 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 4.1 on 2017-02-23 — about 230 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.7 1 km ENE of Dash Point, Washington · 48 km SSE of this epicentre
- 6.1 Puget Sound region, Washington · 38 km SSW of this epicentre
- 5.3 Eastern Olympic Peninsula, Washington · 29 km WNW of this epicentre
- 5.0 3 km WSW of Des Moines, Washington · 43 km SSE 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 47.7340, -122.6252. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kitsap County, WA | 11 km (7 mi) | S | earthquakes near Kitsap County |
| Island County, WA | 47 km (29 mi) | N | earthquakes near Island County |
| Mason County, WA | 59 km (37 mi) | SW | earthquakes near Mason County |
| King County, WA | 65 km (41 mi) | ESE | earthquakes near King County |
| Jefferson County, WA | 68 km (42 mi) | W | earthquakes near Jefferson County |
| Snohomish County, WA | 73 km (46 mi) | ENE | earthquakes near Snohomish County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.7 3 km WNW of Gorst, Washington
- 1.8 7 km ESE of Blyn, Washington
- 1.5 1 km WSW of Silverdale, Washington
- 1.5 2 km WNW of Gig Harbor, Washington
- 1.8 4 km SSW of Port Ludlow, Washington
- 1.6 6 km SW of Des Moines, Washington
- 1.9 1 km ESE of Esperance, Washington
- 1.7 12 km NNW of Quilcene, Washington
- 2.2 1 km NNE of Cathcart, Washington
- 1.6 7 km WNW of Gorst, Washington
- 1.5 7 km ENE of Allyn, Washington
- 1.8 5 km N of Lofall, Washington
- 1.9 8 km ENE of Port Townsend, Washington
- 1.5 3 km NNE of White Center, Washington
- 1.7 1 km NNE of Enetai, 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.