Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near City of Sammamish, WA
No earthquake was likely felt in City of Sammamish in the 24 hours to 5:16 am PST (13:16 UTC). The last one was M 4.2, 56 km (35 mi) WSW, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near City of Sammamish
This page: a magnitude 1.6 earthquake was recorded 48 km (30 mi) east of City of Sammamish, WA, at 7:38 pm PDT on 22 October 2025 (02:38 UTC), 10 km deep.
USGS: 4 km WSW of Skykomish, Washington
71 km (44 mi) E of Seattle, WA · 48 km (30 mi) ENE of Sammamish, WA
- When
- 7:38 pm PDT on 22 October 2025 ()
- Where
- 48 km (30 mi) east of City of Sammamish, WA · earthquakes near City of Sammamish
- Magnitude
- M 1.6 (ml)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- King County, 38 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 386 days ago
Earthquake alerts for City of Sammamish, WA
Get a notification in this browser when USGS records an earthquake near City of Sammamish, 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 5 km (3 mi) from the epicentre. In City of Sammamish, 48 km away, the estimate is intensity I (not felt). 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: Gold Bar.
How big was it?
This earthquake released about 7.8 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.
- Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
- Around the size people start to feel M 3.0 120× the energy of this one
- This earthquake M 1.6 about 7.8 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:
- 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 36 km WNW of this epicentre
- 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 32 km WNW 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 47.6857, -121.4137. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| King County, WA | 38 km (24 mi) | SW | earthquakes near King County |
| Snohomish County, WA | 49 km (30 mi) | NNW | earthquakes near Snohomish County |
| Chelan County, WA | 62 km (39 mi) | ENE | earthquakes near Chelan County |
| Kittitas County, WA | 83 km (52 mi) | SE | earthquakes near Kittitas County |
| Pierce County, WA | 90 km (56 mi) | SW | earthquakes near Pierce County |
| Kitsap County, WA | 93 km (58 mi) | W | earthquakes near Kitsap County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.4 6 km SW of Wilderness Rim, Washington
- 1.8 6 km WSW of Wilderness Rim, Washington
- 1.0 6 km WSW of Wilderness Rim, Washington
- 1.3 13 km SE of Verlot, Washington
- 2.6 5 km WSW of Wilderness Rim, Washington
- 1.1 4 km NNE of Tanner, Washington
- 0.8 14 km SE of Verlot, Washington
- 1.8 5 km WSW of Wilderness Rim, Washington
- 0.9 3 km NNE of Lake Marcel-Stillwater, Washington
- 0.9 13 km SE of Verlot, Washington
- 1.7 0 km NE of May Creek, Washington
- 1.2 10 km E of Carnation, Washington
- 1.2 13 km SE of Verlot, Washington
- 1.1 3 km NNW of Fall City, Washington
- 1.2 4 km ENE of Mirrormont, 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.