Earthquake · reviewed by a seismologist
M 1.1ml
Earthquake near Fall City, WA
USGS: 3 km NNW of Fall City, Washington
10 km (6 mi) E of Sammamish, WA · 33 km (21 mi) E of Seattle, WA
- When
- 1:46 am PDT on 1 October 2026 ()
- Where
- 3 km (2 mi) NNW of Fall City, WA · earthquakes near Fall City
- Magnitude
- M 1.1 (ml)
- Depth
- 16 km below the surface
- Felt
- no reports yet
- Nearest
- King County, 13 km SSE
- Nearest mapped fault
- Rattlesnake Mountain fault, under 1 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 35 hours ago
A magnitude 1.1 earthquake was recorded 3 km (2 mi) NNW of Fall City, WA, at 1:46 am PDT on 1 October 2026 (08:46 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Carnation, Ames Lake, Klahanie, Snoqualmie, City of Sammamish, Lake Marcel-Stillwater.
How big was it?
This earthquake released about 1.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 11,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,700,000× the energy of this one
- Around the size people start to feel M 3.0 680× the energy of this one
- This earthquake M 1.1 about 1.4 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 4.6 on 2019-07-12 — about 160,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.7 1 km ENE of Dash Point, Washington · 48 km SW of this epicentre
- 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 19 km N of this epicentre
- 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 19 km NNE of this epicentre
- 5.0 4 km ENE of Machias, Washington · 46 km N of this epicentre
- 5.0 3 km WSW of Des Moines, Washington · 41 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 47.5918, -121.9080. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| King County, WA | 13 km (8 mi) | SSE | earthquakes near King County |
| Snohomish County, WA | 53 km (33 mi) | NNE | earthquakes near Snohomish County |
| Kitsap County, WA | 56 km (35 mi) | W | earthquakes near Kitsap County |
| Pierce County, WA | 63 km (39 mi) | SSW | earthquakes near Pierce County |
| Island County, WA | 85 km (53 mi) | NW | earthquakes near Island County |
| Mason County, WA | 99 km (61 mi) | WSW | earthquakes near Mason County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has been recorded within 50 km since this one.
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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| location | 2 km NNW of Fall City, Washington | 3 km NNW of Fall City, Washington | |
| longitude | -121.9 | -121.91 | |
| latitude | 47.59 | 47.59 | |
| depth | 16.63 | 16 | |
| magnitude | 1.06 | 1.11 |
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.