Earthquake · reviewed by a seismologist
M 1.1md
Earthquake near Maplewood, WA
USGS: 5 km SE of Maplewood, Washington
29 km (18 mi) SSW of Seattle, WA · 14 km (9 mi) NNW of Tacoma, WA
- When
- 1:48 am PDT on 29 September 2026 ()
- Where
- 6 km (3 mi) SE of Maplewood, WA · earthquakes near Maplewood
- Magnitude
- M 1.1 (md)
- Depth
- 22 km below the surface
- Felt
- no reports yet
- Nearest
- Kitsap County, 32 km NNW
- Nearest mapped fault
- Tacoma 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 3 days ago
A magnitude 1.1 earthquake was recorded 6 km (3 mi) SE of Maplewood, WA, at 1:48 am PDT on 29 September 2026 (08:48 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Canterwood, Gig Harbor, Vashon, Browns Point, Purdy, Wauna.
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 10,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,400,000× the energy of this one
- Around the size people start to feel M 3.0 660× 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 4.1 on 2017-02-23 — about 29,000 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 The 2001 Nisqually, Washington Earthquake · 30 km SW of this epicentre
- 6.7 4 km WNW of Roy, Washington · 41 km S of this epicentre
- 6.7 1 km ENE of Dash Point, Washington · 8 km SE of this epicentre
- 6.1 Puget Sound region, Washington · 20 km W of this epicentre
- 5.8 Puget Sound area, Washington · 32 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 47.3730, -122.4957. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kitsap County, WA | 32 km (20 mi) | NNW | earthquakes near Kitsap County |
| Pierce County, WA | 44 km (27 mi) | SE | earthquakes near Pierce County |
| Mason County, WA | 51 km (32 mi) | W | earthquakes near Mason County |
| King County, WA | 51 km (32 mi) | ENE | earthquakes near King County |
| Thurston County, WA | 55 km (34 mi) | SSW | earthquakes near Thurston County |
| Island County, WA | 88 km (55 mi) | N | earthquakes near Island County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 earthquakes have been recorded within 50 km since this one.
- 1.0 3 km E of Bethel, Washington
- 1.3 4 km WNW of Wauna, Washington
- 0.4 2 km SSE of Carbonado, Washington
- 1.6 5 km W of Burley, Washington
- 1.9 6 km WNW of Wauna, Washington
- 1.3 4 km WNW of Wauna, Washington
- 4.2 6 km WNW of Wauna, 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.