Earthquake · automatic estimate, may change
M 2.2ml
Earthquake near Grand Mound, WA
No earthquake was likely felt in Grand Mound in the 24 hours to 9:35 am PST (17:35 UTC). The last one was M 4.2, 72 km (44 mi) NNE, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Grand Mound
This page: a magnitude 2.2 earthquake was recorded 4 km (2 mi) north-northeast of Grand Mound, WA, at 4:10 am PDT on 5 August 2025 (11:10 UTC), 36 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 3 km NNE of Grand Mound, Washington
26 km (16 mi) SSW of Olympia, WA · 101 km (63 mi) SSW of Seattle, WA
- When
- 4:10 am PDT on 5 August 2025 ()
- Where
- 4 km (2 mi) north-northeast of Grand Mound, WA · earthquakes near Grand Mound
- Magnitude
- M 2.2 (ml)
- Depth
- 36 km below the surface
- Felt
- no reports yet
- Nearest
- Thurston County, 18 km NE
- Nearest mapped fault
- Olympia structure, 24 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 465 days ago
Earthquake alerts for Grand Mound, WA
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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 it was probably too small to be felt, even directly above it. In Grand Mound, 4 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.
Earthquakes near other towns within 30 km: Rochester, Fords Prairie, Tenino, Centralia, Chehalis, Tumwater.
How big was it?
This earthquake released about 55 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 280,000× the energy of this one
- Magna, Utah 2020 M 5.7 190,000× the energy of this one
- Around the size people start to feel M 3.0 17× the energy of this one
- This earthquake M 2.2 about 55 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 3 earthquakes of M5 or more within 50 km:
- 6.8 The 2001 Nisqually, Washington Earthquake · 42 km NNE of this epicentre
- 6.7 4 km WNW of Roy, Washington · 37 km NE of this epicentre
- 5.8 8 km N of Satsop, Washington · 46 km NW 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 46.8177, -122.9865. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Thurston County, WA | 18 km (11 mi) | NE | earthquakes near Thurston County |
| Lewis County, WA | 53 km (33 mi) | ESE | earthquakes near Lewis County |
| Mason County, WA | 61 km (38 mi) | NNW | earthquakes near Mason County |
| Wahkiakum County, WA | 67 km (42 mi) | SSW | earthquakes near Wahkiakum County |
| Pacific County, WA | 67 km (42 mi) | WSW | earthquakes near Pacific County |
| Pierce County, WA | 68 km (43 mi) | ENE | earthquakes near Pierce County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 1.8 3 km SW of Winlock, Washington
- 1.2 11 km S of Shelton, Washington
- 1.0 2 km NNE of Mossyrock, Washington
- 1.6 5 km NE of McCleary, Washington
- 1.4 15 km WSW of Tumwater, Washington
- 0.5 11 km S of Shelton, Washington
- 1.5 6 km WSW of Napavine, Washington
- 1.4 9 km ESE of McCleary, Washington
- 1.7 3 km NNE of Winlock, Washington
- 1.1 11 km S of Shelton, Washington
- 1.0 6 km SE of McCleary, Washington
- 0.7 9 km SSE of Shelton, Washington
- 1.2 12 km S of Rainier, Washington
- 1.7 6 km W of Mossyrock, Washington
- 1.6 6 km NE of Rochester, 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.