Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near South Hill, WA
No earthquake was likely felt in South Hill in the 24 hours to 7:27 am PST (15:27 UTC). The last one was M 4.2, 45 km (28 mi) NW, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near South Hill
This page: a magnitude 2.5 earthquake was recorded 34 km (21 mi) southeast of South Hill, WA, at 10:54 am PDT on 18 July 2018 (17:54 UTC), 12 km deep. 5 people have reported feeling it to USGS.
USGS: 17 km NNE of Ashford, Washington
84 km (52 mi) SSE of Seattle, WA · 47 km (29 mi) SSE of Auburn, WA
- When
- 10:54 am PDT on 18 July 2018 ()
- Where
- 34 km (21 mi) southeast of South Hill, WA · earthquakes near South Hill
- Magnitude
- M 2.5 (ml)
- Depth
- 12 km below the surface
- Felt
- 5 reports · strongest reported intensity III
- Nearest
- Pierce County, 21 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2962 days ago
Earthquake alerts for South Hill, WA
Get a notification in this browser when USGS records an earthquake near South Hill, 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 19 km (12 mi) from the epicentre. In South Hill, 34 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: Crocker, Eatonville, Orting, Prairie Heights, Buckley, Prairie Ridge.
How big was it?
This earthquake released about 170 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 89,000× the energy of this one
- Magna, Utah 2020 M 5.7 63,000× the energy of this one
- Around the size people start to feel M 3.0 5.6× the energy of this one
- This earthquake M 2.5 about 170 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 one earthquake of M5 or more within 50 km:
- 6.7 4 km WNW of Roy, Washington · 48 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 46.9115, -121.9762. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Pierce County, WA | 21 km (13 mi) | NW | earthquakes near Pierce County |
| Lewis County, WA | 48 km (30 mi) | SW | earthquakes near Lewis County |
| Thurston County, WA | 65 km (40 mi) | W | earthquakes near Thurston County |
| King County, WA | 65 km (41 mi) | N | earthquakes near King County |
| Kitsap County, WA | 96 km (59 mi) | NNW | earthquakes near Kitsap County |
| Cowlitz County, WA | 96 km (60 mi) | SW | earthquakes near Cowlitz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.9 2 km NNW of Algona, Washington
- 1.9 12 km ENE of Enumclaw, Washington
- 1.7 2 km N of Lakeland South, Washington
- 2.1 22 km ENE of Ashford, Washington
- 1.8 1 km S of Auburn, Washington
- 1.9 15 km N of Ashford, Washington
- 1.5 2 km S of Black Diamond, Washington
- 1.9 23 km ENE of Ashford, Washington
- 1.5 23 km ENE of Ashford, Washington
- 1.7 9 km NE of Ashford, Washington
- 1.5 23 km ENE of Ashford, Washington
- 1.7 23 km ENE of Ashford, Washington
- 1.7 1 km SSE of Kapowsin, Washington
- 1.6 23 km ENE of Ashford, Washington
- 2.1 Puget Sound region, 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.