Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Riverton, WA
No earthquake was likely felt in Riverton in the 24 hours to 10:14 am PST (18:14 UTC). The last one was M 4.2, 33 km (21 mi) WSW, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Riverton
This page: a magnitude 2.5 earthquake was recorded in Riverton, WA, at 3:43 pm PDT on 30 July 2018 (22:43 UTC), 25 km deep. 4 people have reported feeling it to USGS.
USGS: 0 km ESE of Riverton, Washington
16 km (10 mi) SSE of Seattle, WA · in Burien, WA
- When
- 3:43 pm PDT on 30 July 2018 ()
- Where
- in Riverton, WA · earthquakes near Riverton
- Magnitude
- M 2.5 (ml)
- Depth
- 25 km below the surface
- Felt
- 4 reports · strongest reported intensity III
- Nearest
- Kitsap County, 32 km WNW
- Nearest mapped fault
- Seattle fault, 4 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 2950 days ago
Earthquake alerts for Riverton, WA
Get a notification in this browser when USGS records an earthquake near Riverton, 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 it was probably too small to be felt, even directly above it. 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: Tukwila, Boulevard Park, SeaTac, Bryn Mawr-Skyway, Burien, Renton.
How big was it?
This earthquake released about 150 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 5.8 100,000× the energy of this one
- Magna, Utah 2020 M 5.7 72,000× the energy of this one
- Around the size people start to feel M 3.0 6.5× the energy of this one
- This earthquake M 2.5 about 150 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 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.8 The 2001 Nisqually, Washington Earthquake · 50 km SW of this epicentre
- 6.7 1 km ENE of Dash Point, Washington · 20 km SSW of this epicentre
- 6.1 Puget Sound region, Washington · 36 km WSW of this epicentre
- 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 44 km NE of this epicentre
- 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 46 km NE 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 47.4835, -122.2913. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kitsap County, WA | 32 km (20 mi) | WNW | earthquakes near Kitsap County |
| King County, WA | 34 km (21 mi) | E | earthquakes near King County |
| Pierce County, WA | 49 km (31 mi) | SSE | earthquakes near Pierce County |
| Mason County, WA | 68 km (42 mi) | WSW | earthquakes near Mason County |
| Thurston County, WA | 73 km (46 mi) | SW | earthquakes near Thurston County |
| Snohomish County, WA | 75 km (46 mi) | NNE | earthquakes near Snohomish County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 2.3 0 km ESE of Riverton, Washington
- 1.9 11 km ESE of Enumclaw, Washington
- 1.6 4 km WSW of Monroe, Washington
- 1.9 0 km SE of Normandy Park, Washington
- 1.8 1 km NE of Normandy Park, Washington
- 1.6 0 km E of Normandy Park, Washington
- 2.3 1 km NNE of Enetai, Washington
- 1.6 3 km W of Federal Way, Washington
- 2.0 4 km SSW of Roosevelt, Washington
- 1.7 8 km SSW of Wilderness Rim, Washington
- 2.6 8 km SSW of Wilderness Rim, Washington
- 2.0 10 km ENE of Fall City, Washington
- 1.8 1 km E of Browns Point, Washington
- 2.0 1 km NNE of Silver Firs, Washington
- 1.7 6 km W of Lofall, 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.