explosion · reviewed by a seismologist
M 1.8ml
Earthquake near Cosmopolis, WA
No earthquake was likely felt in Cosmopolis in the 24 hours to 12:02 am PST (08:02 UTC). The last one was M 4.2, 94 km (58 mi) ENE, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Cosmopolis
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.8 explosion was recorded 8 km (5 mi) south-southwest of Cosmopolis, WA, at 5:45 pm PST on 5 March 2024 (01:45 UTC), less than 1 km deep.
USGS: 7 km SSW of Cosmopolis, Washington
- When
- 5:45 pm PST on 5 March 2024 ()
- Where
- 8 km (5 mi) south-southwest of Cosmopolis, WA · earthquakes near Cosmopolis
- Magnitude
- M 1.8 (ml)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Grays Harbor County, 25 km N
- Nearest mapped fault
- Cascadia fold and fault belt, 22 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 982 days ago
Earthquake alerts for Cosmopolis, WA
Get a notification in this browser when USGS records an earthquake near Cosmopolis, 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, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Cosmopolis, 8 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: Aberdeen, Central Park, Hoquiam, Montesano, Raymond, Westport.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 730,000× the energy of this one
- Around the size people start to feel M 3.0 65× the energy of this one
- This earthquake M 1.8 about 15 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:
- 5.8 8 km N of Satsop, Washington · 33 km NE of this epicentre
- 5.1 Olympic Peninsula, Washington · 46 km NE of this epicentre
- 5.0 18 km N of Satsop, Washington · 38 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 46.8887, -123.7977. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Grays Harbor County, WA | 25 km (16 mi) | N | earthquakes near Grays Harbor County |
| Pacific County, WA | 37 km (23 mi) | S | earthquakes near Pacific County |
| Mason County, WA | 70 km (43 mi) | NE | earthquakes near Mason County |
| Wahkiakum County, WA | 72 km (45 mi) | SSE | earthquakes near Wahkiakum County |
| Thurston County, WA | 74 km (46 mi) | E | earthquakes near Thurston County |
| Clatsop County, OR | 96 km (60 mi) | S | earthquakes near Clatsop County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 1.1 5 km N of Tokeland, Washington
- 1.5 8 km NNW of Ocean Park, Washington
- 1.6 2 km NE of Hoquiam, Washington
- 1.6 5 km NNW of South Bend, Washington
- 1.0 7 km WNW of Humptulips, Washington
- 1.0 17 km E of Humptulips, Washington
- 1.4 20 km SW of Grayland, Washington
- 1.8 2 km WSW of Ocean City, Washington
- 1.7 14 km S of Cosmopolis, Washington
- 1.8 7 km NNW of Pe Ell, Washington
- 1.5 10 km NNE of Tokeland, Washington
- 2.2 12 km ENE of Humptulips, Washington
- 1.8 3 km WSW of South Bend, Washington
- 1.8 3 km S of Willapa, Washington
- 1.6 5 km WNW of Humptulips, 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.