explosion · reviewed by a seismologist
M 1.9ml
Earthquake near Westport, WA
USGS: 7 km NNE of Westport, Washington
- When
- 2:13 pm PST on 9 February 2018 ()
- Where
- 7 km (4 mi) NNE of Westport, WA · earthquakes near Westport
- Magnitude
- M 1.9 (ml)
- Depth
- 4.8 km below the surface
- Felt
- no reports yet
- Nearest
- Grays Harbor County, 26 km NE
- Nearest mapped fault
- Cascadia fold and fault belt, 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 3157 days ago
A magnitude 1.9 earthquake was recorded 7 km (4 mi) NNE of Westport, WA, at 2:13 pm PST on 9 February 2018 (22:13 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Ocean Shores, Hoquiam, Aberdeen, Cosmopolis, Central Park.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 2 earthquakes of M5 or more within 50 km:
- 5.8 8 km N of Satsop, Washington · 48 km ENE of this epicentre
- 5.0 18 km N of Satsop, Washington · 49 km ENE 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 46.9493, -124.0677. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Grays Harbor County, WA | 26 km (16 mi) | NE | earthquakes near Grays Harbor County |
| Pacific County, WA | 49 km (30 mi) | SSE | earthquakes near Pacific County |
| Mason County, WA | 81 km (50 mi) | NE | earthquakes near Mason County |
| Wahkiakum County, WA | 88 km (55 mi) | SE | earthquakes near Wahkiakum County |
| Thurston County, WA | 94 km (58 mi) | E | earthquakes near Thurston County |
| Jefferson County, WA | 104 km (64 mi) | NNE | earthquakes near Jefferson County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.6 0 km S of Pacific Beach, Washington
- 1.9 8 km NW of Aberdeen Gardens, Washington
- 1.7 11 km S of Humptulips, Washington
- 2.0 9 km SSW of Humptulips, Washington
- 2.0 8 km WSW of Neilton, Washington
- 2.1 7 km ENE of Santiago, Washington
- 2.0 14 km SSE of Cosmopolis, Washington
- 1.7 12 km SSE of Cosmopolis, Washington
- 1.8 5 km WSW of Aberdeen Gardens, Washington
- 1.6 2 km ENE of Humptulips, Washington
- 2.1 14 km W of Neilton, Washington
- 1.6 2 km NNE of Raymond, Washington
- 1.8 11 km ENE of Copalis Beach, Washington
- 1.5 17 km SSE of Montesano, Washington
- 1.5 8 km SSW of Cosmopolis, 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.