Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near Mill Plain, WA
USGS: 3 km SE of Mill Plain, Washington
18 km (11 mi) ENE of Portland, OR · 11 km (7 mi) E of Vancouver, WA
- When
- 6:24 am PST on 27 February 2017 ()
- Where
- 4 km (2 mi) SE of Mill Plain, WA · earthquakes near Mill Plain
- Magnitude
- M 1.6 (ml)
- Depth
- 8.1 km below the surface
- Felt
- no reports yet
- Nearest
- Multnomah County, 9 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3504 days ago
A magnitude 1.6 earthquake was recorded 4 km (2 mi) SE of Mill Plain, WA, at 6:24 am PST on 27 February 2017 (14:24 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Fern Prairie, Camas, Washougal, Fairview, Orchards, Wood Village.
How big was it?
This earthquake released about 7.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.3 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:
- 5.2 5 km E of Bridgeton, Oregon · 12 km WSW of this epicentre
- 5.0 3 km SW of Portland, Oregon · 23 km SW 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 45.6215, -122.4555. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Multnomah County, OR | 9 km (5 mi) | SSE | earthquakes near Multnomah County |
| Clark County, WA | 17 km (10 mi) | N | earthquakes near Clark County |
| Washington County, OR | 51 km (31 mi) | W | earthquakes near Washington County |
| Clackamas County, OR | 55 km (34 mi) | SSE | earthquakes near Clackamas County |
| Skamania County, WA | 59 km (37 mi) | NE | earthquakes near Skamania County |
| Columbia County, OR | 60 km (37 mi) | NW | earthquakes near Columbia County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.7 4 km WSW of Yacolt, Washington
- 1.6 1 km N of West Haven, Oregon
- 1.5 11 km NNE of Sandy, Oregon
- 1.6 1 km WSW of West Slope, Oregon
- 1.6 1 km NNE of Saint Helens, Oregon
- 1.5 3 km N of Portland, Oregon
- 1.6 6 km SSE of Sandy, Oregon
- 1.6 12 km N of Amboy, Washington
- 1.5 2 km NNW of Mount Hood Village, Oregon
- 2.0 4 km SE of Ridgefield, Washington
- 1.6 8 km S of Scappoose, Oregon
- 1.7 7 km NW of North Portland, Oregon
- 2.6 8 km S of Scappoose, Oregon
- 2.0 Washington-Oregon border region
- 1.7 8 km NE of Woodland, 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.