explosion · reviewed by a seismologist
M 1.8ml
Earthquake near Portland, OR
No earthquake was likely felt in Portland in the 24 hours to 1:09 am PST (09:09 UTC). The last one was M 4.4, 110 km (68 mi) S, at 5:52 am PDT on 7 October 2022, estimated intensity II (weak) in town; 6,105 felt reports to USGS. Every earthquake near Portland
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.8 explosion was recorded 44 km (27 mi) southwest of Portland, OR, at 12:07 pm PDT on 26 September 2022 (19:07 UTC), less than 1 km deep.
USGS: 3 km W of Saint Paul, Oregon
46 km (29 mi) SW of Portland, OR · 30 km (18 mi) SW of Tigard, OR
- When
- 12:07 pm PDT on 26 September 2022 ()
- Where
- 44 km (27 mi) southwest of Portland, OR · earthquakes near Portland
- Magnitude
- M 1.8 (ml)
- Depth
- -0.2 km below the surface
- Felt
- no reports yet
- Nearest
- Yamhill County, 24 km W
- Nearest mapped fault
- Mount Angel fault, 18 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 1509 days ago
Earthquake alerts for Portland, OR
Get a notification in this browser when USGS records an earthquake near Portland, OR. 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 Portland, 44 km away, the estimate is intensity I (not felt). 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: Dayton, Dundee, Lafayette, Newberg, McMinnville, Donald.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 14 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 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 760,000× the energy of this one
- Around the size people start to feel M 3.0 68× the energy of this one
- This earthquake M 1.8 about 14 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:
- 5.6 4 km E of Scotts Mills, Oregon · 38 km ESE of this epicentre
- 5.0 3 km SW of Portland, Oregon · 40 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 45.2147, -123.0190. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Yamhill County, OR | 24 km (15 mi) | W | earthquakes near Yamhill County |
| Washington County, OR | 38 km (24 mi) | N | earthquakes near Washington County |
| Polk County, OR | 46 km (29 mi) | SW | earthquakes near Polk County |
| Marion County, OR | 49 km (31 mi) | SE | earthquakes near Marion County |
| Multnomah County, OR | 60 km (37 mi) | NE | earthquakes near Multnomah County |
| Tillamook County, OR | 64 km (40 mi) | WNW | earthquakes near Tillamook County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.6 4 km WSW of Stafford, Oregon
- 1.8 9 km NW of Keizer, Oregon
- 1.6 4 km ESE of Sherwood, Oregon
- 1.5 5 km NE of Amity, Oregon
- 1.6 3 km SE of Canby, Oregon
- 1.5 8 km W of Yamhill, Oregon
- 1.6 3 km SE of Sherwood, Oregon
- 1.9 1 km WNW of Saint Paul, Oregon
- 1.6 3 km SE of Canby, Oregon
- 1.6 9 km NNE of Sheridan, Oregon
- 1.9 10 km NNE of Sheridan, Oregon
- 1.6 7 km SE of Fort Hill, Oregon
- 1.9 3 km WNW of Tigard, Oregon
- 1.9 15 km SE of Scotts Mills, Oregon
- 1.7 13 km N of Willamina, Oregon
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.