explosion · reviewed by a seismologist
M 2.1ml
Earthquake near Jefferson, OR
No earthquake was likely felt in Jefferson in the 24 hours to 10:56 pm PST (06:56 UTC). The last one was M 3.2, 41 km (26 mi) NNW, at 7:58 am PST on 23 November 2025, estimated intensity II (weak) in town; 228 felt reports to USGS. Every earthquake near Jefferson
No: USGS classifies this as a explosion, not an earthquake. A magnitude 2.1 explosion was recorded 2 km (1 mi) west-southwest of Jefferson, OR, at 1:00 pm PDT on 16 May 2025 (20:00 UTC), less than 1 km deep.
USGS: 2 km WSW of Jefferson, Oregon
23 km (14 mi) S of Salem, OR · 11 km (7 mi) NNE of Albany, OR
- When
- 1:00 pm PDT on 16 May 2025 ()
- Where
- 2 km (1 mi) west-southwest of Jefferson, OR · earthquakes near Jefferson
- Magnitude
- M 2.1 (ml)
- Depth
- -0.4 km below the surface
- Felt
- no reports yet
- Nearest
- Polk County, 35 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 542 days ago
Earthquake alerts for Jefferson, OR
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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 18 km (11 mi) from the epicentre. In Jefferson, 2 km away, the estimate is intensity III (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: Millersburg, Albany, Turner, Aumsville, Independence, Tangent.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
- Magna, Utah 2020 M 5.7 230,000× the energy of this one
- Around the size people start to feel M 3.0 20× the energy of this one
- This earthquake M 2.1 about 47 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
The largest earthquake within 50 km since 2016 was M 4.4 on 2022-10-07 — about 2,500 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.6 4 km E of Scotts Mills, Oregon · 49 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 44.7155, -123.0357. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Polk County, OR | 35 km (22 mi) | NW | earthquakes near Polk County |
| Benton County, OR | 39 km (25 mi) | SW | earthquakes near Benton County |
| Marion County, OR | 42 km (26 mi) | ENE | earthquakes near Marion County |
| Linn County, OR | 47 km (29 mi) | ESE | earthquakes near Linn County |
| Yamhill County, OR | 63 km (39 mi) | NNW | earthquakes near Yamhill County |
| Lincoln County, OR | 70 km (43 mi) | W | earthquakes near Lincoln County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
31 earthquakes have been recorded within 50 km since this one.
- 1.6 3 km SSW of Scotts Mills, Oregon
- 1.8 7 km NNW of Philomath, Oregon
- 1.6 1 km SW of Mount Angel, Oregon
- 1.4 2 km NNW of Falls City, Oregon
- 1.2 13 km SE of Scotts Mills, Oregon
- 1.8 2 km ENE of Blodgett, Oregon
- 1.8 5 km NW of Lacomb, Oregon
- 2.0 2 km SE of Amity, Oregon
- 1.5 9 km ESE of Scotts Mills, Oregon
- 1.6 5 km NW of Lacomb, Oregon
- 1.7 7 km ESE of Amity, Oregon
- 2.0 6 km W of Lacomb, Oregon
- 1.9 7 km S of Dayton, Oregon
- 1.6 4 km NE of Falls City, Oregon
- 1.8 8 km W of Falls City, 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.