Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Dunnigan, CA
No earthquake was likely felt in Dunnigan in the 24 hours to 8:33 am PST (16:33 UTC). The last one was M 4.2, 85 km (53 mi) W, at 7:40 pm PDT on 28 July 2026, estimated intensity II (weak) in town; 240 felt reports to USGS. Every earthquake near Dunnigan
This page: a magnitude 2.5 earthquake was recorded 8 km (5 mi) northwest of Dunnigan, CA, at 12:19 pm PDT on 22 July 2021 (19:19 UTC), 16 km deep. 6 people have reported feeling it to USGS.
USGS: 8km NW of Dunnigan, CA
64 km (39 mi) NW of Sacramento, CA · 38 km (24 mi) NW of Woodland, CA
- When
- 12:19 pm PDT on 22 July 2021 ()
- Where
- 8 km (5 mi) northwest of Dunnigan, CA · earthquakes near Dunnigan
- Magnitude
- M 2.5 (md)
- Depth
- 16 km below the surface
- Felt
- 6 reports · strongest reported intensity III
- Nearest
- Sutter County, 30 km ENE
- Nearest mapped fault
- Great Valley thrust fault system, 13 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 1874 days ago
Earthquake alerts for Dunnigan, CA
Get a notification in this browser when USGS records an earthquake near Dunnigan, CA. 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 16 km (10 mi) from the epicentre. In Dunnigan, 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: Arbuckle, Williams, Esparto.
How big was it?
This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
- Magna, Utah 2020 M 5.7 59,000× the energy of this one
- Around the size people start to feel M 3.0 5.2× the energy of this one
- This earthquake M 2.5 about 180 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 since 1900 lists no earthquake of M5 or more within 50 km.
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 38.9415, -122.0228. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sutter County, CA | 30 km (18 mi) | ENE | earthquakes near Sutter County |
| Yolo County, CA | 31 km (19 mi) | SSE | earthquakes near Yolo County |
| Colusa County, CA | 32 km (20 mi) | NW | earthquakes near Colusa County |
| Napa County, CA | 55 km (34 mi) | SSW | earthquakes near Napa County |
| Lake County, CA | 65 km (40 mi) | WNW | earthquakes near Lake County |
| Yuba County, CA | 69 km (43 mi) | ENE | earthquakes near Yuba 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.
- 1.9 11km ENE of Hidden Valley Lake, CA
- 1.6 19km ENE of Clearlake Oaks, CA
- 1.7 14km E of Angwin, CA
- 1.5 15km E of Angwin, CA
- 1.6 13km ESE of Hidden Valley Lake, CA
- 2.0 12km ESE of Hidden Valley Lake, CA
- 1.9 12km ESE of Hidden Valley Lake, CA
- 2.0 12km ESE of Hidden Valley Lake, CA
- 1.7 17km E of Angwin, CA
- 2.2 15km ENE of Angwin, CA
- 1.8 14km NNE of Angwin, CA
- 2.0 7km WNW of Davis, CA
- 2.0 6km WNW of Davis, CA
- 1.9 14km E of Angwin, CA
- 1.6 9km ESE of Hidden Valley Lake, CA
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.