Earthquake · automatic estimate, may change
M 2.1md
Earthquake near Green Valley, CA
No earthquake was likely felt in Green Valley in the 24 hours to 7:57 pm PST (03:57 UTC). The last one was M 1.8, 13 km (8 mi) S, at 11:09 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Green Valley
This page: a magnitude 2.1 earthquake was recorded 4 km (3 mi) south of Green Valley, CA, at 9:36 am PDT on 16 October 2025 (16:36 UTC), less than 1 km deep. 21 people have reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.
USGS: 4 km S of Green Valley, CA
12 km (8 mi) WSW of Fairfield, CA · 53 km (33 mi) NNE of San Francisco, CA
- When
- 9:36 am PDT on 16 October 2025 ()
- Where
- 4 km (3 mi) south of Green Valley, CA · earthquakes near Green Valley
- Magnitude
- M 2.1 (md)
- Depth
- -0.5 km below the surface
- Felt
- 21 reports · strongest reported intensity II
- Nearest
- Solano County, 20 km ENE
- Nearest mapped fault
- Green Valley fault, under 1 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 392 days ago
Earthquake alerts for Green Valley, CA
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Alerts are on for .
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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 Green Valley, 4 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.
Likely felt in: Suisun 11 km, intensity II · Fairfield 11 km, intensity II · Napa 14 km, intensity II · Vallejo 15 km, intensity II. Estimated for each town centre; each link is that town's own record.
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 4.5 on 2019-10-15 — about 3,100 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 13 km W of this epicentre
- 5.4 South of Elmira, California · 25 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 38.2130, -122.1590. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Solano County, CA | 20 km (12 mi) | ENE | earthquakes near Solano County |
| Napa County, CA | 36 km (22 mi) | NNW | earthquakes near Napa County |
| Contra Costa County, CA | 37 km (23 mi) | SSE | earthquakes near Contra Costa County |
| Marin County, CA | 54 km (34 mi) | WSW | earthquakes near Marin County |
| Yolo County, CA | 56 km (35 mi) | NNE | earthquakes near Yolo County |
| Alameda County, CA | 67 km (41 mi) | SSE | earthquakes near Alameda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.5 6 km SW of Kenwood, CA
- 3.1 6 km SW of Kenwood, CA
- 4.0 6 km W of Glen Ellen, CA
- 2.4 7 km WSW of Kenwood, CA
- 2.9 2 km E of Piedmont, CA
- 1.9 5 km WSW of Yountville, CA
- 2.6 6 km WSW of Kenwood, CA
- 2.1 5 km WSW of Yountville, CA
- 2.9 6 km WSW of Kenwood, CA
- 3.1 6 km WSW of Kenwood, CA
- 2.9 6 km WSW of Kenwood, CA
- 2.0 6 km SW of Kenwood, CA
- 1.9 6 km WSW of Kenwood, CA
- 3.3 6 km WSW of Kenwood, CA
- 2.2 9 km ESE of Clayton, 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.