Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Yountville, CA
No earthquake was likely felt in Yountville in the 24 hours to 9:52 pm PST (05:52 UTC). The last one was M 2.4, 19 km (12 mi) SSE, at 10:47 am PDT on 6 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Yountville
This page: a magnitude 1.6 earthquake was recorded 11 km (7 mi) east of Yountville, CA, at 4:30 am PST on 20 February 2024 (12:30 UTC), 7.7 km deep.
USGS: 11 km E of Yountville, CA
14 km (9 mi) NNE of Napa, CA · 73 km (45 mi) NNE of San Francisco, CA
- When
- 4:30 am PST on 20 February 2024 ()
- Where
- 11 km (7 mi) east of Yountville, CA · earthquakes near Yountville
- Magnitude
- M 1.6 (md)
- Depth
- 7.7 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 13 km NW
- Nearest mapped fault
- Green Valley fault, under 1 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 992 days ago
Earthquake alerts for Yountville, CA
Get a notification in this browser when USGS records an earthquake near Yountville, 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 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 8 km (5 mi) from the epicentre. In Yountville, 11 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: Napa, Green Valley, Vacaville, Saint Helena, Sonoma, Deer Park.
How big was it?
This earthquake released about 7.1 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 7.1 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 2022-09-14 — about 16,000 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 · 24 km SSW of this epicentre
- 5.4 South of Elmira, California · 32 km ESE 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 38.4173, -122.2340. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 13 km (8 mi) | NW | earthquakes near Napa County |
| Solano County, CA | 31 km (19 mi) | ESE | earthquakes near Solano County |
| Yolo County, CA | 41 km (25 mi) | NE | earthquakes near Yolo County |
| Marin County, CA | 60 km (38 mi) | SW | earthquakes near Marin County |
| Contra Costa County, CA | 61 km (38 mi) | SSE | earthquakes near Contra Costa County |
| Sonoma County, CA | 61 km (38 mi) | WNW | earthquakes near Sonoma County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
9 earthquakes have been recorded within 50 km since this one.
- 3.0 4 km NE of Santa Rosa, CA
- 1.5 3 km NE of Saint Helena, CA
- 1.7 7 km SW of Napa, CA
- 2.0 1 km NW of Glen Ellen, CA
- 1.5 5 km E of Vallejo, CA
- 2.3 4 km NNW of American Canyon, CA
- 1.9 6 km W of Glen Ellen, CA
- 2.0 4 km N of Santa Rosa, CA
- 1.8 7 km NE of Rohnert Park, 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.