Earthquake · reviewed by a seismologist
M 2.7md
Earthquake near Yountville, CA
No earthquake was likely felt in Yountville in the 24 hours to 3:37 am PST (11:37 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 2.7 earthquake was recorded 7 km (4 mi) south-southwest of Yountville, CA, at 11:39 pm PDT on 20 August 2025 (06:39 UTC), 7.7 km deep. 307 people have reported feeling it to USGS.
USGS: 7 km SSW of Yountville, CA
9 km (6 mi) NW of Napa, CA · 63 km (39 mi) N of San Francisco, CA
- When
- 11:39 pm PDT on 20 August 2025 ()
- Where
- 7 km (4 mi) south-southwest of Yountville, CA · earthquakes near Yountville
- Magnitude
- M 2.7 (md)
- Depth
- 7.7 km below the surface
- Felt
- 307 reports · strongest reported intensity IV
- Nearest
- Napa County, 19 km NNE
- Nearest mapped fault
- West Napa fault, 3 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 366 days ago
Earthquake alerts for Yountville, CA
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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 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 23 km (14 mi) from the epicentre. In Yountville, 7 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.
Likely felt in: Agua Caliente 9 km, intensity III · Napa 11 km, intensity III · Kenwood 16 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 320 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 48,000× the energy of this one
- Magna, Utah 2020 M 5.7 34,000× the energy of this one
- Around the size people start to feel M 3.0 3× the energy of this one
- This earthquake M 2.7 about 320 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 370 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 16 km SSE of this epicentre
- 5.4 South of Elmira, California · 43 km E of this epicentre
- 5.3 3 km E of Bloomfield, California · 37 km W of this epicentre
- 5.3 Northern California · 38 km W 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 38.3463, -122.3890. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 19 km (12 mi) | NNE | earthquakes near Napa County |
| Solano County, CA | 40 km (25 mi) | ESE | earthquakes near Solano County |
| Marin County, CA | 45 km (28 mi) | SW | earthquakes near Marin County |
| Sonoma County, CA | 51 km (32 mi) | WNW | earthquakes near Sonoma County |
| Yolo County, CA | 56 km (35 mi) | NE | earthquakes near Yolo County |
| Contra Costa County, CA | 61 km (38 mi) | SE | earthquakes near Contra Costa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
15 earthquakes have been recorded within 50 km since this one.
- 1.8 2 km ENE of Rodeo, CA
- 1.9 14 km E of Angwin, CA
- 1.5 5 km E of Vallejo, CA
- 1.7 6 km WSW of Yountville, CA
- 2.3 6 km SSW of Yountville, CA
- 1.7 13 km NNE of Angwin, CA
- 1.6 7 km ENE of Vallejo, CA
- 1.6 4 km ESE of Vallejo, CA
- 1.7 6 km SSW of Calistoga, CA
- 1.9 7 km ESE of Black Point-Green Point, CA
- 2.1 5 km E of Santa Rosa, CA
- 1.7 2 km ENE of Pacheco, CA
- 2.0 4 km ENE of Windsor, CA
- 1.6 6 km ENE of Vallejo, CA
- 1.7 7 km W of Temelec, 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.