Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Napa, CA
No earthquake was likely felt in Napa in the 24 hours to 10:17 am PST (18:17 UTC). The last one was M 2.4, 6 km (3 mi) SE, at 10:47 am PDT on 6 October 2026, estimated intensity III (weak) in town; 1 felt report to USGS. Every earthquake near Napa
This page: a magnitude 1.6 earthquake was recorded 16 km (10 mi) northeast of Napa, CA, at 3:26 am PDT on 28 May 2024 (10:26 UTC), 11 km deep.
USGS: 16 km NE of Napa, CA
73 km (45 mi) NNE of San Francisco, CA · 16 km (10 mi) NE of Napa, CA
- When
- 3:26 am PDT on 28 May 2024 ()
- Where
- 16 km (10 mi) northeast of Napa, CA · earthquakes near Napa
- Magnitude
- M 1.6 (md)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 17 km NW
- Nearest mapped fault
- Green Valley fault, 4 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 576 days ago
Earthquake alerts for Napa, 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 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 5 km (3 mi) from the epicentre. In Napa, 16 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: Yountville, Green Valley, Vacaville, Hartley, Allendale, Fairfield.
How big was it?
This earthquake released about 8.7 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 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 8.7 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 13,000 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 · 27 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 38.4073, -122.1760. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 17 km (11 mi) | NW | earthquakes near Napa County |
| Solano County, CA | 26 km (16 mi) | SE | earthquakes near Solano County |
| Yolo County, CA | 38 km (24 mi) | NE | earthquakes near Yolo County |
| Contra Costa County, CA | 58 km (36 mi) | SSE | earthquakes near Contra Costa County |
| Marin County, CA | 64 km (40 mi) | SW | earthquakes near Marin County |
| Sonoma County, CA | 67 km (41 mi) | WNW | earthquakes near Sonoma County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
43 earthquakes have been recorded within 50 km since this one.
- 2.0 14 km NNE of Pittsburg, CA
- 2.0 7 km E of Vallejo, CA
- 1.8 4 km SSE of Rodeo, CA
- 2.2 4 km SE of Larkfield-Wikiup, CA
- 2.5 3 km W of American Canyon, CA
- 2.1 4 km SE of Larkfield-Wikiup, CA
- 2.5 4 km SE of Larkfield-Wikiup, CA
- 1.8 11 km SSE of Suisun City, CA
- 1.5 5 km E of Vallejo, CA
- 2.4 4 km ESE of El Sobrante, CA
- 2.1 7 km S of Calistoga, CA
- 1.7 6 km SSW of Calistoga, CA
- 1.5 16 km SE of Hidden Valley Lake, CA
- 1.9 16 km SE of Hidden Valley Lake, CA
- 1.9 9 km E of Vallejo, 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.