Earthquake · automatic estimate, may change
M 1.9md
Earthquake near Rio Vista, CA
No earthquake was likely felt in Rio Vista in the 24 hours to 7:12 pm PST (03:12 UTC). The last one was M 3.1, 35 km (22 mi) SSW, at 12:25 am PDT on 12 September 2026, estimated intensity II (weak) in town; 257 felt reports to USGS. Every earthquake near Rio Vista
This page: a magnitude 1.9 earthquake was recorded 12 km (7 mi) north-northwest of Rio Vista, CA, at 10:57 am PDT on 24 August 2025 (17:57 UTC), 6.4 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 13 km NNW of Rio Vista, CA
44 km (27 mi) SW of Sacramento, CA · 21 km (13 mi) SE of Vacaville, CA
- When
- 10:57 am PDT on 24 August 2025 ()
- Where
- 12 km (7 mi) north-northwest of Rio Vista, CA · earthquakes near Rio Vista
- Magnitude
- M 1.9 (md)
- Depth
- 6.4 km below the surface
- Felt
- no reports yet
- Nearest
- Solano County, 15 km W
- Nearest mapped fault
- Great Valley thrust fault system, 16 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 445 days ago
Earthquake alerts for Rio Vista, 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 13 km (8 mi) from the epicentre. In Rio Vista, 12 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: Rio Vista 12 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 6,900 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 · 48 km W of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 46 km S of this epicentre
- 5.4 South of Elmira, California · 13 km WNW of this epicentre
- 5.1 11 km E of Blackhawk, California · 49 km S 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 38.2535, -121.7687. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Solano County, CA | 15 km (9 mi) | W | earthquakes near Solano County |
| Contra Costa County, CA | 40 km (25 mi) | SSW | earthquakes near Contra Costa County |
| Sacramento County, CA | 43 km (27 mi) | ENE | earthquakes near Sacramento County |
| Yolo County, CA | 49 km (30 mi) | NNW | earthquakes near Yolo County |
| San Joaquin County, CA | 56 km (35 mi) | SE | earthquakes near San Joaquin County |
| Napa County, CA | 56 km (35 mi) | WNW | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 1.7 6 km ENE of Vallejo, CA
- 1.7 4 km E of Brentwood, CA
- 2.6 2 km WNW of Concord, CA
- 1.6 8 km NNW of Lafayette, CA
- 2.0 8 km E of Suisun City, CA
- 1.6 7 km NNW of Lafayette, CA
- 1.5 7 km NNW of Lafayette, CA
- 2.4 7 km NNW of Lafayette, CA
- 2.9 7 km N of Orinda, CA
- 2.5 7 km NNW of Lafayette, CA
- 2.8 8 km NNW of Lafayette, CA
- 2.3 7 km NNW of Lafayette, CA
- 2.1 8 km ENE of Vallejo, CA
- 2.1 1 km SW of Vallejo, CA
- 2.1 4 km S of Green Valley, 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.