Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Rio Vista, CA
No earthquake was likely felt in Rio Vista in the 24 hours to 12:02 am PST (08:02 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 1.5 earthquake was recorded 9 km (5 mi) south-southeast of Rio Vista, CA, at 2:07 am PST on 25 December 2017 (10:07 UTC), less than 1 km deep.
USGS: 8km SSE of Rio Vista, CA
89 km (55 mi) N of San Jose, CA · 16 km (10 mi) NE of Antioch, CA
- When
- 2:07 am PST on 25 December 2017 ()
- Where
- 9 km (5 mi) south-southeast of Rio Vista, CA · earthquakes near Rio Vista
- Magnitude
- M 1.5 (md)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Solano County, 31 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3241 days ago
Earthquake alerts for Rio Vista, CA
Get a notification in this browser when USGS records an earthquake near Rio Vista, 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 10 km (6 mi) from the epicentre. In Rio Vista, 9 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 9 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
- Around the size people start to feel M 3.0 150× the energy of this one
- This earthquake M 1.5 about 6.2 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 5.8 The 1980 Livermore, California Earthquake · 29 km SSW of this epicentre
- 5.4 South of Elmira, California · 31 km NW of this epicentre
- 5.4 9 km NE of Livermore, California · 38 km S of this epicentre
- 5.1 11 km E of Blackhawk, California · 32 km SSW 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 38.0890, -121.6725. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Solano County, CA | 31 km (19 mi) | NW | earthquakes near Solano County |
| Contra Costa County, CA | 31 km (19 mi) | SW | earthquakes near Contra Costa County |
| San Joaquin County, CA | 39 km (24 mi) | ESE | earthquakes near San Joaquin County |
| Sacramento County, CA | 49 km (31 mi) | NE | earthquakes near Sacramento County |
| Alameda County, CA | 53 km (33 mi) | SSW | earthquakes near Alameda County |
| Yolo County, CA | 69 km (43 mi) | NNW | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 2.8 2km WSW of Diablo, CA
- 3.5 2km ENE of Danville, CA
- 3.4 2km ENE of Danville, CA
- 1.5 2km SW of Diablo, CA
- 1.6 2km E of Danville, CA
- 3.3 2km ENE of Danville, CA
- 1.6 1km WNW of Diablo, CA
- 1.9 2km WSW of Diablo, CA
- 2.8 2km WSW of Diablo, CA
- 2.0 2km WSW of Diablo, CA
- 1.7 2km W of Diablo, CA
- 2.1 2km WSW of Diablo, CA
- 1.7 2km WSW of Diablo, CA
- 2.6 2km W of Diablo, CA
- 2.1 2km W of Diablo, 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.