QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Rodeo, CA

No earthquake was likely felt in Rodeo in the 24 hours to 3:23 am PST (11:23 UTC). The last one was M 1.8, 14 km (9 mi) NNE, at 11:09 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Rodeo

This page: a magnitude 1.8 earthquake was recorded 2 km (1 mi) east-northeast of Rodeo, CA, at 4:26 am PDT on 26 September 2025 (11:26 UTC), 8.9 km deep.

USGS: 2 km ENE of Rodeo, CA

8 km (5 mi) SSE of Vallejo, CA · 33 km (20 mi) NNE of San Francisco, CA

4:26 am PDT, Sep 26, 2025 · · 8.9 km deep · released about 17 lb of TNT

Every earthquake near Rodeo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 29 kmSolano County 37 kmMarin County 44 kmAlameda County 52 kmNapa County 53 kmSan Mateo County 70 kmYolo County 77 kmSan Francisco County 78 kmSonoma County 81 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:26 am PDT on 26 September 2025 ()
Where
2 km (1 mi) east-northeast of Rodeo, CA · earthquakes near Rodeo
Magnitude
M 1.8 (md)
Depth
8.9 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 29 km ESE
Nearest mapped fault
Green Valley fault, 15 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 410 days ago

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 11 km (7 mi) from the epicentre. In Rodeo, 2 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: Crockett 3 km, intensity II · Hercules 5 km, intensity II · Pinole 6 km, intensity II · Benicia 7 km, intensity II · Vallejo 7 km, intensity II · Martinez 10 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 8,800 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.9 The 1906 San Francisco, California Earthquake · 42 km SW of this epicentre
  2. 6.0 The 2014 South Napa, California Earthquake · 21 km NNW of this epicentre
  3. 5.8 The 1980 Livermore, California Earthquake · 47 km ESE of this epicentre
  4. 5.4 South of Elmira, California · 42 km NE of this epicentre
  5. 5.3 The 1957 San Francisco, California Earthquake · 46 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 38.0382, -122.2405. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Contra Costa County, CA 29 km (18 mi) ESE earthquakes near Contra Costa County
Solano County, CA 37 km (23 mi) NE earthquakes near Solano County
Marin County, CA 44 km (28 mi) W earthquakes near Marin County
Alameda County, CA 52 km (32 mi) SSE earthquakes near Alameda County
Napa County, CA 53 km (33 mi) N earthquakes near Napa County
San Mateo County, CA 70 km (44 mi) S earthquakes near San Mateo County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

50 earthquakes have been recorded within 50 km since this one.

  1. 2.1 4 km SE of San Ramon, CA
  2. 1.6 4 km SE of San Ramon, CA
  3. 1.9 4 km SE of San Ramon, CA
  4. 1.6 3 km SE of San Ramon, CA
  5. 2.3 3 km SE of San Ramon, CA
  6. 3.0 4 km SE of San Ramon, CA
  7. 2.9 4 km SE of San Ramon, CA
  8. 2.3 4 km SE of San Ramon, CA
  9. 3.0 4 km SE of San Ramon, CA
  10. 3.8 3 km SE of San Ramon, CA
  11. 1.7 6 km ENE of Vallejo, CA
  12. 1.6 10 km ESE of Black Point-Green Point, CA
  13. 2.1 6 km SW of Kenwood, CA
  14. 1.6 5 km SE of Oakland, CA
  15. 2.4 5 km SE of Oakland, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.