Earthquake · automatic estimate, may change
M 2.2md
Earthquake near Cotati, CA
USGS: 8 km W of Cotati, CA
69 km (43 mi) NNW of San Francisco, CA · 16 km (10 mi) SSW of Santa Rosa, CA
- When
- 2:47 pm PDT on 29 September 2026 ()
- Where
- 8 km (5 mi) W of Cotati, CA · earthquakes near Cotati
- Magnitude
- M 2.2 (md)
- Depth
- 4.3 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 25 km NNW
- Nearest mapped fault
- San Andreas fault, 18 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 3 days ago
A magnitude 2.2 earthquake was recorded 8 km (5 mi) W of Cotati, CA, at 2:47 pm PDT on 29 September 2026 (21:47 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Rohnert Park, Sebastopol, Penngrove, Graton, Santa Rosa, Occidental.
How big was it?
This earthquake released about 67 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 230,000× the energy of this one
- Magna, Utah 2020 M 5.7 160,000× the energy of this one
- Around the size people start to feel M 3.0 14× the energy of this one
- This earthquake M 2.2 about 67 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 1,700 times the energy of this one.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 44 km ESE of this epicentre
- 5.3 3 km E of Bloomfield, California · 1 km SSW of this epicentre
- 5.3 Northern California · 2 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 38.3233, -122.8008. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 25 km (16 mi) | NNW | earthquakes near Sonoma County |
| Marin County, CA | 31 km (19 mi) | S | earthquakes near Marin County |
| Napa County, CA | 46 km (29 mi) | ENE | earthquakes near Napa County |
| San Francisco County, CA | 69 km (43 mi) | SSW | earthquakes near San Francisco County |
| Solano County, CA | 75 km (47 mi) | E | earthquakes near Solano County |
| Contra Costa County, CA | 87 km (54 mi) | ESE | earthquakes near Contra Costa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
5 earthquakes have been recorded within 50 km since this one.
- 2.4 6 km WNW of Petaluma, CA
- 1.8 4 km NW of Santa Rosa, CA
- 1.7 3 km SSW of Anderson Springs, CA
- 0.8 3 km SE of The Geysers, CA
- 1.1 4 km SW of Anderson Springs, 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.