Earthquake · automatic estimate, may change
M 2.4md
Earthquake near Petaluma, CA
USGS: 6 km WNW of Petaluma, CA
6 km (4 mi) WNW of Petaluma, CA · 58 km (36 mi) NNW of San Francisco, CA
- When
- 3:02 pm PDT on 2 October 2026 ()
- Where
- 6 km (4 mi) WNW of Petaluma, CA · earthquakes near Petaluma
- Magnitude
- M 2.4 (md)
- Depth
- -0.7 km below the surface
- Felt
- no reports yet
- Nearest
- Marin County, 23 km S
- Nearest mapped fault
- Rodgers Creek fault, 12 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 hours ago
A magnitude 2.4 earthquake was recorded 6 km (4 mi) WNW of Petaluma, CA, at 3:02 pm PDT on 2 October 2026 (22:02 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Penngrove, Cotati, Rohnert Park, Temelec, El Verano, Eldridge.
How big was it?
This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
- Magna, Utah 2020 M 5.7 99,000× the energy of this one
- Around the size people start to feel M 3.0 8.8× the energy of this one
- This earthquake M 2.4 about 110 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 1,100 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 · 34 km E of this epicentre
- 5.3 3 km E of Bloomfield, California · 12 km NW of this epicentre
- 5.3 Northern California · 13 km NW 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 38.2533, -122.6977. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marin County, CA | 23 km (14 mi) | S | earthquakes near Marin County |
| Sonoma County, CA | 36 km (22 mi) | NNW | earthquakes near Sonoma County |
| Napa County, CA | 43 km (27 mi) | NE | earthquakes near Napa County |
| San Francisco County, CA | 65 km (41 mi) | SSW | earthquakes near San Francisco County |
| Solano County, CA | 66 km (41 mi) | E | earthquakes near Solano County |
| Contra Costa County, CA | 75 km (47 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
No further earthquakes have been recorded within 50 km since this one.
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.