Earthquake · automatic estimate, may change
M 1.5md
Earthquake near Santa Rosa, CA
No earthquake was likely felt in Santa Rosa in the 24 hours to 1:40 pm PST (21:40 UTC). The last one was M 1.9, 5 km (3 mi) NE, at 2:01 pm PDT on 23 October 2026, estimated intensity II (weak) in town. Every earthquake near Santa Rosa
This page: a magnitude 1.5 earthquake was recorded 33 km (20 mi) north-northwest of Santa Rosa, CA, at 11:44 pm PDT on 29 September 2025 (06:44 UTC), 4.4 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 7 km SW of The Geysers, CA
32 km (20 mi) NNW of Santa Rosa, CA · 111 km (69 mi) NNW of San Francisco, CA
- When
- 11:44 pm PDT on 29 September 2025 ()
- Where
- 33 km (20 mi) north-northwest of Santa Rosa, CA · earthquakes near Santa Rosa
- Magnitude
- M 1.5 (md)
- Depth
- 4.4 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 24 km SSW
- Nearest mapped fault
- Maacama fault, 3 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 409 days ago
Earthquake alerts for Santa Rosa, CA
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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 9 km (6 mi) from the epicentre. In Santa Rosa, 33 km away, the estimate is intensity I (not felt). 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.
Earthquakes near other towns within 30 km: Cobb, Healdsburg, Middletown, Windsor, Cloverdale, Hidden Valley Lake.
How big was it?
This earthquake released about 5.4 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 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 5.0 on 2016-12-14 — about 180,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.3 3 km E of Bloomfield, California · 46 km S of this epicentre
- 5.3 Northern California · 45 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 38.7248, -122.8093. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 24 km (15 mi) | SSW | earthquakes near Sonoma County |
| Lake County, CA | 43 km (27 mi) | N | earthquakes near Lake County |
| Napa County, CA | 48 km (30 mi) | ESE | earthquakes near Napa County |
| Colusa County, CA | 71 km (44 mi) | NE | earthquakes near Colusa County |
| Marin County, CA | 75 km (47 mi) | S | earthquakes near Marin County |
| Yolo County, CA | 79 km (49 mi) | E | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.5 2 km NW of The Geysers, CA
- 2.0 2 km NW of The Geysers, CA
- 1.5 5 km NNW of The Geysers, CA
- 1.9 5 km NNW of The Geysers, CA
- 1.6 2 km SSW of Cobb, CA
- 2.0 4 km W of Cobb, CA
- 1.6 4 km ESE of Lower Lake, CA
- 1.8 4 km ESE of Lower Lake, CA
- 2.1 7 km NW of The Geysers, CA
- 1.5 8 km NW of The Geysers, CA
- 2.4 8 km W of Cobb, CA
- 2.1 1 km NNW of The Geysers, CA
- 1.6 6 km NW of The Geysers, CA
- 2.3 7 km WNW of Cobb, CA
- 1.6 2 km NW of The Geysers, 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.