Earthquake · automatic estimate, may change
M 2.7md
Earthquake near Santa Rosa, CA
No earthquake was likely felt in Santa Rosa in the 24 hours to 3:29 pm PST (23:29 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 2.7 earthquake was recorded 4 km (2 mi) east-southeast of Santa Rosa, CA, at 6:40 pm PDT on 15 September 2026 (01:40 UTC), 9.1 km deep. 171 people have reported feeling it to USGS. The magnitude and location are an automatic first estimate and may change.
USGS: 3 km ESE of Santa Rosa, CA
in Santa Rosa, CA
- When
- 6:40 pm PDT on 15 September 2026 ()
- Where
- 4 km (2 mi) east-southeast of Santa Rosa, CA · earthquakes near Santa Rosa
- Magnitude
- M 2.7 (md)
- Depth
- 9.1 km below the surface
- Felt
- 171 reports · strongest reported intensity III
- Nearest
- Sonoma County, 24 km WNW
- Nearest mapped fault
- Rodgers Creek 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 53 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 23 km (14 mi) from the epicentre. In Santa Rosa, 4 km away, the estimate is intensity III (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: Santa Rosa 4 km, intensity III · Rohnert Park 11 km, intensity II · Kenwood 11 km, intensity II · Windsor 18 km, intensity II · Calistoga 18 km, intensity II · Agua Caliente 20 km, intensity II · Petaluma 23 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 310 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 50,000× the energy of this one
- Magna, Utah 2020 M 5.7 35,000× the energy of this one
- Around the size people start to feel M 3.0 3.1× the energy of this one
- This earthquake M 2.7 about 310 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 3,200 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 · 40 km SE of this epicentre
- 5.3 3 km E of Bloomfield, California · 18 km SW of this epicentre
- 5.3 Northern California · 18 km SW 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 38.4332, -122.6718. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 24 km (15 mi) | WNW | earthquakes near Sonoma County |
| Napa County, CA | 31 km (19 mi) | ENE | earthquakes near Napa County |
| Marin County, CA | 43 km (27 mi) | S | earthquakes near Marin County |
| Solano County, CA | 66 km (41 mi) | ESE | earthquakes near Solano County |
| Yolo County, CA | 72 km (45 mi) | ENE | earthquakes near Yolo County |
| Lake County, CA | 75 km (47 mi) | N | earthquakes near Lake County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 0.7 8 km W of Cobb, CA
- 1.4 3 km SW of American Canyon, CA
- 1.1 6 km WNW of Cobb, CA
- 0.8 2 km NW of The Geysers, CA
- 2.1 5 km WNW of The Geysers, CA
- 1.3 5 km WNW of The Geysers, CA
- 0.9 4 km WNW of The Geysers, CA
- 1.1 5 km NW of The Geysers, CA
- 0.8 5 km NW of The Geysers, CA
- 1.1 8 km NW of The Geysers, CA
- 0.7 8 km WNW of The Geysers, CA
- 0.7 8 km NW of The Geysers, CA
- 0.7 13 km ENE of Cloverdale, CA
- 1.0 3 km NNW of The Geysers, CA
- 0.8 5 km WNW 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.