Earthquake · reviewed by a seismologist
M 2.9md
Earthquake near Kenwood, CA
No earthquake was likely felt in Kenwood in the 24 hours to 3:06 am PST (11:06 UTC). The last one was M 1.7, in Kenwood, at 12:33 am PDT on 25 October 2026, estimated intensity II (weak) in town. Every earthquake near Kenwood
This page: a magnitude 2.9 earthquake was recorded 6 km (4 mi) west of Kenwood, CA, at 8:16 pm PDT on 9 October 2017 (03:16 UTC), 5.9 km deep. 222 people have reported feeling it to USGS.
USGS: 6 km W of Kenwood, California
8 km (5 mi) ESE of Santa Rosa, CA
- When
- 8:16 pm PDT on 9 October 2017 ()
- Where
- 6 km (4 mi) west of Kenwood, CA · earthquakes near Kenwood
- Magnitude
- M 2.9 (md)
- Depth
- 5.9 km below the surface
- Felt
- 222 reports · strongest reported intensity III
- Nearest
- Napa County, 28 km ENE
- Nearest mapped fault
- Bennett Valley fault, under 1 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 3315 days ago
Earthquake alerts for Kenwood, CA
Get a notification in this browser when USGS records an earthquake near Kenwood, CA. No account or email needed.
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 32 km (20 mi) from the epicentre. In Kenwood, 6 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: Kenwood 6 km, intensity III · Santa Rosa 9 km, intensity III · Rohnert Park 11 km, intensity III · Agua Caliente 15 km, intensity III · Calistoga 19 km, intensity II · Petaluma 20 km, intensity II · Windsor 23 km, intensity II · Angwin 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 720 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 21,000× the energy of this one
- Magna, Utah 2020 M 5.7 15,000× the energy of this one
- Around the size people start to feel M 3.0 1.3× the energy of this one
- This earthquake M 2.9 about 720 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 1,400 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 · 35 km SE of this epicentre
- 5.3 3 km E of Bloomfield, California · 20 km WSW of this epicentre
- 5.3 Northern California · 21 km WSW 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 38.4133, -122.6188. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 28 km (17 mi) | ENE | earthquakes near Napa County |
| Sonoma County, CA | 30 km (18 mi) | WNW | earthquakes near Sonoma County |
| Marin County, CA | 42 km (26 mi) | SSW | earthquakes near Marin County |
| Solano County, CA | 61 km (38 mi) | ESE | earthquakes near Solano County |
| Yolo County, CA | 69 km (43 mi) | ENE | earthquakes near Yolo County |
| Lake County, CA | 78 km (48 mi) | N | earthquakes near Lake County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.6 7 km NE of Rohnert Park, California
- 1.6 12 km ESE of Hidden Valley Lake, California
- 1.8 6 km S of Cobb, California
- 1.9 6 km W of Cobb, California
- 1.8 6 km W of Cobb, California
- 1.8 8 km W of Cobb, California
- 1.9 7 km W of Cobb, California
- 1.8 8 km W of Cobb, California
- 1.9 4 km WSW of Cobb, California
- 1.5 5 km WSW of Cobb, California
- 2.9 3 km SSW of Cobb, California
- 2.0 6 km E of Geyserville, California
- 2.1 6 km E of Geyserville, California
- 1.6 8 km WSW of Cobb, California
- 1.6 7 km W of Cobb, California
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.