Earthquake · reviewed by a seismologist
M 4.2mw
Earthquake near Cloverdale, CA
No earthquake was likely felt in Cloverdale in the 24 hours to 8:55 am PST (16:55 UTC). The last one was M 2.6, 22 km (14 mi) E, at 4:44 pm PST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Cloverdale
This page: a magnitude 4.2 earthquake was recorded 8 km (5 mi) east-southeast of Cloverdale, CA, at 7:40 pm PDT on 28 July 2026 (02:40 UTC), 5.9 km deep. 240 people have reported feeling it to USGS.
USGS: 8 km ESE of Cloverdale, CA
42 km (26 mi) NNW of Santa Rosa, CA · 120 km (74 mi) NNW of San Francisco, CA
- When
- 7:40 pm PDT on 28 July 2026 ()
- Where
- 8 km (5 mi) east-southeast of Cloverdale, CA · earthquakes near Cloverdale
- Magnitude
- M 4.2 (mw)
- Depth
- 5.9 km below the surface
- Felt
- 240 reports · strongest reported intensity V
- Measured shaking
- intensity V (ShakeMap)
- USGS impact alert
- green
- Nearest
- Sonoma County, 28 km S
- Nearest mapped fault
- Maacama fault, 4 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 50 days ago
Earthquake alerts for Cloverdale, CA
Get a notification in this browser when USGS records an earthquake near Cloverdale, 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 116 km (72 mi) from the epicentre. In Cloverdale, 8 km away, the estimate is intensity IV (light). 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: Cloverdale 8 km, intensity IV · Cobb 19 km, intensity III · Healdsburg 19 km, intensity III · Windsor 28 km, intensity III · Lakeport 30 km, intensity III · Clearlake 34 km, intensity III · Calistoga 38 km, intensity III · Santa Rosa 42 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 35 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 4,900× the energy of this one
- Mineral, Virginia 2011 M 5.8 220× the energy of this one
- Magna, Utah 2020 M 5.7 150× the energy of this one
- This earthquake M 4.2 about 35 tons of TNT
- Around the size people start to feel M 3.0 this one released 72× more
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 14 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.2 6 km ESE of Talmage, California · 40 km NNW 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 38.7770, -122.9357. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 28 km (17 mi) | S | earthquakes near Sonoma County |
| Lake County, CA | 40 km (25 mi) | NNE | earthquakes near Lake County |
| Napa County, CA | 61 km (38 mi) | ESE | earthquakes near Napa County |
| Colusa County, CA | 75 km (47 mi) | NE | earthquakes near Colusa County |
| Marin County, CA | 82 km (51 mi) | SSE | earthquakes near Marin County |
| Mendocino County, CA | 85 km (53 mi) | NNW | earthquakes near Mendocino 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.
- 3.0 7 km NW of The Geysers, CA
- 2.4 6 km NW of The Geysers, CA
- 1.7 10 km WNW of Cobb, CA
- 2.6 2 km W of The Geysers, CA
- 1.5 7 km NW of The Geysers, CA
- 1.9 8 km ESE of Cloverdale, CA
- 2.1 7 km W of Kenwood, CA
- 1.5 12 km WNW of Cobb, CA
- 1.9 7 km ESE of Cloverdale, CA
- 1.7 9 km NNE of Larkfield-Wikiup, CA
- 1.6 7 km WNW of Cobb, CA
- 1.8 9 km WNW of Cobb, CA
- 1.5 1 km NNW of The Geysers, CA
- 1.6 5 km WNW of The Geysers, CA
- 1.5 6 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.