Earthquake · reviewed by a seismologist
M 3.3mw
Earthquake near Cloverdale, CA
No earthquake was likely felt in Cloverdale in the 24 hours to 5:55 pm PST (01:55 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 3.3 earthquake was recorded 11 km (7 mi) north of Cloverdale, CA, at 11:21 am PDT on 29 May 2017 (18:21 UTC), 4.2 km deep. 43 people have reported feeling it to USGS.
USGS: 10 km N of Cloverdale, California
57 km (35 mi) NNW of Santa Rosa, CA · 135 km (84 mi) NNW of San Francisco, CA
- When
- 11:21 am PDT on 29 May 2017 ()
- Where
- 11 km (7 mi) north of Cloverdale, CA · earthquakes near Cloverdale
- Magnitude
- M 3.3 (mw)
- Depth
- 4.2 km below the surface
- Felt
- 43 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Lake County, 32 km NE
- 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 3376 days ago
Earthquake alerts for Cloverdale, 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 50 km (31 mi) from the epicentre. In Cloverdale, 11 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: Cloverdale 11 km, intensity III · Lakeport 17 km, intensity III · Cobb 26 km, intensity II · Upper Lake 30 km, intensity II · Ukiah 33 km, intensity II · Clearlake 33 km, intensity II · Boonville 34 km, intensity II · Healdsburg 34 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 140,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
- Magna, Utah 2020 M 5.7 4,600× the energy of this one
- This earthquake M 3.3 about 1.2 tons of TNT
- Around the size people start to feel M 3.0 this one released 2.5× 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 420 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 · 25 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 38.9013, -123.0018. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, CA | 32 km (20 mi) | NE | earthquakes near Lake County |
| Sonoma County, CA | 42 km (26 mi) | S | earthquakes near Sonoma County |
| Mendocino County, CA | 70 km (44 mi) | NNW | earthquakes near Mendocino County |
| Colusa County, CA | 73 km (45 mi) | ENE | earthquakes near Colusa County |
| Napa County, CA | 73 km (45 mi) | SE | earthquakes near Napa County |
| Glenn County, CA | 94 km (58 mi) | NNE | earthquakes near Glenn County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.7 9 km WNW of Cobb, California
- 2.4 9 km WNW of Cobb, California
- 2.4 4 km WSW of Cobb, California
- 1.5 8 km WSW of Cobb, California
- 1.8 6 km W of Cobb, California
- 2.1 5 km SW of Cobb, California
- 1.5 8 km WSW of Cobb, California
- 1.5 4 km SSW of Cobb, CA
- 1.6 8 km W of Cobb, California
- 1.9 Northern California
- 1.9 4 km N of Healdsburg, California
- 1.6 8 km S of Cobb, California
- 1.8 8 km W of Cobb, California
- 1.9 8 km W of Cobb, California
- 1.5 17 km NE of Upper Lake, 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.