Earthquake · reviewed by a seismologist
M 3.6mw
Earthquake near Ukiah, CA
Yes: an earthquake was likely felt in Ukiah in the last 24 hours. M 1.5, 5 km (3 mi) E of Ukiah, at 3:26 am PST on 12 November 2026 (11:26 UTC); the estimated shaking in Ukiah was intensity II (weak). Every earthquake near Ukiah
This page: a magnitude 3.6 earthquake was recorded 49 km (30 mi) southwest of Ukiah, CA, at 4:13 pm PDT on 1 May 2023 (23:13 UTC), 9.1 km deep. 122 people have reported feeling it to USGS.
USGS: 4km SE of Point Arena, CA
96 km (60 mi) WNW of Santa Rosa, CA
- When
- 4:13 pm PDT on 1 May 2023 ()
- Where
- 49 km (30 mi) southwest of Ukiah, CA · earthquakes near Ukiah
- Magnitude
- M 3.6 (mw)
- Depth
- 9.1 km below the surface
- Felt
- 122 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Mendocino County, 63 km NNE
- Nearest mapped fault
- San Andreas 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 924 days ago
Earthquake alerts for Ukiah, CA
Get a notification in this browser when USGS records an earthquake near Ukiah, 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 70 km (43 mi) from the epicentre. In Ukiah, 49 km away, the estimate is intensity II (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: Boonville 29 km, intensity III · Ukiah 49 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 4.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 42,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,900× the energy of this one
- Magna, Utah 2020 M 5.7 1,300× the energy of this one
- This earthquake M 3.6 about 4.1 tons of TNT
- Around the size people start to feel M 3.0 this one released 8.5× 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 38.8905, -123.6595. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 63 km (39 mi) | NNE | earthquakes near Mendocino County |
| Sonoma County, CA | 75 km (47 mi) | ESE | earthquakes near Sonoma County |
| Lake County, CA | 83 km (51 mi) | ENE | earthquakes near Lake County |
| Marin County, CA | 123 km (76 mi) | SE | earthquakes near Marin County |
| Napa County, CA | 123 km (77 mi) | ESE | earthquakes near Napa County |
| Glenn County, CA | 134 km (83 mi) | NE | earthquakes near Glenn County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 1.9 5 km E of Boonville, CA
- 2.8 5 km E of Boonville, CA
- 1.6 14 km SE of Boonville, CA
- 1.6 5 km ESE of Point Arena, CA
- 1.9 4 km NE of Boonville, CA
- 1.5 4 km NE of Boonville, CA
- 1.6 22 km E of Navarro Head, CA
- 1.7 13 km NW of Fort Ross, CA
- 1.8 14 km NW of Fort Ross, CA
- 1.6 14 km NW of Fort Ross, CA
- 1.6 13 km NW of Fort Ross, CA
- 1.6 15 km ESE of Navarro Head, CA
- 2.0 12 km E of Navarro Head, CA
- 1.6 10 km S of Boonville, CA
- 1.7 11 km SE of Point Arena, 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.