M1.8 earthquake 24 km N of Ukiah, California, United States
A magnitude 1.8 earthquake struck 24 km N of Ukiah, California, United States at 17:35 local time (01:35 UTC) on 1 Nov 2026, at a depth of 8 km, according to USGS. The solution is preliminary and may be revised.
Data: USGS · updated 2026-11-02 01:37 UTC · automatic solution
- Magnitude
- 1.8micro
duration magnitude (md) - Depth
- 8.1 km
- Status
- Automatic
- Origin time
- 2026-11-02 01:35:39 UTC
- Local: 1 Nov 2026, 17:35:39 (America/Los Angeles)
- Epicentre
- 39.367° N, 123.214° W
Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map
Nearby places
| Place | Distance | Est. shaking |
|---|---|---|
| UkiahCalifornia, United States · pop. 15,917 | 24 km | INot felt |
| Fort BraggCalifornia, United States · pop. 7,289 | 52 km | INot felt |
| WindsorCalifornia, United States · pop. 27,464 | 97 km | INot felt |
| Santa RosaCalifornia, United States · pop. 178,127 | 112 km | INot felt |
| Rohnert ParkCalifornia, United States · pop. 42,407 | 123 km | INot felt |
| ChicoCalifornia, United States · pop. 121,345 | 125 km | INot felt |
| SacramentoCalifornia, United States · pop. 524,943 | 173 km | INot felt |
| San FranciscoCalifornia, United States · pop. 827,526 | 191 km | INot felt |
Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.
Every agency's solution
Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · NC.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · NCheadlineNorthern California Seismic System via U.S. Geological Survey | 1.8 md | 8.1 km | 39.37° N, 123.21° W | – | Automatic |
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 8 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 8 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.8 releases about 16× the energy of M1.0, and its waves are about 6.5× taller on a seismogram. Energy: 8 kg of TNT vs 477 g of TNT.
Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
10 later earthquakes within 30 km; the largest was M2.5 7 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M1.8
10 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 28.92 | 1.5 | 2 |
| 79.43 | 2.5 | 10 |
| 89.01 | 1.8 | 0 |
| 107.60 | 1.4 | 5 |
| 202.93 | 1.6 | 2 |
| 209.14 | 1.4 | 9 |
| 216.05 | 1.4 | 1 |
| 220.80 | 1.8 | 8 |
| 234.93 | 1.5 | -1 |
| 249.84 | 1.5 | 5 |
- 2.544 km NNE of Ukiah, California, United States11-05 09:01
- 1.822 km N of Ukiah, California, United States11-11 06:23
- 1.819 km E of Ukiah, California, United States11-05 18:36
- 1.618 km E of Ukiah, California, United States11-10 12:31
- 1.56 km E of Ukiah, California, United States11-12 11:26
- 1.510 km NE of Ukiah, California, United States11-11 20:31
- 1.526 km N of Ukiah, California, United States11-03 06:30
- 1.410 km NNE of Ukiah, California, United States11-11 01:38
- 1.420 km NNW of Ukiah, California, United States11-06 13:11
- 1.424 km N of Ukiah, California, United States11-10 18:44
Did you feel it?
Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.
Reports on SeismoAtlas
No reports yet.
Event id nc75461132. First recorded here 2 Nov 2026, 01:38:36 UTC. Solutions: USGS · NC (usgs:nc75461132). Cite as: SeismoAtlas, “M1.8 earthquake 24 km N of Ukiah, California, United States”, https://seismoatlas.com/earthquake/nc75461132-m1-8-earthquake-24-km-n-of-ukiah-california-united-states, data from USGS.
JSON: /api/v1/events/nc75461132. SeismoAtlas is not an official warning service.