M1.0 earthquake 21 km ENE of Big Bear City, California, United States
A magnitude 1.0 earthquake struck 21 km ENE of Big Bear City, California, United States at 20:44 local time (03:44 UTC) on 31 Oct 2026, at a depth of 12 km, according to USGS.
revised from M1.2
Data: USGS · updated 2026-11-02 15:52 UTC · reviewed
- Magnitude
- 1.0micro
local magnitude (Richter) (ml)
revised from 1.2 - Depth
- 12.5 km
- Status
- Reviewed
- Origin time
- 2026-11-01 03:44:38 UTC
- Local: 31 Oct 2026, 20:44:38 (America/Los Angeles)
- Epicentre
- 34.348° N, 116.646° 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 |
|---|---|---|
| Big Bear CityCalifornia, United States · pop. 12,304 | 21 km | INot felt |
| Big Bear LakeCalifornia, United States · pop. 5,213 | 27 km | INot felt |
| Yucca ValleyCalifornia, United States · pop. 21,600 | 33 km | INot felt |
| Desert Hot SpringsCalifornia, United States · pop. 28,335 | 45 km | INot felt |
| YucaipaCalifornia, United States · pop. 53,328 | 51 km | INot felt |
| BanningCalifornia, United States · pop. 30,945 | 51 km | INot felt |
| RiversideCalifornia, United States · pop. 317,261 | 82 km | INot felt |
| AnaheimCalifornia, United States · pop. 350,742 | 129 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 · CI, which has been reviewed by an analyst.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey | 1.0 mlwas 1.2 | 12.5 km | 34.35° N, 116.65° W | – | Reviewed · 2 revisions |
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 461 g 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 12 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.0 releases about 1× the energy of M1.0, and its waves are about 1× taller on a seismogram. Energy: 477 g of TNT vs 461 g of TNT.
Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
7 later earthquakes within 30 km; the largest was M1.5 9 days ago. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M1.0
7 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 8.48 | 0.9 | 9 |
| 24.82 | 1.1 | 8 |
| 49.07 | 0.5 | 1 |
| 50.95 | 0.8 | 1 |
| 63.41 | 0.8 | 2 |
| 64.46 | 1.5 | 1 |
| 168.88 | 0.9 | 3 |
- 1.510 km ESE of Big Bear City, California, United States11-03 20:11
- 1.1Near Big Bear City, California, United States11-02 04:33
- 0.9Near Big Bear City, California, United States11-01 12:13
- 0.95 km N of Yucca Valley, California, United States11-08 04:37
- 0.821 km W of Yucca Valley, California, United States11-03 06:41
- 0.811 km ESE of Big Bear City, California, United States11-03 19:08
- 0.511 km ESE of Big Bear City, California, United States11-03 04:48
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 ci41570704. First recorded here 1 Nov 2026, 03:48:39 UTC. Solutions: USGS · CI (usgs:ci41570704). Cite as: SeismoAtlas, “M1.0 earthquake 21 km ENE of Big Bear City, California, United States”, https://seismoatlas.com/earthquake/ci41570704-m1-0-earthquake-21-km-ene-of-big-bear-city-california-united-states, data from USGS.
JSON: /api/v1/events/ci41570704. SeismoAtlas is not an official warning service.