M0.5 earthquake 45 km W of Brawley, California, United States
A magnitude 0.5 earthquake struck 45 km W of Brawley, California, United States at 13:11 local time (20:11 UTC) on 31 Oct 2026, at a depth of 19 km, according to USGS. The solution is preliminary and may be revised.
Data: USGS · updated 2026-10-31 20:15 UTC · automatic solution
- Magnitude
- 0.5micro
local magnitude (Richter) (ml) - Depth
- 19.3 km
- Status
- Automatic
- Origin time
- 2026-10-31 20:11:41 UTC
- Local: 31 Oct 2026, 13:11:41 (America/Los Angeles)
- Epicentre
- 33.022° N, 116.013° 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 |
|---|---|---|
| BrawleyCalifornia, United States · pop. 25,897 | 45 km | INot felt |
| ImperialCalifornia, United States · pop. 17,095 | 46 km | INot felt |
| El CentroCalifornia, United States · pop. 43,956 | 50 km | INot felt |
| Santa IsabelBaja California, Mexico · pop. 29,311 | 60 km | INot felt |
| CalexicoCalifornia, United States · pop. 40,053 | 61 km | INot felt |
| MexicaliBaja California, Mexico · pop. 1,032,686 | 68 km | INot felt |
| Chula VistaCalifornia, United States · pop. 265,757 | 108 km | INot felt |
| TijuanaBaja California, Mexico · pop. 1,922,523 | 109 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.
| Agency | Magnitude | Depth | Epicentre | Time offset | Status |
|---|---|---|---|---|---|
| USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey | 0.5 ml | 19.3 km | 33.02° N, 116.01° W | – | Automatic |
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 79 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 19 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 6× the energy of M0.5, and its waves are about 3.3× taller on a seismogram. Energy: 477 g of TNT vs 79 g of TNT.
Each square is the energy of one M0.5. Energy from log₁₀E = 1.5M + 4.8.
Aftershocks and nearby activity
16 later earthquakes within 30 km; the largest was M1.9 6 days ago. 16 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M0.5
16 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 6.98 | 0.6 | 9 |
| 23.27 | 1.1 | 7 |
| 73.91 | 1.0 | 9 |
| 73.92 | 1.0 | 10 |
| 111.03 | 1.2 | 3 |
| 111.96 | 1.6 | 2 |
| 144.56 | 1.9 | 10 |
| 188.31 | 1.2 | 9 |
| 194.77 | 1.0 | 11 |
| 195.40 | 1.0 | 10 |
| 221.63 | 1.0 | 10 |
| 241.20 | 1.2 | 10 |
| 243.18 | 0.5 | 8 |
| 253.60 | 1.5 | 6 |
| 253.61 | 0.8 | 5 |
| 288.27 | 0.8 | 9 |
- 1.937 km W of Imperial, California, United States11-06 20:45
- 1.637 km WNW of Brawley, California, United States11-05 12:09
- 1.526 km S of Oasis, California, United States11-11 09:47
- 1.252 km ENE of Tecate, Baja California, Mexico11-10 21:23
- 1.237 km WNW of Brawley, California, United States11-05 11:13
- 1.223 km W of Brawley, California, United States11-08 16:30
- 1.130 km S of Oasis, California, United States11-01 19:27
- 1.052 km ENE of Tecate, Baja California, Mexico11-10 01:49
- 1.052 km ENE of Tecate, Baja California, Mexico11-08 22:58
- 1.052 km NE of Tecate, Baja California, Mexico11-08 23:35
- 1.028 km SSE of Oasis, California, United States11-03 22:06
- 1.027 km SSE of Oasis, California, United States11-03 22:07
- 0.825 km S of Oasis, California, United States11-11 09:48
- 0.844 km S of Oasis, California, United States11-12 20:27
- 0.632 km SSE of Oasis, California, United States11-01 03:10
- 0.522 km WNW of Imperial, California, United States11-10 23:22
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 ci41570496. First recorded here 31 Oct 2026, 20:16:19 UTC. Solutions: USGS · CI (usgs:ci41570496). Cite as: SeismoAtlas, “M0.5 earthquake 45 km W of Brawley, California, United States”, https://seismoatlas.com/earthquake/ci41570496-m0-5-earthquake-45-km-w-of-brawley-california-united-states, data from USGS.
JSON: /api/v1/events/ci41570496. SeismoAtlas is not an official warning service.