M1.1 earthquake near South El Monte, California, United States
A magnitude 1.1 earthquake struck near South El Monte, California, United States at 03:21 local time (10:21 UTC) on 30 Oct 2026, at a depth of 11 km, according to USGS. The solution is preliminary and may be revised.
revised from M1.0
Data: USGS · updated 2026-10-30 10:25 UTC · automatic solution
- Magnitude
- 1.1micro
local magnitude (Richter) (ml)
revised from 1.0 - Depth
- 11.1 km
- Status
- Automatic
- Origin time
- 2026-10-30 10:21:45 UTC
- Local: 30 Oct 2026, 03:21:45 (America/Los Angeles)
- Epicentre
- 34.037° N, 118.031° 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 |
|---|---|---|
| South El MonteCalifornia, United States · pop. 20,878 | 2 km | INot felt |
| El MonteCalifornia, United States · pop. 116,732 | 4 km | INot felt |
| West Puente ValleyCalifornia, United States · pop. 22,636 | 6 km | INot felt |
| RosemeadCalifornia, United States · pop. 54,908 | 6 km | INot felt |
| Los AngelesCalifornia, United States · pop. 3,820,914 | 19 km | INot felt |
| AnaheimCalifornia, United States · pop. 350,742 | 25 km | INot felt |
| Long BeachCalifornia, United States · pop. 474,140 | 33 km | INot felt |
| Santa AnaCalifornia, United States · pop. 310,227 | 35 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 | 1.1 mlwas 1.0 | 11.1 km | 34.04° N, 118.03° W | – | Automatic · 1 revision |
How big was it?
Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.
It released roughly the energy of 697 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 11 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.
M1.1 releases about 1.5× the energy of M1.0, and its waves are about 1.3× taller on a seismogram. Energy: 697 g 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
15 later earthquakes within 30 km; the largest was M1.8 12 days ago. 11 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.
Mainshock M1.1
15 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).
| Time after mainshock (hours) | Magnitude | Depth (km) |
|---|---|---|
| 20.37 | 0.9 | 13 |
| 25.57 | 0.5 | 7 |
| 35.16 | 1.8 | 12 |
| 60.74 | 1.2 | 12 |
| 111.20 | 1.5 | 11 |
| 130.09 | 1.1 | -1 |
| 160.66 | 1.3 | 14 |
| 167.12 | 0.5 | 12 |
| 212.20 | 0.8 | 11 |
| 243.33 | 1.5 | 10 |
| 247.08 | 0.6 | 12 |
| 301.11 | 1.3 | 10 |
| 310.75 | 1.1 | 16 |
| 318.20 | 1.0 | 13 |
| 323.03 | 1.4 | 4 |
- 1.8Near West Rancho Dominguez, California, United States10-31 21:31
- 1.54 km NW of Signal Hill, California, United States11-09 13:41
- 1.5Near Placentia, California, United States11-04 01:33
- 1.4Near Azusa, California, United States11-12 21:23
- 1.33 km SW of Yorba Linda, California, United States11-11 23:28
- 1.3Near La Mirada, California, United States11-06 03:01
- 1.26 km NNW of Glendora, California, United States11-01 23:06
- 1.1Near Yorba Linda, California, United States11-12 09:06
- 1.16 km NNW of Azusa, California, United States11-04 20:26
- 1.0Near Charter Oak, California, United States11-12 16:33
- 0.94 km S of San Dimas, California, United States10-31 06:44
- 0.89 km NNW of Glendora, California, United States11-08 06:33
- 0.6Near Charter Oak, California, United States11-09 17:26
- 0.5Near El Monte, California, United States11-06 09:28
- 0.56 km N of Altadena, California, United States10-31 11:55
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 ci41569592. First recorded here 30 Oct 2026, 10:24:54 UTC. Solutions: USGS · CI (usgs:ci41569592). Cite as: SeismoAtlas, “M1.1 earthquake near South El Monte, California, United States”, https://seismoatlas.com/earthquake/ci41569592-m1-1-earthquake-near-south-el-monte-california-united-states, data from USGS.
JSON: /api/v1/events/ci41569592. SeismoAtlas is not an official warning service.