Skip to content
SeismoAtlas

M1.1 earthquake near El Cerrito Corona, California, United States

A magnitude 1.1 earthquake struck near El Cerrito Corona, California, United States at 15:08 local time (22:08 UTC) on 23 Sept 2026, at a depth of 2 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-23 22:12 UTC · automatic solution

Magnitude
1.1micro
local magnitude (Richter) (ml)
Depth
2.4 km
Status
Automatic
Origin time
2026-09-23 22:08:48 UTC
Local: 23 Sept 2026, 15:08:48 (America/Los Angeles)
Epicentre
33.842° N, 117.493° 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

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
El Cerrito CoronaCalifornia, United States · pop. 5,1003 kmIIWeak
Home GardensCalifornia, United States · pop. 11,5705 kmINot felt
CoronaCalifornia, United States · pop. 164,2268 kmINot felt
NorcoCalifornia, United States · pop. 26,28911 kmINot felt
EastvaleCalifornia, United States · pop. 59,03915 kmINot felt
RiversideCalifornia, United States · pop. 317,26115 kmINot felt
IrvineCalifornia, United States · pop. 256,92736 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22736 kmINot 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey1.1 ml2.4 km33.84° N, 117.49° W–Automatic

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 587 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 2 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 1.2× the energy of M1.0, and its waves are about 1.1× taller on a seismogram. Energy: 587 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

66 later earthquakes within 30 km; the largest was M2.7 35 days ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.1

66 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
9.080.97
20.741.42
21.930.9-1
43.761.33
45.140.9-1
50.281.311
55.631.36
61.921.35
67.341.116
88.830.811
89.611.011
119.151.06
151.750.85
163.240.94
166.441.20
187.031.0-1
192.211.5-1
212.871.00
237.721.95
237.721.75
238.011.07
274.940.99
309.610.36
320.570.817
337.500.30
339.500.96
340.261.57
340.481.16
343.770.96
345.710.97
346.001.47
346.002.76
346.271.16
347.891.07
348.101.27
348.440.77
348.520.87
348.520.97
348.671.27
349.711.05
352.351.16
353.250.76
354.320.55
354.360.97
354.520.87
370.240.75
372.220.87
383.671.75
383.711.50
436.961.13
457.921.54
498.361.04
502.031.70
549.781.22
550.581.04
585.520.912
586.050.712
608.360.210
645.461.1-1
669.101.12
693.991.10
707.452.07
707.481.67
707.491.37
708.460.87
716.441.3-1
  1. 2.74 km WNW of Fontana, California, United States10-08 08:09
  2. 2.04 km WNW of Fontana, California, United States10-23 09:35
  3. 1.97 km NNW of Eastvale, California, United States10-03 19:52
  4. 1.76 km WNW of Jurupa Valley, California, United States10-03 19:52
  5. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  6. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  7. 1.64 km WNW of Fontana, California, United States10-23 09:37
  8. 1.5Near Fontana, California, United States10-13 00:04
  9. 1.54 km WNW of Fontana, California, United States10-08 02:24
  10. 1.5Near El Cerrito Corona, California, United States10-01 22:21
  11. 1.54 km ESE of El Cerrito Corona, California, United States10-09 21:51
  12. 1.45 km NNW of Lake Elsinore, California, United States09-24 18:53
  13. 1.45 km W of Fontana, California, United States10-08 08:08
  14. 1.36 km SSW of Los Serranos, California, United States09-26 12:03
  15. 1.310 km ENE of North Tustin, California, United States09-25 17:54
  16. 1.39 km E of Yorba Linda, California, United States09-26 00:25
  17. 1.3Near El Cerrito Corona, California, United States10-23 18:35
  18. 1.3Near Fontana, California, United States09-26 05:46
  19. 1.34 km WNW of Fontana, California, United States10-23 09:38
  20. 1.2Near El Cerrito Corona, California, United States10-16 19:55
  21. 1.24 km W of Fontana, California, United States10-08 10:15
  22. 1.2Near Home Gardens, California, United States09-30 20:35
  23. 1.24 km WNW of Fontana, California, United States10-08 10:49
  24. 1.1Near Fontana, California, United States10-12 03:06
  25. 1.1Near Home Gardens, California, United States10-20 19:36

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id ci41338047. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · CI (usgs:ci41338047). Cite as: SeismoAtlas, “M1.1 earthquake near El Cerrito Corona, California, United States”, https://seismoatlas.com/earthquake/ci41338047-m1-1-earthquake-near-el-cerrito-corona-california-united-states, data from USGS.

JSON: /api/v1/events/ci41338047. SeismoAtlas is not an official warning service.