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M1.3 earthquake 6 km SSW of Los Serranos, California, United States

A magnitude 1.3 earthquake struck 6 km SSW of Los Serranos, California, United States at 05:03 local time (12:03 UTC) on 26 Sept 2026, at a depth of 5 km, according to USGS.

Data: USGS · updated 2026-09-28 13:54 UTC · reviewed

Magnitude
1.3micro
local magnitude (Richter) (ml)
Depth
5.5 km
Status
Reviewed
Origin time
2026-09-26 12:03:43 UTC
Local: 26 Sept 2026, 05:03:43 (America/Los Angeles)
Epicentre
33.927° N, 117.743° 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
Los SerranosCalifornia, United States · pop. 7,0996 kmINot felt
Chino HillsCalifornia, United States · pop. 78,3097 kmINot felt
Yorba LindaCalifornia, United States · pop. 67,9737 kmINot felt
ChinoCalifornia, United States · pop. 85,59510 kmINot felt
Diamond BarCalifornia, United States · pop. 56,89713 kmINot felt
AnaheimCalifornia, United States · pop. 350,74218 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22723 kmINot felt
IrvineCalifornia, United States · pop. 256,92729 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey1.3 ml5.5 km33.93° N, 117.74° W–Reviewed

How big was it?

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

It released roughly the energy of 2 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 5 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.3 releases about 3.2× the energy of M1.0, and its waves are about 2.2× taller on a seismogram. Energy: 2 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

30 later earthquakes within 30 km; the largest was M1.9 40 days ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
5.421.116
57.241.06
101.330.94
104.531.20
123.261.28
125.111.0-1
130.291.5-1
150.951.00
175.811.95
175.811.75
176.091.07
183.230.77
189.630.93
213.020.99
247.690.36
275.580.30
277.590.96
308.320.75
321.751.75
321.791.50
435.251.210
440.111.70
487.871.22
488.661.04
544.080.613
583.551.1-1
654.531.3-1
685.951.212
700.211.48
712.711.18
  1. 1.97 km NNW of Eastvale, California, United States10-03 19:52
  2. 1.76 km WNW of Jurupa Valley, California, United States10-03 19:52
  3. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  4. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  5. 1.5Near El Cerrito Corona, California, United States10-01 22:21
  6. 1.54 km ESE of El Cerrito Corona, California, United States10-09 21:51
  7. 1.46 km NW of Jurupa Valley, California, United States10-25 16:16
  8. 1.3Near El Cerrito Corona, California, United States10-23 18:35
  9. 1.2Near El Cerrito Corona, California, United States10-16 19:55
  10. 1.2Near Stanton, California, United States10-25 02:00
  11. 1.24 km SSW of Yorba Linda, California, United States10-14 15:18
  12. 1.2Near Home Gardens, California, United States09-30 20:35
  13. 1.25 km NNE of Rancho Cucamonga, California, United States10-01 15:19
  14. 1.1Near Home Gardens, California, United States10-20 19:36
  15. 1.14 km N of Jurupa Valley, California, United States09-26 17:29
  16. 1.1Near Anaheim, California, United States10-26 04:46
  17. 1.07 km SSW of El Cerrito Corona, California, United States09-28 21:18
  18. 1.011 km SW of Corona, California, United States10-16 20:43
  19. 1.04 km ESE of El Cerrito Corona, California, United States10-01 17:10
  20. 1.0Near Home Gardens, California, United States10-02 19:00
  21. 1.010 km SW of Corona, California, United States10-03 20:09
  22. 0.95 km W of Fontana, California, United States10-08 01:39
  23. 0.9Near Charter Oak, California, United States10-04 09:41
  24. 0.94 km SE of Yorba Linda, California, United States10-05 09:05
  25. 0.97 km NNW of Eastvale, California, United States09-30 17:23

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 ci41339455. First recorded here 28 Sept 2026, 17:32:09 UTC. Solutions: USGS · CI (usgs:ci41339455). Cite as: SeismoAtlas, “M1.3 earthquake 6 km SSW of Los Serranos, California, United States”, https://seismoatlas.com/earthquake/ci41339455-m1-3-earthquake-6-km-ssw-of-los-serranos-california-united-states, data from USGS.

JSON: /api/v1/events/ci41339455. SeismoAtlas is not an official warning service.