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M0.8 earthquake near Fontana, California, United States

A magnitude 0.8 earthquake struck near Fontana, California, United States at 22:53 local time (05:53 UTC) on 29 Sept 2026, at a depth of 5 km, according to USGS.

revised from M1.1

Data: USGS · updated 2026-10-01 13:14 UTC · reviewed

Magnitude
0.8micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
5.2 km
Status
Reviewed
Origin time
2026-09-30 05:53:45 UTC
Local: 29 Sept 2026, 22:53:45 (America/Los Angeles)
Epicentre
34.105° N, 117.428° 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
FontanaCalifornia, United States · pop. 212,7042 kmINot felt
BloomingtonCalifornia, United States · pop. 23,8515 kmINot felt
RialtoCalifornia, United States · pop. 103,1325 kmINot felt
ColtonCalifornia, United States · pop. 54,62112 kmINot felt
RiversideCalifornia, United States · pop. 317,26117 kmINot felt
AnaheimCalifornia, United States · pop. 350,74253 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22757 kmINot felt
IrvineCalifornia, United States · pop. 256,92760 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 Survey0.8 mlwas 1.15.2 km34.10° N, 117.43° 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 274 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 5 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 1.7× the energy of M0.8, and its waves are about 1.4× taller on a seismogram. Energy: 477 g of TNT vs 274 g of TNT.

Each square is the energy of one M0.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

167 later earthquakes within 30 km; the largest was M2.7 35 days ago. 20 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
8.091.616
11.490.94
14.691.20
15.950.913
25.791.017
28.382.110
33.421.28
61.121.00
77.090.710
85.971.75
85.971.95
90.110.87
93.400.77
111.200.85
112.071.015
119.521.517
120.451.017
124.831.44
124.880.73
125.280.84
125.781.24
125.951.44
126.030.94
155.661.116
160.281.011
162.792.19
168.820.817
170.520.616
172.011.216
172.290.73
174.750.69
181.871.416
187.750.96
188.511.57
188.731.16
192.020.96
193.870.916
193.960.97
194.251.47
194.252.76
194.521.16
196.141.07
196.361.27
196.690.77
196.770.87
196.770.97
196.921.27
197.910.47
197.971.05
198.520.67
200.611.16
201.500.76
201.931.816
202.570.55
202.610.97
202.770.87
215.531.217
218.490.75
220.470.87
221.331.78
231.921.75
234.960.911
240.411.014
241.020.85
248.240.914
251.951.516
261.521.014
265.351.115
285.211.13
295.020.918
296.870.914
306.171.54
306.410.415
337.931.715
346.611.04
350.281.70
356.640.615
364.661.03
380.760.818
398.031.22
401.991.56
412.060.75
428.891.04
433.770.912
434.300.712
445.771.615
449.700.916
456.722.416
465.501.317
465.571.317
493.491.06
493.711.1-1
500.660.77
515.441.015
526.231.37
529.360.94
529.821.04
530.231.34
531.690.95
531.960.95
532.631.213
550.170.53
551.061.84
551.080.96
551.941.05
551.941.55
552.750.715
554.511.34
555.702.07
555.731.67
555.741.37
556.710.87
564.691.3-1
583.470.99
591.211.13
592.740.71
593.260.89
596.750.78
602.210.811
606.620.611
610.381.48
621.581.012
625.270.612
631.391.67
633.771.06
638.831.02
639.161.4-1
641.280.97
642.650.813
642.651.011
644.660.77
648.951.012
662.150.90
667.741.213
682.521.14
682.751.26
683.551.34
683.610.85
685.211.15
685.761.15
685.801.85
685.921.14
688.520.85
688.831.07
688.851.34
689.052.05
689.361.0-1
689.531.33
692.390.614
692.460.94
692.671.14
693.290.84
694.820.83
708.611.40
711.320.94
716.182.24
716.310.94
716.551.37
717.362.26
717.371.37
717.381.04
717.410.94
717.790.94
717.791.23
719.081.36
719.081.87
719.820.65
  1. 2.74 km WNW of Fontana, California, United States10-08 08:09
  2. 2.4Near Loma Linda, California, United States10-19 06:36
  3. 2.2Near Loma Linda, California, United States10-30 02:04
  4. 2.2Near Loma Linda, California, United States10-30 03:15
  5. 2.15 km NNW of Fontana, California, United States10-07 00:41
  6. 2.112 km NW of Muscoy, California, United States10-01 10:16
  7. 2.04 km WNW of Fontana, California, United States10-23 09:35
  8. 2.0Near Loma Linda, California, United States10-28 22:56
  9. 1.97 km NNW of Eastvale, California, United States10-03 19:52
  10. 1.8Near Loma Linda, California, United States10-28 19:41
  11. 1.8Near Loma Linda, California, United States10-30 04:58
  12. 1.8Near Colton, California, United States10-08 15:49
  13. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  14. 1.76 km WNW of Jurupa Valley, California, United States10-03 19:52
  15. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  16. 1.7Near Redlands, California, United States10-14 07:49
  17. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  18. 1.714 km NNE of Rancho Cucamonga, California, United States10-09 11:13
  19. 1.64 km W of Fontana, California, United States10-26 13:17
  20. 1.63 km SE of Loma Linda, California, United States09-30 13:59
  21. 1.64 km WNW of Fontana, California, United States10-23 09:37
  22. 1.6Near Loma Linda, California, United States10-18 19:39
  23. 1.5Near Colton, California, United States10-10 17:50
  24. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  25. 1.5Near Fontana, California, United States10-13 00:04

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 ci41340871. First recorded here 30 Sept 2026, 05:56:26 UTC. Solutions: USGS · CI (usgs:ci41340871). Cite as: SeismoAtlas, “M0.8 earthquake near Fontana, California, United States”, https://seismoatlas.com/earthquake/ci41340871-m0-8-earthquake-near-fontana-california-united-states, data from USGS.

JSON: /api/v1/events/ci41340871. SeismoAtlas is not an official warning service.