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M1.5 earthquake near Fontana, California, United States

A magnitude 1.5 earthquake struck near Fontana, California, United States at 17:04 local time (00:04 UTC) on 12 Oct 2026, at a depth of 4 km, according to USGS.

revised from M1.7

Data: USGS · updated 2026-10-13 14:49 UTC · reviewed

Magnitude
1.5micro
local magnitude (Richter) (ml)
revised from 1.7
Depth
3.8 km
Status
Reviewed
Origin time
2026-10-13 00:04:08 UTC
Local: 12 Oct 2026, 17:04:08 (America/Los Angeles)
Epicentre
34.071° N, 117.457° 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. 212,7043 kmIIWeak
BloomingtonCalifornia, United States · pop. 23,8515 kmIIWeak
Glen AvonCalifornia, United States · pop. 20,1997 kmINot felt
RubidouxCalifornia, United States · pop. 34,2809 kmINot felt
RiversideCalifornia, United States · pop. 317,26114 kmINot felt
AnaheimCalifornia, United States · pop. 350,74249 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22752 kmINot felt
IrvineCalifornia, United States · pop. 256,92756 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 Survey1.5 mlwas 1.63.8 km34.07° N, 117.46° 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 3 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 4 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.5 releases about 6.2× the energy of M1.0, and its waves are about 3.4× taller on a seismogram. Energy: 3 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

157 later earthquakes within 30 km; the largest was M2.4 24 days ago. 49 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.240.415
31.761.715
40.441.04
44.101.70
50.470.615
58.491.03
74.590.818
91.861.22
95.821.56
105.890.75
122.721.04
127.600.912
128.130.712
139.591.615
143.520.916
150.542.416
159.331.317
159.391.317
187.321.06
187.541.1-1
194.490.77
209.261.015
220.051.37
223.190.94
223.651.04
224.061.34
225.520.95
225.790.95
226.451.213
244.000.53
244.881.84
244.910.96
245.771.05
245.771.55
246.580.715
248.341.34
249.532.07
249.561.67
249.571.37
250.540.87
258.521.3-1
277.300.99
285.031.13
286.560.71
287.080.89
290.580.78
296.040.811
300.440.611
304.211.48
315.411.012
319.100.612
325.221.67
327.601.06
332.661.02
332.981.4-1
335.110.97
336.480.813
336.481.011
338.490.77
342.781.012
352.210.98
355.980.90
361.561.213
376.341.14
376.581.26
377.381.34
377.440.85
379.041.15
379.581.15
379.621.85
379.751.14
382.350.85
382.661.07
382.671.34
382.882.05
383.181.0-1
383.361.33
386.220.614
386.290.94
386.501.14
387.110.84
388.640.83
402.441.40
405.150.94
410.002.24
410.140.94
410.371.37
411.192.26
411.201.37
411.211.04
411.230.94
411.620.94
411.621.23
412.911.36
412.911.87
413.640.65
413.910.73
414.010.68
414.970.54
415.300.96
415.311.06
415.310.74
416.300.84
416.541.24
416.680.93
416.900.75
416.910.75
416.950.54
417.350.96
417.361.65
417.411.06
418.500.85
420.240.74
420.241.14
424.561.010
426.960.90
428.070.97
431.191.04
433.700.94
433.911.14
440.190.613
440.821.09
444.470.76
444.781.25
444.800.95
449.602.16
454.011.111
457.561.04
458.810.65
466.960.316
467.890.75
481.491.19
534.750.713
534.790.714
543.861.24
549.451.10
559.250.716
571.461.80
578.690.914
578.700.413
583.140.617
584.191.04
584.551.113
590.980.97
596.261.2-1
597.631.40
597.731.316
597.901.60
604.981.513
606.951.017
607.771.016
609.301.16
609.330.915
639.571.011
652.810.87
679.031.113
691.581.08
  1. 2.4Near Loma Linda, California, United States10-19 06:36
  2. 2.2Near Loma Linda, California, United States10-30 02:04
  3. 2.2Near Loma Linda, California, United States10-30 03:15
  4. 2.1Near Loma Linda, California, United States10-31 17:40
  5. 2.04 km WNW of Fontana, California, United States10-23 09:35
  6. 2.0Near Loma Linda, California, United States10-28 22:56
  7. 1.8Near Loma Linda, California, United States10-28 19:41
  8. 1.8Near Loma Linda, California, United States10-30 04:58
  9. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  10. 1.8Near El Cerrito Corona, California, United States11-05 19:31
  11. 1.7Near Redlands, California, United States10-14 07:49
  12. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  13. 1.64 km W of Fontana, California, United States10-26 13:17
  14. 1.6Near Loma Linda, California, United States10-30 09:25
  15. 1.64 km ESE of El Cerrito Corona, California, United States11-06 21:57
  16. 1.64 km WNW of Fontana, California, United States10-23 09:37
  17. 1.6Near Loma Linda, California, United States10-18 19:39
  18. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  19. 1.5Near Loma Linda, California, United States11-07 05:02
  20. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  21. 1.4Near El Cerrito Corona, California, United States10-29 18:30
  22. 1.43 km ENE of El Cerrito Corona, California, United States10-26 21:03
  23. 1.46 km NW of Jurupa Valley, California, United States10-25 16:16
  24. 1.4Near Home Gardens, California, United States11-06 21:41
  25. 1.3Near Loma Linda, California, United States10-19 15:27

Did you feel it?

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Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id ci41346927. First recorded here 13 Oct 2026, 00:06:49 UTC. Solutions: USGS · CI (usgs:ci41346927). Cite as: SeismoAtlas, “M1.5 earthquake near Fontana, California, United States”, https://seismoatlas.com/earthquake/ci41346927-m1-5-earthquake-near-fontana-california-united-states, data from USGS.

JSON: /api/v1/events/ci41346927. SeismoAtlas is not an official warning service.