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M1.2 earthquake near Colton, California, United States

A magnitude 1.2 earthquake struck near Colton, California, United States at 02:54 local time (09:54 UTC) on 7 Oct 2026, at a depth of 16 km, according to USGS.

revised from M1.3

Data: USGS · updated 2026-10-07 14:31 UTC · reviewed

Magnitude
1.2micro
local magnitude (Richter) (ml)
revised from 1.3
Depth
15.9 km
Status
Reviewed
Origin time
2026-10-07 09:54:07 UTC
Local: 7 Oct 2026, 02:54:07 (America/Los Angeles)
Epicentre
34.085° N, 117.297° 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
ColtonCalifornia, United States · pop. 54,6212 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1083 kmINot felt
Loma LindaCalifornia, United States · pop. 24,0455 kmINot felt
RialtoCalifornia, United States · pop. 103,1327 kmINot felt
RiversideCalifornia, United States · pop. 317,26118 kmINot felt
AnaheimCalifornia, United States · pop. 350,74263 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22765 kmINot felt
IrvineCalifornia, United States · pop. 256,92767 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 Survey1.2 mlwas 1.315.9 km34.09° N, 117.30° 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 919 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 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.2 releases about 1.9× the energy of M1.0, and its waves are about 1.5× taller on a seismogram. Energy: 919 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

187 later earthquakes within 30 km; the largest was M2.7 35 days ago. 26 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.2

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.280.73
9.861.416
15.750.96
16.501.57
16.721.16
20.010.96
21.870.916
21.960.97
22.251.47
22.252.76
22.511.16
24.131.07
24.351.27
24.680.77
24.770.87
24.770.97
24.921.27
25.910.47
25.961.05
26.510.67
28.601.16
29.500.76
29.921.816
30.560.55
30.600.97
30.760.87
43.531.217
46.480.75
48.460.87
49.331.78
59.911.75
62.950.911
68.081.918
68.401.014
69.020.85
76.230.914
79.941.516
89.521.014
93.341.115
113.201.13
123.010.918
124.860.914
134.171.54
134.400.415
165.921.715
174.601.04
184.630.615
192.661.03
208.750.818
215.002.417
229.991.56
240.050.75
256.881.04
261.770.912
262.290.712
273.761.615
277.690.916
284.712.416
293.501.317
293.561.317
321.451.014
321.491.06
328.650.77
330.461.117
343.431.015
354.221.37
357.350.94
357.821.04
358.221.34
359.680.95
359.960.95
360.621.213
367.721.114
378.160.53
379.051.84
379.070.96
379.941.05
379.941.55
380.740.715
382.501.34
383.692.07
383.731.67
383.741.37
384.710.87
411.470.99
419.201.13
420.730.71
421.250.89
423.881.613
424.750.78
430.210.811
434.610.611
438.371.48
449.581.012
453.260.612
459.391.67
459.790.68
461.771.06
466.831.02
469.280.97
470.650.813
470.651.011
472.650.77
473.870.92
476.951.012
495.731.213
505.760.36
510.511.14
510.751.26
511.551.34
511.600.85
513.201.15
513.751.15
513.791.85
513.921.14
516.520.85
516.831.07
516.841.34
517.042.05
517.351.0-1
517.531.33
520.390.614
520.450.94
520.661.14
521.280.84
522.810.83
539.320.94
544.172.24
544.310.94
544.541.37
545.362.26
545.371.37
545.381.04
545.400.94
545.780.94
545.791.23
547.071.36
547.081.87
547.810.65
548.080.73
548.170.68
549.130.54
549.470.96
549.471.06
549.480.74
550.460.84
550.711.24
550.850.93
551.070.75
551.080.75
551.110.54
551.520.96
551.531.65
551.581.06
552.670.85
554.400.74
554.411.14
558.731.010
562.240.97
565.361.04
567.870.94
568.081.14
574.350.613
574.981.09
578.630.76
578.941.25
578.970.95
583.772.16
588.181.111
591.731.04
592.980.65
601.120.316
602.060.75
615.661.19
635.911.113
644.652.014
644.760.612
668.910.713
668.960.714
674.880.817
678.031.24
693.420.716
712.860.914
712.870.413
717.310.617
718.361.04
718.711.113
  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. 2.43 km NW of Calimesa, California, United States10-16 08:53
  4. 2.2Near Loma Linda, California, United States10-30 02:04
  5. 2.2Near Loma Linda, California, United States10-30 03:15
  6. 2.1Near Loma Linda, California, United States10-31 17:40
  7. 2.04 km WNW of Fontana, California, United States10-23 09:35
  8. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  9. 2.0Near Loma Linda, California, United States10-28 22:56
  10. 1.95 km ESE of Yucaipa, California, United States10-10 05:59
  11. 1.8Near Loma Linda, California, United States10-28 19:41
  12. 1.8Near Loma Linda, California, United States10-30 04:58
  13. 1.8Near Colton, California, United States10-08 15:49
  14. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  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. 1.714 km NNE of Rancho Cucamonga, California, United States10-09 11:13
  18. 1.64 km W of Fontana, California, United States10-26 13:17
  19. 1.6Near Loma Linda, California, United States10-30 09:25
  20. 1.64 km WNW of Fontana, California, United States10-23 09:37
  21. 1.6Near Loma Linda, California, United States10-18 19:39
  22. 1.65 km SE of Mentone, California, United States10-25 01:46
  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

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Reports on SeismoAtlas

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Event id ci41344455. First recorded here 7 Oct 2026, 09:56:51 UTC. Solutions: USGS · CI (usgs:ci41344455). Cite as: SeismoAtlas, “M1.2 earthquake near Colton, California, United States”, https://seismoatlas.com/earthquake/ci41344455-m1-2-earthquake-near-colton-california-united-states, data from USGS.

JSON: /api/v1/events/ci41344455. SeismoAtlas is not an official warning service.