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M1.8 earthquake near Colton, California, United States

A magnitude 1.8 earthquake struck near Colton, California, United States at 08:49 local time (15:49 UTC) on 8 Oct 2026, at a depth of 16 km, according to USGS.

revised from M1.8

Data: USGS · updated 2026-10-08 17:13 UTC · reviewed

Magnitude
1.8micro
local magnitude (Richter) (ml)
revised from 1.8
Depth
15.9 km
Status
Reviewed
Origin time
2026-10-08 15:49:16 UTC
Local: 8 Oct 2026, 08:49:16 (America/Los Angeles)
Epicentre
34.087° 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 Survey1.8 mlwas 1.815.9 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 7 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 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.8 releases about 14× the energy of M1.0, and its waves are about 5.8× taller on a seismogram. Energy: 7 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

170 later earthquakes within 30 km; the largest was M2.4 24 days ago. 42 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.640.55
0.680.97
0.840.87
13.611.217
16.560.75
18.540.87
19.411.78
29.991.75
33.030.911
38.171.918
38.481.014
39.100.85
46.310.914
50.021.516
59.601.014
63.421.115
83.291.13
93.090.918
94.940.914
104.251.54
104.480.415
136.001.715
144.681.04
154.710.615
162.741.03
178.840.818
185.082.417
200.071.56
210.140.75
226.971.04
231.850.912
232.370.712
243.841.615
247.770.916
254.792.416
263.581.317
263.641.317
291.531.014
291.571.06
298.730.77
300.541.117
313.511.015
324.301.37
327.430.94
327.901.04
328.301.34
329.760.95
330.040.95
330.701.213
337.801.114
348.240.53
349.131.84
349.160.96
350.021.05
350.021.55
350.830.715
352.581.34
353.782.07
353.811.67
353.821.37
354.790.87
381.550.99
389.281.13
390.810.71
391.330.89
393.961.613
394.830.78
400.290.811
404.690.611
408.451.48
419.661.012
423.350.612
429.471.67
429.870.68
431.851.06
436.911.02
439.360.97
440.730.813
440.731.011
442.730.77
443.950.92
447.031.012
465.811.213
475.840.36
480.591.14
480.831.26
481.631.34
481.680.85
483.281.15
483.831.15
483.871.85
484.001.14
486.600.85
486.911.07
486.921.34
487.122.05
487.611.33
490.470.614
490.540.94
490.751.14
491.360.84
492.890.83
509.400.94
514.252.24
514.390.94
514.621.37
515.442.26
515.451.37
515.461.04
515.480.94
515.860.94
515.871.23
517.151.36
517.161.87
517.890.65
518.160.73
518.250.68
519.210.54
519.550.96
519.551.06
519.560.74
520.550.84
520.791.24
520.930.93
521.150.75
521.160.75
521.190.54
521.600.96
521.611.65
521.661.06
522.750.85
524.480.74
524.491.14
528.811.010
532.320.97
535.441.04
537.950.94
538.161.14
544.430.613
545.061.09
548.710.76
549.021.25
549.050.95
553.852.16
558.261.111
561.811.04
563.060.65
571.200.316
572.140.75
585.741.19
606.001.113
614.732.014
614.840.612
638.990.713
639.040.714
644.960.817
648.111.24
663.500.716
682.940.914
682.950.413
687.390.617
688.441.04
688.791.113
695.230.97
701.971.316
709.221.513
711.191.017
712.021.016
713.551.16
713.570.915
  1. 2.4Near Loma Linda, California, United States10-19 06:36
  2. 2.43 km NW of Calimesa, California, United States10-16 08:53
  3. 2.2Near Loma Linda, California, United States10-30 02:04
  4. 2.2Near Loma Linda, California, United States10-30 03:15
  5. 2.1Near Loma Linda, California, United States10-31 17:40
  6. 2.04 km WNW of Fontana, California, United States10-23 09:35
  7. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  8. 2.0Near Loma Linda, California, United States10-28 22:56
  9. 1.95 km ESE of Yucaipa, California, United States10-10 05:59
  10. 1.8Near Loma Linda, California, United States10-28 19:41
  11. 1.8Near Loma Linda, California, United States10-30 04:58
  12. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  13. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  14. 1.7Near Redlands, California, United States10-14 07:49
  15. 1.714 km NNE of Rancho Cucamonga, California, United States10-09 11:13
  16. 1.64 km W of Fontana, California, United States10-26 13:17
  17. 1.6Near Loma Linda, California, United States10-30 09:25
  18. 1.64 km WNW of Fontana, California, United States10-23 09:37
  19. 1.6Near Loma Linda, California, United States10-18 19:39
  20. 1.65 km SE of Mentone, California, United States10-25 01:46
  21. 1.5Near Colton, California, United States10-10 17:50
  22. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  23. 1.5Near Fontana, California, United States10-13 00:04
  24. 1.5Near Loma Linda, California, United States11-07 05:02
  25. 1.55 km ESE of Loma Linda, California, United States10-23 05:50

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 ci41345079. First recorded here 8 Oct 2026, 15:52:06 UTC. Solutions: USGS · CI (usgs:ci41345079). Cite as: SeismoAtlas, “M1.8 earthquake near Colton, California, United States”, https://seismoatlas.com/earthquake/ci41345079-m1-8-earthquake-near-colton-california-united-states, data from USGS.

JSON: /api/v1/events/ci41345079. SeismoAtlas is not an official warning service.