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M1.5 earthquake near Loma Linda, California, United States

A magnitude 1.5 earthquake struck near Loma Linda, California, United States at 22:24 local time (05:24 UTC) on 4 Oct 2026, at a depth of 17 km, according to USGS.

revised from M1.6

Data: USGS · updated 2026-10-05 15:37 UTC · reviewed

Magnitude
1.5micro
local magnitude (Richter) (ml)
revised from 1.6
Depth
17.3 km
Status
Reviewed
Origin time
2026-10-05 05:24:48 UTC
Local: 4 Oct 2026, 22:24:48 (America/Los Angeles)
Epicentre
34.054° N, 117.267° 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
Loma LindaCalifornia, United States · pop. 24,0451 kmINot felt
ColtonCalifornia, United States · pop. 54,6214 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1087 kmINot felt
RedlandsCalifornia, United States · pop. 71,0358 kmINot felt
RiversideCalifornia, United States · pop. 317,26117 kmINot felt
AnaheimCalifornia, United States · pop. 350,74264 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 Survey1.5 mlwas 1.617.3 km34.05° N, 117.27° 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 17 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 5.8× the energy of M1.0, and its waves are about 3.2× 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

191 later earthquakes within 30 km; the largest was M2.7 35 days ago. 23 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.931.017
5.311.44
5.370.73
5.760.84
6.271.24
6.431.44
6.520.94
36.141.116
40.761.011
43.282.19
49.300.817
51.000.616
52.491.216
52.770.73
62.351.416
68.240.96
68.991.57
69.211.16
72.500.96
74.350.916
74.450.97
74.731.47
74.742.76
75.001.16
76.621.07
76.841.27
77.170.77
77.250.87
77.250.97
77.411.27
78.400.47
78.451.05
81.091.16
81.990.76
82.411.816
83.050.55
83.090.97
83.250.87
92.441.78
96.021.217
98.970.75
100.950.87
112.401.75
115.440.911
120.571.918
120.891.014
121.510.85
128.720.914
132.431.516
142.011.014
145.831.115
165.691.13
175.500.918
176.430.316
177.350.914
186.661.54
186.890.415
218.411.715
227.091.04
237.120.615
245.151.03
261.240.818
267.482.417
282.481.56
282.951.717
282.961.517
292.540.75
311.031.116
314.260.912
314.780.712
326.251.615
330.180.916
337.202.416
345.991.317
346.051.317
373.941.014
373.971.06
381.140.77
382.951.117
395.921.015
406.711.37
409.840.94
410.311.04
410.711.34
412.170.95
412.450.95
413.111.213
420.211.114
430.650.53
431.541.84
431.560.96
432.431.05
432.431.55
433.230.715
434.991.34
436.182.07
436.221.67
436.221.37
437.200.87
463.960.99
471.691.13
473.220.71
473.740.89
476.371.613
482.700.811
483.040.76
487.100.611
490.861.48
502.071.012
505.750.612
511.881.67
512.270.68
514.261.06
519.321.02
521.760.97
523.130.813
523.141.011
525.140.77
526.360.92
529.431.012
548.221.213
558.250.36
563.001.14
563.231.26
564.031.34
564.090.85
565.691.15
566.241.15
566.281.85
566.411.14
569.010.85
569.321.07
569.331.34
569.532.05
569.841.0-1
570.021.33
572.870.614
572.940.94
573.151.14
573.770.84
575.300.83
591.810.94
596.662.24
596.800.94
597.031.37
597.852.26
597.851.37
597.861.04
597.890.94
598.270.94
598.281.23
599.561.36
599.561.87
600.300.65
600.560.73
600.660.68
601.620.54
601.960.96
601.961.06
601.970.74
602.950.84
603.201.24
603.340.93
603.560.75
603.570.75
603.600.54
604.010.96
604.021.65
604.071.06
605.160.85
606.890.74
606.901.14
611.221.010
614.730.97
617.851.04
626.840.613
627.471.09
631.120.76
631.431.25
631.460.95
631.621.08
636.252.16
640.671.111
644.211.04
645.470.65
653.610.316
654.550.75
668.151.19
688.401.113
697.142.014
697.250.612
  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. 2.15 km NNW of Fontana, California, United States10-07 00:41
  7. 2.1Near Loma Linda, California, United States10-31 17:40
  8. 2.04 km WNW of Fontana, California, United States10-23 09:35
  9. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  10. 2.0Near Loma Linda, California, United States10-28 22:56
  11. 1.95 km ESE of Yucaipa, California, United States10-10 05:59
  12. 1.8Near Loma Linda, California, United States10-28 19:41
  13. 1.8Near Loma Linda, California, United States10-30 04:58
  14. 1.8Near Colton, California, United States10-08 15:49
  15. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  16. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  17. 1.7Near Redlands, California, United States10-14 07:49
  18. 1.7Near Cherry Valley, California, United States10-09 01:51
  19. 1.74 km WSW of Beaumont, California, United States10-17 00:21
  20. 1.64 km W of Fontana, California, United States10-26 13:17
  21. 1.6Near Loma Linda, California, United States10-30 09:25
  22. 1.64 km WNW of Fontana, California, United States10-23 09:37
  23. 1.6Near Loma Linda, California, United States10-18 19:39
  24. 1.65 km SE of Mentone, California, United States10-25 01:46
  25. 1.5Near Colton, California, United States10-10 17:50

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Reports on SeismoAtlas

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Event id ci41343343. First recorded here 5 Oct 2026, 05:27:49 UTC. Solutions: USGS · CI (usgs:ci41343343). Cite as: SeismoAtlas, “M1.5 earthquake near Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41343343-m1-5-earthquake-near-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41343343. SeismoAtlas is not an official warning service.