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SeismoAtlas

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

A magnitude 1.5 earthquake struck near Loma Linda, California, United States at 05:07 local time (12:07 UTC) on 28 Sept 2026, at a depth of 14 km, according to USGS.

Data: USGS · updated 2026-09-28 13:20 UTC · reviewed

Magnitude
1.5micro
local magnitude (Richter) (ml)
Depth
14.3 km
Status
Reviewed
Origin time
2026-09-28 12:07:55 UTC
Local: 28 Sept 2026, 05:07:55 (America/Los Angeles)
Epicentre
34.064° N, 117.263° 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. 24,0452 kmINot felt
ColtonCalifornia, United States · pop. 54,6214 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1086 kmINot felt
RedlandsCalifornia, United States · pop. 71,0358 kmINot felt
RiversideCalifornia, United States · pop. 317,26118 kmINot felt
AnaheimCalifornia, United States · pop. 350,74265 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22766 kmINot felt
IrvineCalifornia, United States · pop. 256,92768 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 ml14.3 km34.06° N, 117.26° W–Reviewed

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 14 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 5.2× the energy of M1.0, and its waves are about 3× 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

136 later earthquakes within 30 km; the largest was M2.7 35 days ago. 27 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
8.191.115
33.530.718
35.581.116
41.760.85
49.851.616
57.710.913
61.121.32
67.561.017
70.152.110
98.161.28
118.860.710
127.741.75
131.870.87
152.960.85
153.831.015
161.281.517
162.211.017
166.591.44
166.650.73
167.050.84
167.551.24
167.711.44
167.800.94
197.421.116
202.041.011
204.562.19
210.590.817
212.280.616
213.771.216
214.050.73
223.631.416
229.520.96
230.271.57
230.491.16
233.780.96
235.640.916
235.730.97
236.021.47
236.022.76
236.281.16
237.901.07
238.121.27
238.450.77
238.540.87
238.540.97
238.691.27
239.680.47
239.731.05
242.371.16
243.270.76
243.691.816
244.330.55
244.370.97
244.530.87
253.721.78
257.301.217
262.230.87
276.720.911
281.851.918
282.171.014
282.790.85
290.000.914
293.711.516
303.291.014
307.111.115
326.971.13
336.780.918
337.710.316
338.630.914
347.941.54
348.170.415
379.691.715
388.371.04
398.400.615
406.431.03
422.530.818
428.772.417
443.761.56
444.231.717
444.241.517
453.820.75
472.311.116
475.540.912
476.060.712
487.531.615
491.460.916
498.482.416
507.271.317
507.331.317
535.221.014
535.261.06
542.420.77
544.231.117
557.201.015
567.991.37
571.120.94
571.591.04
571.991.34
573.450.95
573.730.95
574.391.213
581.491.114
591.930.53
592.821.84
592.840.96
593.711.05
593.711.55
594.510.715
596.271.34
597.462.07
597.501.67
597.511.37
598.480.87
625.240.99
632.971.13
634.500.71
635.020.89
637.651.613
643.980.811
644.320.76
648.380.611
652.141.48
663.351.012
667.030.612
673.161.67
673.560.68
675.541.06
680.601.02
683.050.97
684.420.813
684.421.011
686.420.77
687.640.92
690.721.012
709.501.213
719.530.36
  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. 2.15 km NNW of Fontana, California, United States10-07 00:41
  5. 2.112 km NW of Muscoy, California, United States10-01 10:16
  6. 2.04 km WNW of Fontana, California, United States10-23 09:35
  7. 1.95 km ESE of Yucaipa, California, United States10-10 05:59
  8. 1.8Near Colton, California, United States10-08 15:49
  9. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  10. 1.76 km WNW of Jurupa Valley, California, United States10-03 19:52
  11. 1.7Near Redlands, California, United States10-14 07:49
  12. 1.7Near Cherry Valley, California, United States10-09 01:51
  13. 1.74 km WSW of Beaumont, California, United States10-17 00:21
  14. 1.64 km W of Fontana, California, United States10-26 13:17
  15. 1.63 km SE of Loma Linda, California, United States09-30 13:59
  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. 1.65 km SE of Mentone, California, United States10-25 01:46
  19. 1.5Near Colton, California, United States10-10 17:50
  20. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  21. 1.5Near Fontana, California, United States10-13 00:04
  22. 1.5Near Loma Linda, California, United States10-05 05:24
  23. 1.54 km WNW of Fontana, California, United States10-08 02:24
  24. 1.54 km WSW of Beaumont, California, United States10-17 00:22
  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 ci41340215. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · CI (usgs:ci41340215). Cite as: SeismoAtlas, “M1.5 earthquake near Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41340215-m1-5-earthquake-near-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41340215. SeismoAtlas is not an official warning service.