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SeismoAtlas

M1.3 earthquake 5 km ESE of Loma Linda, California, United States

A magnitude 1.3 earthquake struck 5 km ESE of Loma Linda, California, United States at 01:07 local time (08:07 UTC) on 22 Oct 2026, at a depth of 4 km, according to USGS.

revised from M1.4

Data: USGS · updated 2026-10-22 13:04 UTC · reviewed

Magnitude
1.3micro
local magnitude (Richter) (ml)
revised from 1.4
Depth
4.1 km
Status
Reviewed
Origin time
2026-10-22 08:07:28 UTC
Local: 22 Oct 2026, 01:07:28 (America/Los Angeles)
Epicentre
34.028° N, 117.217° 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. 24,0455 kmINot felt
RedlandsCalifornia, United States · pop. 71,0355 kmINot felt
ColtonCalifornia, United States · pop. 54,62110 kmINot felt
Moreno ValleyCalifornia, United States · pop. 204,19810 kmINot felt
RiversideCalifornia, United States · pop. 317,26119 kmINot felt
AnaheimCalifornia, United States · pop. 350,74267 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22768 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 Survey1.3 mlwas 1.44.1 km34.03° N, 117.22° 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 1 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.

M1.3 releases about 2.5× the energy of M1.0, and its waves are about 1.8× taller on a seismogram. Energy: 1 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

130 later earthquakes within 30 km; the largest was M2.2 13 days ago. 21 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.460.95
1.730.95
2.401.213
9.491.114
13.451.113
19.940.53
20.831.84
20.850.96
21.711.05
21.711.55
22.520.715
24.281.34
25.472.07
25.511.67
25.511.37
26.480.87
53.240.99
60.981.13
62.510.71
63.030.89
65.661.613
71.990.811
72.320.76
76.390.611
95.040.612
101.161.67
101.560.68
103.541.06
108.601.02
111.050.97
112.420.813
112.431.011
114.430.77
115.650.92
118.721.012
137.511.213
147.540.36
152.291.14
152.521.26
153.321.34
153.380.85
154.981.15
155.531.15
155.571.85
155.691.14
158.300.85
158.601.07
158.621.34
158.822.05
159.301.33
162.160.614
162.230.94
162.441.14
163.060.84
164.590.83
181.100.94
185.952.24
186.080.94
187.142.26
187.141.37
187.151.04
187.180.94
187.560.94
187.561.23
188.851.36
188.851.87
189.590.65
189.850.73
189.950.68
190.910.54
191.250.96
191.251.06
191.260.74
192.240.84
192.491.24
192.630.93
192.850.75
192.860.75
192.890.54
193.300.96
193.311.65
193.361.06
194.450.85
196.180.74
196.191.14
200.511.010
204.010.97
207.141.04
216.130.613
216.761.09
220.410.76
220.721.25
220.750.95
220.911.08
225.542.16
233.501.04
234.760.65
242.900.316
243.840.75
277.691.113
286.432.014
286.540.612
299.621.514
310.320.413
310.330.916
310.690.713
310.740.714
316.660.817
335.190.716
341.920.99
359.090.617
360.131.04
373.671.316
380.921.513
382.891.017
383.711.016
385.251.16
385.270.915
423.370.917
428.750.87
446.681.417
447.781.55
454.971.113
457.321.18
458.120.99
467.531.08
473.780.93
500.540.917
502.240.414
510.241.69
  1. 2.2Near Loma Linda, California, United States10-30 02:04
  2. 2.2Near Loma Linda, California, United States10-30 03:15
  3. 2.1Near Loma Linda, California, United States10-31 17:40
  4. 2.04 km WNW of Fontana, California, United States10-23 09:35
  5. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  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. 1.64 km W of Fontana, California, United States10-26 13:17
  11. 1.6Near Loma Linda, California, United States10-30 09:25
  12. 1.64 km WNW of Fontana, California, United States10-23 09:37
  13. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  14. 1.65 km SE of Mentone, California, United States10-25 01:46
  15. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  16. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  17. 1.5Near Loma Linda, California, United States11-07 05:02
  18. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  19. 1.4Near Beaumont, California, United States11-09 22:48
  20. 1.34 km SW of Redlands, California, United States10-28 23:25
  21. 1.35 km SW of Redlands, California, United States10-28 22:44
  22. 1.35 km SW of Redlands, California, United States10-23 08:24
  23. 1.36 km SSW of Redlands, California, United States11-06 21:47
  24. 1.3Near Loma Linda, California, United States10-30 03:16
  25. 1.3Near Loma Linda, California, United States10-30 04:58

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 ci41350391. First recorded here 22 Oct 2026, 08:10:34 UTC. Solutions: USGS · CI (usgs:ci41350391). Cite as: SeismoAtlas, “M1.3 earthquake 5 km ESE of Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41350391-m1-3-earthquake-5-km-ese-of-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41350391. SeismoAtlas is not an official warning service.