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SeismoAtlas

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

A magnitude 1.5 earthquake struck 5 km ESE of Loma Linda, California, United States at 22:50 local time (05:50 UTC) on 22 Oct 2026, at a depth of 5 km, according to USGS.

Data: USGS · updated 2026-10-23 22:51 UTC · reviewed

Magnitude
1.5micro
local magnitude (Richter) (ml)
Depth
4.8 km
Status
Reviewed
Origin time
2026-10-23 05:50:20 UTC
Local: 22 Oct 2026, 22:50:20 (America/Los Angeles)
Epicentre
34.032° N, 117.216° 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 kmIIWeak
RedlandsCalifornia, United States · pop. 71,0355 kmIIWeak
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. 256,92769 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 1.54.8 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 2 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 5 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 5.1× the energy of M1.0, and its waves are about 3× taller on a seismogram. Energy: 2 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

120 later earthquakes within 30 km; the largest was M2.2 13 days ago. 29 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.810.715
2.571.34
3.762.07
3.791.67
3.801.37
4.770.87
31.530.99
39.261.13
40.790.71
41.310.89
43.941.613
50.270.811
50.610.76
54.670.611
73.330.612
79.451.67
79.850.68
81.831.06
86.891.02
89.340.97
90.710.813
90.711.011
92.720.77
93.940.92
97.011.012
115.791.213
125.820.36
130.571.14
130.811.26
131.611.34
131.670.85
133.271.15
133.811.15
133.851.85
133.981.14
136.580.85
136.891.07
136.901.34
137.112.05
137.591.33
140.450.614
140.520.94
140.731.14
141.340.84
142.870.83
159.380.94
164.232.24
164.370.94
165.422.26
165.431.37
165.441.04
165.460.94
165.850.94
165.851.23
167.141.36
167.141.87
167.870.65
168.140.73
168.240.68
169.200.54
169.530.96
169.541.06
169.540.74
170.530.84
170.771.24
170.910.93
171.130.75
171.140.75
171.180.54
171.580.96
171.591.65
171.641.06
172.730.85
174.470.74
174.471.14
178.791.010
182.300.97
185.421.04
194.420.613
195.051.09
198.700.76
199.011.25
199.030.95
199.191.08
203.832.16
211.791.04
213.040.65
221.190.316
222.120.75
255.981.113
264.712.014
264.820.612
277.901.514
288.610.413
288.620.916
288.980.713
289.020.714
294.950.817
313.480.716
320.210.99
337.370.617
338.421.04
351.961.316
359.211.513
361.181.017
362.001.016
363.531.16
363.560.915
401.660.917
407.040.87
424.961.417
426.071.55
433.261.113
435.601.18
436.410.99
445.811.08
452.070.93
478.820.917
480.530.414
488.531.69
  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. 1.64 km W of Fontana, California, United States10-26 13:17
  10. 1.6Near Loma Linda, California, United States10-30 09:25
  11. 1.64 km WNW of Fontana, California, United States10-23 09:37
  12. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  13. 1.65 km SE of Mentone, California, United States10-25 01:46
  14. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  15. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  16. 1.5Near Loma Linda, California, United States11-07 05:02
  17. 1.4Near Beaumont, California, United States11-09 22:48
  18. 1.34 km SW of Redlands, California, United States10-28 23:25
  19. 1.35 km SW of Redlands, California, United States10-28 22:44
  20. 1.35 km SW of Redlands, California, United States10-23 08:24
  21. 1.36 km SSW of Redlands, California, United States11-06 21:47
  22. 1.3Near Loma Linda, California, United States10-30 03:16
  23. 1.3Near Loma Linda, California, United States10-30 04:58
  24. 1.34 km SW of Redlands, California, United States10-28 17:26
  25. 1.34 km WNW of Fontana, California, United States10-23 09:38

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 ci41350895. First recorded here 23 Oct 2026, 05:53:13 UTC. Solutions: USGS · CI (usgs:ci41350895). Cite as: SeismoAtlas, “M1.5 earthquake 5 km ESE of Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41350895-m1-5-earthquake-5-km-ese-of-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41350895. SeismoAtlas is not an official warning service.