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M2.4 earthquake 3 km NW of Calimesa, California, United States

A magnitude 2.4 earthquake struck 3 km NW of Calimesa, California, United States at 01:53 local time (08:53 UTC) on 16 Oct 2026, at a depth of 17 km, according to USGS.

revised from M2.4 · 1 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-10-16 16:00 UTC · reviewed

Magnitude
2.4micro
local magnitude (Richter) (ml)
revised from 2.4
Depth
16.9 km
Status
Reviewed
Origin time
2026-10-16 08:53:52 UTC
Local: 16 Oct 2026, 01:53:52 (America/Los Angeles)
Epicentre
34.021° N, 117.083° 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
CalimesaCalifornia, United States · pop. 8,5423 kmINot felt
YucaipaCalifornia, United States · pop. 53,3284 kmINot felt
RedlandsCalifornia, United States · pop. 71,03510 kmINot felt
BeaumontCalifornia, United States · pop. 43,81114 kmINot felt
Moreno ValleyCalifornia, United States · pop. 204,19816 kmINot felt
RiversideCalifornia, United States · pop. 317,26130 kmINot felt
IrvineCalifornia, United States · pop. 256,92778 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22779 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 Survey2.4 mlwas 2.416.9 km34.02° N, 117.08° W–Reviewed · 3 revisions

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 56 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.

M2.4 releases about 30× the energy of M1.4, and its waves are about 9.5× taller on a seismogram. Energy: 56 kg of TNT vs 2 kg of TNT.

Each square is the energy of one M1.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

147 later earthquakes within 30 km; the largest was M2.4 24 days ago. 27 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.4

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
15.471.717
15.471.517
25.060.75
43.541.116
46.770.912
47.300.712
58.761.615
62.690.916
69.712.416
78.501.317
78.561.317
79.731.117
94.801.411
106.461.014
115.461.117
128.441.015
142.360.94
142.821.04
143.231.34
144.690.95
144.960.95
145.621.213
152.721.114
152.720.89
156.681.113
164.051.84
164.080.96
164.941.05
164.941.55
165.750.715
167.511.34
181.240.613
194.081.04
196.470.99
203.451.013
204.211.13
205.730.71
208.881.613
215.210.811
215.550.76
219.620.611
235.550.417
238.270.612
242.230.512
244.790.68
246.031.214
251.831.02
255.650.813
255.651.011
258.880.92
261.951.012
290.760.36
295.511.14
295.751.26
296.551.34
296.610.85
297.241.010
298.211.15
298.761.15
298.801.85
298.921.14
301.520.85
301.831.07
301.841.34
302.052.05
302.531.33
305.390.614
305.460.94
305.671.14
306.290.84
307.810.83
321.500.818
324.320.94
329.172.24
329.310.94
330.362.26
330.371.37
330.381.04
330.400.94
330.790.94
330.791.23
332.081.36
332.081.87
332.810.65
333.080.73
333.180.68
334.140.54
334.480.96
334.481.06
334.490.74
335.470.84
335.711.24
335.860.93
336.070.75
336.090.75
336.120.54
336.520.96
336.531.65
336.581.06
337.680.85
339.410.74
339.421.14
347.240.97
350.361.04
359.360.613
363.640.76
363.951.25
363.980.95
364.141.08
368.772.16
375.811.117
376.731.04
377.990.65
386.130.316
387.060.75
401.910.89
409.150.69
411.931.713
420.921.113
429.652.014
429.770.612
442.851.514
453.550.413
453.560.916
453.920.713
453.970.714
459.890.817
478.420.716
485.150.99
499.420.514
502.310.617
503.361.04
516.901.316
524.151.513
526.121.017
526.941.016
528.471.16
528.500.915
554.380.520
566.600.917
589.901.417
591.011.55
600.541.18
601.350.99
617.010.93
643.770.917
645.470.414
  1. 2.4Near Loma Linda, California, United States10-19 06:36
  2. 2.2Near Loma Linda, California, United States10-30 02:04
  3. 2.2Near Loma Linda, California, United States10-30 03:15
  4. 2.1Near Loma Linda, California, United States10-31 17:40
  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. 1.76 km ENE of San Jacinto, California, United States11-02 12:49
  11. 1.74 km WSW of Beaumont, California, United States10-17 00:21
  12. 1.6Near Loma Linda, California, United States10-30 09:25
  13. 1.6Near Loma Linda, California, United States10-18 19:39
  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. 1.54 km WSW of Beaumont, California, United States10-17 00:22
  19. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  20. 1.4Near Beaumont, California, United States11-09 22:48
  21. 1.43 km ESE of Nuevo, California, United States10-20 07:41
  22. 1.3Near Loma Linda, California, United States10-19 15:27
  23. 1.34 km SW of Redlands, California, United States10-28 23:25
  24. 1.35 km SW of Redlands, California, United States10-28 22:44
  25. 1.35 km SW of Redlands, California, United States10-23 08:24

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.

USGS “Did You Feel It?” has 1 reports: add yours at USGS.

Event id ci41348223. First recorded here 16 Oct 2026, 08:57:29 UTC. Solutions: USGS · CI (usgs:ci41348223). Cite as: SeismoAtlas, “M2.4 earthquake 3 km NW of Calimesa, California, United States”, https://seismoatlas.com/earthquake/ci41348223-m2-4-earthquake-3-km-nw-of-calimesa-california-united-states, data from USGS.

JSON: /api/v1/events/ci41348223. SeismoAtlas is not an official warning service.