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M1.6 earthquake near Loma Linda, California, United States

A magnitude 1.6 earthquake struck near Loma Linda, California, United States at 12:39 local time (19:39 UTC) on 18 Oct 2026, at a depth of 15 km, according to USGS.

revised from M1.6

Data: USGS · updated 2026-10-18 20:04 UTC · reviewed

Magnitude
1.6micro
local magnitude (Richter) (ml)
revised from 1.6
Depth
15.2 km
Status
Reviewed
Origin time
2026-10-18 19:39:42 UTC
Local: 18 Oct 2026, 12:39:42 (America/Los Angeles)
Epicentre
34.043° N, 117.258° 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
Grand TerraceCalifornia, United States · pop. 12,4645 kmINot felt
ColtonCalifornia, United States · pop. 54,6216 kmINot felt
RedlandsCalifornia, United States · pop. 71,0357 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1088 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

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 Survey1.6 mlwas 1.615.2 km34.04° N, 117.26° 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 15 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.6 releases about 6.9× the energy of M1.0, and its waves are about 3.6× 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

150 later earthquakes within 30 km; the largest was M2.4 24 days ago. 19 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.930.916
10.952.416
19.741.317
19.801.317
47.691.014
47.731.06
54.890.77
56.701.117
69.671.015
80.461.37
83.590.94
84.061.04
84.461.34
85.920.95
86.200.95
86.861.213
93.961.114
104.400.53
105.291.84
105.310.96
106.181.05
106.181.55
106.990.715
108.741.34
109.942.07
109.971.67
109.981.37
110.950.87
137.710.99
145.441.13
146.970.71
147.490.89
150.121.613
156.450.811
156.790.76
160.850.611
164.611.48
175.821.012
179.510.612
185.631.67
186.030.68
188.011.06
193.071.02
195.520.97
196.890.813
196.891.011
198.890.77
200.110.92
203.191.012
221.971.213
232.000.36
236.751.14
236.991.26
237.791.34
237.840.85
239.441.15
239.991.15
240.031.85
240.161.14
242.760.85
243.071.07
243.081.34
243.282.05
243.591.0-1
243.771.33
246.630.614
246.690.94
246.911.14
247.520.84
249.050.83
265.560.94
270.412.24
270.550.94
271.602.26
271.611.37
271.621.04
271.640.94
272.020.94
272.031.23
273.311.36
273.321.87
274.050.65
274.320.73
274.410.68
275.370.54
275.710.96
275.711.06
275.720.74
276.710.84
276.951.24
277.090.93
277.310.75
277.320.75
277.350.54
277.760.96
277.771.65
277.821.06
278.910.85
280.640.74
280.651.14
284.971.010
287.360.90
288.480.97
291.601.04
300.590.613
301.221.09
304.870.76
305.181.25
305.210.95
305.371.08
310.012.16
314.421.111
317.971.04
319.220.65
327.360.316
328.300.75
341.901.19
362.151.113
370.892.014
371.000.612
394.790.413
394.800.916
395.150.713
395.200.714
401.120.817
404.271.24
419.660.716
426.380.99
443.550.617
444.601.04
451.390.97
458.041.40
458.131.316
465.381.513
467.351.017
468.181.016
469.711.16
469.730.915
499.971.011
507.840.917
513.210.87
531.141.417
532.251.55
539.441.113
541.781.18
542.590.99
551.991.08
558.250.93
584.931.110
594.711.69
  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. 2.04 km WNW of Fontana, California, United States10-23 09:35
  6. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  7. 2.0Near Loma Linda, California, United States10-28 22:56
  8. 1.8Near Loma Linda, California, United States10-28 19:41
  9. 1.8Near Loma Linda, California, United States10-30 04:58
  10. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  11. 1.64 km W of Fontana, California, United States10-26 13:17
  12. 1.6Near Loma Linda, California, United States10-30 09:25
  13. 1.64 km WNW of Fontana, California, United States10-23 09:37
  14. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  15. 1.65 km SE of Mentone, California, United States10-25 01:46
  16. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  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. 1.46 km NW of Jurupa Valley, California, United States10-25 16:16
  21. 1.4Near Home Gardens, California, United States11-06 21:41
  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. 1.314 km WNW of Muscoy, California, United States10-22 04:07

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 ci41349063. First recorded here 18 Oct 2026, 19:43:01 UTC. Solutions: USGS · CI (usgs:ci41349063). Cite as: SeismoAtlas, “M1.6 earthquake near Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41349063-m1-6-earthquake-near-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41349063. SeismoAtlas is not an official warning service.