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M1.0 earthquake 5 km NW of Highland, California, United States

A magnitude 1.0 earthquake struck 5 km NW of Highland, California, United States at 03:33 local time (10:33 UTC) on 15 Oct 2026, at a depth of 3 km, according to USGS.

revised from M1.1

Data: USGS · updated 2026-10-15 12:21 UTC · reviewed

Magnitude
1.0micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
3.4 km
Status
Reviewed
Origin time
2026-10-15 10:33:38 UTC
Local: 15 Oct 2026, 03:33:38 (America/Los Angeles)
Epicentre
34.154° N, 117.251° 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
HighlandCalifornia, United States · pop. 54,8545 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1086 kmINot felt
ColtonCalifornia, United States · pop. 54,62111 kmINot felt
Loma LindaCalifornia, United States · pop. 24,04512 kmINot felt
RiversideCalifornia, United States · pop. 317,26126 kmINot felt
AnaheimCalifornia, United States · pop. 350,74270 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22773 kmINot felt
IrvineCalifornia, United States · pop. 256,92775 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 Survey1.0 mlwas 1.13.4 km34.15° N, 117.25° 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 477 g 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 3 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

The same size.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

143 later earthquakes within 30 km; the largest was M2.4 24 days ago. 31 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
16.100.818
22.342.417
37.331.56
47.400.75
69.110.912
69.630.712
81.101.615
85.030.916
92.052.416
100.841.317
100.901.317
128.791.014
128.831.06
136.000.77
137.801.117
150.771.015
161.561.37
164.690.94
165.161.04
165.561.34
167.030.95
167.300.95
167.961.213
175.061.114
185.500.53
186.391.84
186.420.96
187.281.05
187.281.55
188.090.715
189.841.34
191.042.07
191.071.67
191.081.37
192.050.87
218.810.99
226.541.13
228.070.71
228.590.89
231.221.613
232.090.78
237.550.811
241.950.611
256.921.012
260.610.612
266.731.67
267.130.68
269.111.06
274.171.02
276.620.97
277.990.813
277.991.011
279.990.77
281.220.92
284.291.012
303.071.213
313.100.36
317.851.14
318.091.26
318.891.34
318.950.85
320.541.15
321.091.15
321.131.85
321.261.14
323.860.85
324.171.07
324.181.34
324.392.05
324.871.33
327.730.614
327.800.94
328.011.14
328.620.84
330.150.83
346.660.94
351.512.24
351.650.94
352.702.26
352.711.37
352.721.04
352.740.94
353.130.94
353.131.23
354.411.36
354.421.87
355.150.65
355.420.73
355.510.68
356.470.54
356.810.96
356.811.06
356.820.74
357.810.84
358.051.24
358.190.93
358.410.75
358.420.75
358.450.54
358.860.96
358.871.65
358.921.06
360.010.85
361.750.74
361.751.14
366.071.010
369.580.97
372.701.04
381.690.613
382.321.09
385.970.76
386.281.25
386.310.95
391.112.16
395.521.111
399.071.04
400.320.65
408.470.316
409.400.75
423.001.19
443.261.113
451.992.014
452.100.612
476.260.713
476.300.714
500.760.716
520.200.914
524.650.617
525.701.04
532.490.97
539.231.316
546.481.513
548.451.017
549.281.016
550.811.16
550.830.915
581.081.011
594.310.87
620.541.113
633.091.08
639.350.93
666.031.110
675.811.69
  1. 2.4Near Loma Linda, California, United States10-19 06:36
  2. 2.43 km NW of Calimesa, California, United States10-16 08:53
  3. 2.2Near Loma Linda, California, United States10-30 02:04
  4. 2.2Near Loma Linda, California, United States10-30 03:15
  5. 2.1Near Loma Linda, California, United States10-31 17:40
  6. 2.04 km WNW of Fontana, California, United States10-23 09:35
  7. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  8. 2.0Near Loma Linda, California, United States10-28 22:56
  9. 1.8Near Loma Linda, California, United States10-28 19:41
  10. 1.8Near Loma Linda, California, United States10-30 04:58
  11. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  12. 1.64 km W of Fontana, California, United States10-26 13:17
  13. 1.6Near Loma Linda, California, United States10-30 09:25
  14. 1.64 km WNW of Fontana, California, United States10-23 09:37
  15. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  16. 1.6Near Loma Linda, California, United States10-18 19:39
  17. 1.65 km SE of Mentone, California, United States10-25 01:46
  18. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  19. 1.5Near Loma Linda, California, United States11-07 05:02
  20. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  21. 1.3Near Loma Linda, California, United States10-19 15:27
  22. 1.34 km SW of Redlands, California, United States10-28 23:25
  23. 1.35 km SW of Redlands, California, United States10-28 22:44
  24. 1.314 km WNW of Muscoy, California, United States10-22 04:07
  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.

Event id ci41347831. First recorded here 15 Oct 2026, 10:36:35 UTC. Solutions: USGS · CI (usgs:ci41347831). Cite as: SeismoAtlas, “M1.0 earthquake 5 km NW of Highland, California, United States”, https://seismoatlas.com/earthquake/ci41347831-m1-0-earthquake-5-km-nw-of-highland-california-united-states, data from USGS.

JSON: /api/v1/events/ci41347831. SeismoAtlas is not an official warning service.