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M1.0 earthquake near Loma Linda, California, United States

A magnitude 1.0 earthquake struck near Loma Linda, California, United States at 18:37 local time (01:37 UTC) on 31 Oct 2026, at a depth of 4 km, according to USGS.

revised from M1.2

Data: USGS · updated 2026-11-02 15:54 UTC · reviewed

Magnitude
1.0micro
local magnitude (Richter) (ml)
revised from 1.2
Depth
4.4 km
Status
Reviewed
Origin time
2026-11-01 01:37:41 UTC
Local: 31 Oct 2026, 18:37:41 (America/Los Angeles)
Epicentre
34.035° N, 117.243° 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. 24,0452 kmINot felt
Grand TerraceCalifornia, United States · pop. 12,4646 kmINot felt
RedlandsCalifornia, United States · pop. 71,0357 kmINot felt
ColtonCalifornia, United States · pop. 54,6217 kmINot felt
San BernardinoCalifornia, United States · pop. 216,1089 kmINot felt
RiversideCalifornia, United States · pop. 317,26117 kmINot felt
AnaheimCalifornia, United States · pop. 350,74265 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22766 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 1.24.4 km34.03° N, 117.24° 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 494 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 4 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.0 releases about 1× the energy of M1.0, and its waves are about 1× taller on a seismogram. Energy: 494 g 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

37 later earthquakes within 30 km; the largest was M2.0 9 days ago. 78 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.250.65
9.400.316
10.330.75
23.931.19
44.191.113
52.922.014
53.040.612
66.111.514
76.820.413
76.830.916
77.190.713
77.240.714
83.160.817
101.690.716
108.420.99
125.580.617
126.631.04
133.420.97
140.171.316
147.421.513
149.391.017
150.211.016
151.741.16
151.770.915
182.011.011
189.870.917
195.250.87
213.171.417
214.281.55
221.471.113
223.811.18
224.620.99
234.021.08
240.280.93
266.971.110
268.740.414
276.741.69
  1. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  2. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  3. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  4. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  5. 1.5Near Loma Linda, California, United States11-07 05:02
  6. 1.4Near Beaumont, California, United States11-09 22:48
  7. 1.36 km SSW of Redlands, California, United States11-06 21:47
  8. 1.111 km NW of Muscoy, California, United States11-10 07:05
  9. 1.1Near Loma Linda, California, United States11-07 09:22
  10. 1.1Near Cherry Valley, California, United States11-10 09:26
  11. 1.113 km NE of Rancho Cucamonga, California, United States11-02 01:33
  12. 1.114 km WNW of Muscoy, California, United States11-12 04:35
  13. 1.13 km NNW of Cherry Valley, California, United States11-02 21:48
  14. 1.04 km SW of Redlands, California, United States11-06 08:15
  15. 1.05 km ENE of Rancho Cucamonga, California, United States11-08 15:38
  16. 1.05 km NNW of Fontana, California, United States11-10 19:39
  17. 1.0Near Loma Linda, California, United States11-07 07:50
  18. 1.0Near Loma Linda, California, United States11-07 07:00
  19. 0.99 km NE of Nuevo, California, United States11-08 23:29
  20. 0.9Near San Bernardino, California, United States11-07 09:23
  21. 0.9Near Cherry Valley, California, United States11-05 14:02
  22. 0.9Near Beaumont, California, United States11-04 06:27
  23. 0.911 km E of Lake Arrowhead, California, United States11-11 01:54
  24. 0.913 km NW of Muscoy, California, United States11-06 15:02
  25. 0.9Near Cherry Valley, California, United States11-10 10:14

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Reports on SeismoAtlas

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Event id ci41570640. First recorded here 1 Nov 2026, 01:40:25 UTC. Solutions: USGS · CI (usgs:ci41570640). Cite as: SeismoAtlas, “M1.0 earthquake near Loma Linda, California, United States”, https://seismoatlas.com/earthquake/ci41570640-m1-0-earthquake-near-loma-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41570640. SeismoAtlas is not an official warning service.