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M1.7 earthquake 6 km WNW of Jurupa Valley, California, United States

A magnitude 1.7 earthquake struck 6 km WNW of Jurupa Valley, California, United States at 12:52 local time (19:52 UTC) on 3 Oct 2026, at a depth of 5 km, according to USGS.

Data: USGS · updated 2026-10-04 14:40 UTC · reviewed

Magnitude
1.7micro
local magnitude (Richter) (ml)
Depth
4.7 km
Status
Reviewed
Origin time
2026-10-03 19:52:05 UTC
Local: 3 Oct 2026, 12:52:05 (America/Los Angeles)
Epicentre
34.017° N, 117.582° W

Agencies reported this earthquake under two records that have not been merged yet. The main page is M1.9 earthquake 7 km NNW of Eastvale, California, United States.

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
Jurupa ValleyCalifornia, United States · pop. 21,9306 kmIIWeak
EastvaleCalifornia, United States · pop. 59,0397 kmIIWeak
OntarioCalifornia, United States · pop. 171,2148 kmINot felt
Glen AvonCalifornia, United States · pop. 20,1999 kmINot felt
RiversideCalifornia, United States · pop. 317,26118 kmINot felt
AnaheimCalifornia, United States · pop. 350,74236 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22740 kmINot felt
IrvineCalifornia, United States · pop. 256,92744 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 Survey1.7 ml4.7 km34.02° N, 117.58° W–Reviewed · 1 revision

How big was it?

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

It released roughly the energy of 6 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.

M1.7 releases about 13× the energy of M1.0, and its waves are about 5.5× taller on a seismogram. Energy: 6 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

89 later earthquakes within 30 km; the largest was M2.7 35 days ago. 13 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.281.07
4.130.87
7.430.77
13.820.93
33.551.517
37.220.99
71.890.36
74.311.011
76.822.19
82.850.817
86.031.216
88.780.69
95.891.416
99.780.30
101.780.96
102.541.57
102.761.16
106.040.96
107.990.97
108.281.47
108.282.76
108.551.16
110.161.07
110.381.27
110.720.77
110.800.87
110.800.97
110.951.27
111.940.47
111.991.05
112.550.67
114.631.16
115.530.76
115.951.816
116.590.55
116.640.97
116.800.87
132.510.75
134.500.87
135.361.78
145.951.75
145.991.50
162.270.914
165.971.516
179.371.115
199.241.13
220.201.54
259.441.210
260.641.04
264.301.70
312.061.22
312.851.04
316.021.56
342.921.04
407.521.06
407.741.1-1
414.690.77
429.471.015
440.251.37
464.200.53
469.732.07
469.761.67
469.771.37
470.740.87
478.721.3-1
507.280.89
510.780.78
520.640.611
524.411.48
535.611.012
545.421.67
547.801.06
553.191.4-1
555.310.97
558.690.77
572.410.98
576.180.90
581.761.213
603.391.0-1
622.641.40
630.571.37
644.761.010
647.160.90
653.900.94
654.111.14
658.870.913
661.021.09
674.211.111
701.691.19
  1. 2.74 km WNW of Fontana, California, United States10-08 08:09
  2. 2.15 km NNW of Fontana, California, United States10-07 00:41
  3. 2.04 km WNW of Fontana, California, United States10-23 09:35
  4. 1.8Near Colton, California, United States10-08 15:49
  5. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  6. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  7. 1.714 km NNE of Rancho Cucamonga, California, United States10-09 11:13
  8. 1.64 km W of Fontana, California, United States10-26 13:17
  9. 1.64 km WNW of Fontana, California, United States10-23 09:37
  10. 1.5Near Colton, California, United States10-10 17:50
  11. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  12. 1.5Near Fontana, California, United States10-13 00:04
  13. 1.5Near Loma Linda, California, United States10-05 05:24
  14. 1.54 km WNW of Fontana, California, United States10-08 02:24
  15. 1.54 km ESE of El Cerrito Corona, California, United States10-09 21:51
  16. 1.4Near Loma Linda, California, United States10-07 19:45
  17. 1.4Near El Cerrito Corona, California, United States10-29 18:30
  18. 1.43 km ENE of El Cerrito Corona, California, United States10-26 21:03
  19. 1.46 km NW of Jurupa Valley, California, United States10-25 16:16
  20. 1.45 km W of Fontana, California, United States10-08 08:08
  21. 1.37 km NNW of Eastvale, California, United States10-30 02:26
  22. 1.314 km WNW of Muscoy, California, United States10-22 04:07
  23. 1.3Near El Cerrito Corona, California, United States10-23 18:35
  24. 1.34 km WNW of Fontana, California, United States10-23 09:38
  25. 1.2Near El Cerrito Corona, California, United States10-16 19:55

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

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Reports on SeismoAtlas

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Event id ci41342615. First recorded here 3 Oct 2026, 19:56:30 UTC. Solutions: USGS · CI (usgs:ci41342615). Cite as: SeismoAtlas, “M1.7 earthquake 6 km WNW of Jurupa Valley, California, United States”, https://seismoatlas.com/earthquake/ci41342615-m1-7-earthquake-6-km-wnw-of-jurupa-valley-california-united-states, data from USGS.

JSON: /api/v1/events/ci41342615. SeismoAtlas is not an official warning service.