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M1.3 earthquake 29 km SSE of Valle Vista, California, United States

A magnitude 1.3 earthquake struck 29 km SSE of Valle Vista, California, United States at 20:42 local time (03:42 UTC) on 21 Sept 2026, at a depth of 4 km, according to USGS.

Data: USGS · updated 2026-09-22 13:54 UTC · reviewed

Magnitude
1.3micro
local magnitude (Richter) (ml)
Depth
4.2 km
Status
Reviewed
Origin time
2026-09-22 03:42:57 UTC
Local: 21 Sept 2026, 20:42:57 (America/Los Angeles)
Epicentre
33.517° N, 116.737° 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
Valle VistaCalifornia, United States · pop. 14,57829 kmINot felt
East HemetCalifornia, United States · pop. 17,41831 kmINot felt
HemetCalifornia, United States · pop. 83,86134 kmINot felt
San JacintoCalifornia, United States · pop. 46,95136 kmINot felt
Cathedral CityCalifornia, United States · pop. 53,82638 kmINot felt
TemeculaCalifornia, United States · pop. 110,00338 kmINot felt
RiversideCalifornia, United States · pop. 317,26178 kmINot felt
San DiegoCalifornia, United States · pop. 1,404,45297 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 Survey1.3 ml4.2 km33.52° N, 116.74° W–Reviewed

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How big was it?

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

It released roughly the energy of 1 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 4 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.3 releases about 2.9× the energy of M1.0, and its waves are about 2× taller on a seismogram. Energy: 1 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

100 later earthquakes within 30 km; the largest was M2.6 5 days ago. 9 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.12-0.14
3.240.26
3.25-0.17
4.770.59
15.220.45
16.420.815
17.320.815
21.430.916
23.490.811
23.740.214
24.931.28
26.490.86
26.950.17
28.341.513
29.521.58
30.600.715
30.851.716
31.152.613
31.200.012
31.580.612
33.101.03
33.11-0.14
34.740.16
35.740.35
36.260.812
39.800.612
40.000.67
40.950.313
41.950.512
45.550.714
47.350.612
48.840.411
50.080.312
51.000.613
54.790.712
56.230.412
59.440.96
60.350.313
68.960.312
73.551.112
74.420.412
81.501.114
82.260.66
82.500.616
83.340.613
86.590.312
87.600.313
90.060.512
91.681.15
97.400.514
99.240.95
99.810.315
99.920.612
100.121.112
101.220.315
101.230.015
101.230.615
101.270.414
102.030.37
102.430.412
102.570.06
103.080.212
105.63-0.06
106.530.914
110.070.210
111.150.46
115.240.612
119.781.614
119.781.620
119.782.314
119.791.213
121.280.412
121.360.512
123.50-0.06
124.330.718
125.460.814
127.980.26
128.730.617
129.050.93
129.510.910
130.910.513
131.551.413
135.001.513
139.490.56
140.160.86
143.001.712
143.040.913
143.691.114
144.700.213
147.460.62
153.330.411
154.610.515
154.721.117
157.011.213
157.390.611
157.400.313
157.530.716
159.160.710
159.170.411
164.440.412
  1. 2.622 km SSE of Valle Vista, California, United States09-23 10:52
  2. 2.326 km SW of La Quinta, California, United States09-27 03:29
  3. 1.713 km ESE of Valle Vista, California, United States09-23 10:34
  4. 1.723 km SSE of Valle Vista, California, United States09-28 02:42
  5. 1.626 km SW of La Quinta, California, United States09-27 03:29
  6. 1.623 km SSW of La Quinta, California, United States09-27 03:29
  7. 1.536 km SW of La Quinta, California, United States09-23 09:14
  8. 1.525 km SW of La Quinta, California, United States09-27 18:42
  9. 1.526 km SW of La Quinta, California, United States09-23 08:03
  10. 1.424 km E of Temecula, California, United States09-27 15:15
  11. 1.225 km SW of La Quinta, California, United States09-27 03:30
  12. 1.238 km SW of La Quinta, California, United States09-23 04:38
  13. 1.225 km SW of La Quinta, California, United States09-28 16:43
  14. 1.122 km SSE of Valle Vista, California, United States09-25 05:15
  15. 1.116 km SE of Valle Vista, California, United States09-25 13:12
  16. 1.129 km SE of Valle Vista, California, United States09-25 23:23
  17. 1.116 km SE of Valle Vista, California, United States09-28 03:24
  18. 1.120 km ESE of Valle Vista, California, United States09-28 14:25
  19. 1.122 km SSE of Valle Vista, California, United States09-26 07:50
  20. 1.030 km SSE of Valle Vista, California, United States09-23 12:49
  21. 0.941 km ENE of Valley Center, California, United States09-26 06:57
  22. 0.928 km SSE of Valle Vista, California, United States09-27 12:45
  23. 0.923 km SSE of Valle Vista, California, United States09-28 02:45
  24. 0.913 km ESE of Valle Vista, California, United States09-23 01:08
  25. 0.934 km ENE of Valley Center, California, United States09-27 13:13

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Reports on SeismoAtlas

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Event id ci41336615. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · CI (usgs:ci41336615). Cite as: SeismoAtlas, “M1.3 earthquake 29 km SSE of Valle Vista, California, United States”, https://seismoatlas.com/earthquake/ci41336615-m1-3-earthquake-29-km-sse-of-valle-vista-california-united-states, data from USGS.

JSON: /api/v1/events/ci41336615. SeismoAtlas is not an official warning service.