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M0.8 earthquake near Calimesa, California, United States

A magnitude 0.8 earthquake struck near Calimesa, California, United States at 18:56 local time (01:56 UTC) on 23 Sept 2026, at a depth of 15 km, according to USGS.

Data: USGS · updated 2026-09-24 16:21 UTC · reviewed

Magnitude
0.8micro
local magnitude (Richter) (ml)
Depth
15.2 km
Status
Reviewed
Origin time
2026-09-24 01:56:40 UTC
Local: 23 Sept 2026, 18:56:40 (America/Los Angeles)
Epicentre
33.985° N, 117.053° 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
CalimesaCalifornia, United States · pop. 8,5422 kmINot felt
YucaipaCalifornia, United States · pop. 53,3285 kmINot felt
BeaumontCalifornia, United States · pop. 43,8119 kmINot felt
RedlandsCalifornia, United States · pop. 71,03514 kmINot felt
Moreno ValleyCalifornia, United States · pop. 204,19817 kmINot felt
RiversideCalifornia, United States · pop. 317,26132 kmINot felt
IrvineCalifornia, United States · pop. 256,92779 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22780 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 Survey0.8 ml15.2 km33.99° N, 117.05° 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 239 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 15 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 2× the energy of M0.8, and its waves are about 1.6× taller on a seismogram. Energy: 477 g of TNT vs 239 g of TNT.

Each square is the energy of one M0.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

25 later earthquakes within 30 km; the largest was M1.5 15 h ago. 9 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.860.610
9.870.915
14.571.116
15.571.115
27.401.213
33.700.914
33.730.714
43.910.711
45.720.813
50.700.816
58.401.013
72.911.29
79.830.816
82.820.93
85.030.811
85.821.011
91.711.218
91.721.118
92.760.72
93.780.816
99.870.815
99.880.914
102.350.812
106.191.514
114.381.115
  1. 1.5Near Loma Linda, California, United States09-28 12:07
  2. 1.24 km NE of Banning, California, United States09-27 02:51
  3. 1.27 km NE of Banning, California, United States09-27 21:39
  4. 1.28 km S of Beaumont, California, United States09-25 05:20
  5. 1.17 km NE of Banning, California, United States09-27 21:40
  6. 1.16 km S of Redlands, California, United States09-28 20:19
  7. 1.1Near Calimesa, California, United States09-24 16:30
  8. 1.16 km S of Redlands, California, United States09-24 17:30
  9. 1.05 km WNW of Calimesa, California, United States09-26 12:20
  10. 1.06 km S of Loma Linda, California, United States09-27 15:45
  11. 0.99 km NE of Cherry Valley, California, United States09-27 12:45
  12. 0.94 km NW of Cherry Valley, California, United States09-28 05:49
  13. 0.97 km S of Redlands, California, United States09-25 11:38
  14. 0.95 km WNW of Calimesa, California, United States09-24 11:49
  15. 0.8Near Loma Linda, California, United States09-25 23:39
  16. 0.89 km WSW of Beaumont, California, United States09-26 04:38
  17. 0.84 km NW of Cherry Valley, California, United States09-28 05:48
  18. 0.814 km ENE of Banning, California, United States09-27 09:46
  19. 0.8Near Loma Linda, California, United States09-27 23:43
  20. 0.812 km NNE of Banning, California, United States09-28 08:17
  21. 0.86 km S of Loma Linda, California, United States09-27 14:58
  22. 0.76 km NE of Moreno Valley, California, United States09-25 21:51
  23. 0.77 km S of Redlands, California, United States09-25 11:40
  24. 0.77 km WSW of Big Bear Lake, California, United States09-27 22:42
  25. 0.6Near Cherry Valley, California, United States09-24 04:48

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Reports on SeismoAtlas

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Event id ci41338175. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · CI (usgs:ci41338175). Cite as: SeismoAtlas, “M0.8 earthquake near Calimesa, California, United States”, https://seismoatlas.com/earthquake/ci41338175-m0-8-earthquake-near-calimesa-california-united-states, data from USGS.

JSON: /api/v1/events/ci41338175. SeismoAtlas is not an official warning service.