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SeismoAtlas

M0.9 earthquake 4 km SE of Yorba Linda, California, United States

A magnitude 0.9 earthquake struck 4 km SE of Yorba Linda, California, United States at 02:05 local time (09:05 UTC) on 5 Oct 2026, at a depth of 9 km, according to USGS.

revised from M1.0

Data: USGS · updated 2026-10-05 13:37 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
revised from 1.0
Depth
9.4 km
Status
Reviewed
Origin time
2026-10-05 09:05:01 UTC
Local: 5 Oct 2026, 02:05:01 (America/Los Angeles)
Epicentre
33.864° N, 117.775° 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
Yorba LindaCalifornia, United States · pop. 67,9734 kmINot felt
Villa ParkCalifornia, United States · pop. 5,9647 kmINot felt
PlacentiaCalifornia, United States · pop. 52,4959 kmINot felt
OrangeCalifornia, United States · pop. 140,99211 kmINot felt
North TustinCalifornia, United States · pop. 24,91712 kmINot felt
AnaheimCalifornia, United States · pop. 350,74213 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22715 kmINot felt
IrvineCalifornia, United States · pop. 256,92722 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 Survey0.9 mlwas 1.09.4 km33.86° N, 117.77° 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 326 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 9 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 1.5× the energy of M0.9, and its waves are about 1.3× taller on a seismogram. Energy: 477 g of TNT vs 326 g of TNT.

Each square is the energy of one M0.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

27 later earthquakes within 30 km; the largest was M1.8 8 days ago. 11 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
34.670.36
62.560.30
95.300.75
108.731.75
108.771.50
222.231.210
227.091.70
274.851.22
275.641.04
331.060.613
370.531.1-1
441.511.3-1
459.551.513
472.931.212
487.191.48
499.691.18
515.971.4-1
535.190.98
538.970.90
566.171.0-1
585.421.40
593.361.37
609.940.90
621.650.913
623.801.09
712.481.511
716.201.810
  1. 1.85 km ESE of Yorba Linda, California, United States11-04 05:16
  2. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  3. 1.7Near El Cerrito Corona, California, United States10-14 20:10
  4. 1.5Near Placentia, California, United States11-04 01:33
  5. 1.54 km ESE of El Cerrito Corona, California, United States10-09 21:51
  6. 1.53 km ESE of Huntington Beach, California, United States10-24 12:37
  7. 1.4Near El Cerrito Corona, California, United States10-29 18:30
  8. 1.43 km ENE of El Cerrito Corona, California, United States10-26 21:03
  9. 1.46 km NW of Jurupa Valley, California, United States10-25 16:16
  10. 1.37 km NNW of Eastvale, California, United States10-30 02:26
  11. 1.3Near El Cerrito Corona, California, United States10-23 18:35
  12. 1.2Near El Cerrito Corona, California, United States10-16 19:55
  13. 1.2Near Stanton, California, United States10-25 02:00
  14. 1.24 km SSW of Yorba Linda, California, United States10-14 15:18
  15. 1.1Near Home Gardens, California, United States10-20 19:36
  16. 1.1Near Anaheim, California, United States10-26 04:46
  17. 1.011 km SW of Corona, California, United States10-16 20:43
  18. 1.0Near Home Gardens, California, United States10-28 23:15
  19. 1.04 km N of Jurupa Valley, California, United States10-31 08:53
  20. 0.94 km S of San Dimas, California, United States10-31 06:44
  21. 0.9Near Home Gardens, California, United States10-27 20:03
  22. 0.99 km S of Los Serranos, California, United States10-27 16:16
  23. 0.9Near Home Gardens, California, United States10-30 19:01
  24. 0.77 km WNW of Jurupa Valley, California, United States10-09 08:22
  25. 0.6Near Covina, California, United States10-19 04:08

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 ci41343407. First recorded here 5 Oct 2026, 09:07:58 UTC. Solutions: USGS · CI (usgs:ci41343407). Cite as: SeismoAtlas, “M0.9 earthquake 4 km SE of Yorba Linda, California, United States”, https://seismoatlas.com/earthquake/ci41343407-m0-9-earthquake-4-km-se-of-yorba-linda-california-united-states, data from USGS.

JSON: /api/v1/events/ci41343407. SeismoAtlas is not an official warning service.