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M1.1 quarry blast 4 km N of Lake Elsinore, California, United States

A magnitude 1.1 quarry blast struck 4 km N of Lake Elsinore, California, United States at 13:08 local time (20:08 UTC) on 22 Oct 2026, at a depth of 0 km, according to USGS.

revised from M1.4

Data: USGS · updated 2026-10-22 23:43 UTC · reviewed

Magnitude
1.1micro
local magnitude (Richter) (ml)
revised from 1.4
Depth
-0.5 km
Status
Reviewed
Origin time
2026-10-22 20:08:21 UTC
Local: 22 Oct 2026, 13:08:21 (America/Los Angeles)
Epicentre
33.709° N, 117.335° 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
Lake ElsinoreCalifornia, United States · pop. 61,9814 kmIIWeak
Canyon LakeCalifornia, United States · pop. 11,0806 kmINot felt
PerrisCalifornia, United States · pop. 74,97112 kmINot felt
WildomarCalifornia, United States · pop. 35,63213 kmINot felt
MenifeeCalifornia, United States · pop. 87,17417 kmINot felt
RiversideCalifornia, United States · pop. 317,26127 kmINot felt
IrvineCalifornia, United States · pop. 256,92745 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22750 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. Likely felt out to about 2 km.

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 Survey1.1 mlwas 1.4-0.5 km33.71° N, 117.33° 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 801 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 0 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.1 releases about 1.7× the energy of M1.0, and its waves are about 1.4× taller on a seismogram. Energy: 801 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

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

Aftershocks

Mainshock M1.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
22.451.3-1
30.960.715
60.310.76
96.911.4-1
119.910.90
147.111.0-1
166.371.40
190.890.90
204.120.613
275.500.711
313.371.10
335.391.80
360.191.2-1
361.561.40
361.831.60
411.360.917
501.191.19
505.170.91
  1. 1.8Near El Cerrito Corona, California, United States11-05 19:31
  2. 1.64 km ESE of El Cerrito Corona, California, United States11-06 21:57
  3. 1.4Near El Cerrito Corona, California, United States10-29 18:30
  4. 1.43 km ENE of El Cerrito Corona, California, United States10-26 21:03
  5. 1.4Near Home Gardens, California, United States11-06 21:41
  6. 1.3Near El Cerrito Corona, California, United States10-23 18:35
  7. 1.2Near Home Gardens, California, United States11-06 20:20
  8. 1.13 km W of Lake Elsinore, California, United States11-12 17:19
  9. 1.1Near El Cerrito Corona, California, United States11-04 21:30
  10. 1.0Near Home Gardens, California, United States10-28 23:15
  11. 0.99 km NE of Nuevo, California, United States11-08 23:29
  12. 0.9Near Home Gardens, California, United States11-12 21:18
  13. 0.9Near Home Gardens, California, United States10-27 20:03
  14. 0.9Near Home Gardens, California, United States10-30 19:01
  15. 0.7Near Nuevo, California, United States10-25 08:26
  16. 0.74 km N of Murrieta, California, United States10-24 03:05
  17. 0.7Near Lakeland Village, California, United States11-03 07:38
  18. 0.64 km ESE of Moreno Valley, California, United States10-31 08:15

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 ci41350695. First recorded here 22 Oct 2026, 20:11:08 UTC. Solutions: USGS · CI (usgs:ci41350695). Cite as: SeismoAtlas, “M1.1 quarry blast 4 km N of Lake Elsinore, California, United States”, https://seismoatlas.com/earthquake/ci41350695-m1-1-quarry-blast-4-km-n-of-lake-elsinore-california-united-states, data from USGS.

JSON: /api/v1/events/ci41350695. SeismoAtlas is not an official warning service.