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M1.1 earthquake 7 km NE of Banning, California, United States

A magnitude 1.1 earthquake struck 7 km NE of Banning, California, United States at 14:40 local time (21:40 UTC) on 27 Sept 2026, at a depth of 18 km, according to USGS.

Data: USGS · updated 2026-09-28 13:35 UTC · reviewed

Magnitude
1.1micro
local magnitude (Richter) (ml)
Depth
17.7 km
Status
Reviewed
Origin time
2026-09-27 21:40:01 UTC
Local: 27 Sept 2026, 14:40:01 (America/Los Angeles)
Epicentre
33.978° N, 116.826° 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
BanningCalifornia, United States · pop. 30,9457 kmINot felt
Cherry ValleyCalifornia, United States · pop. 6,36214 kmINot felt
BeaumontCalifornia, United States · pop. 43,81115 kmINot felt
YucaipaCalifornia, United States · pop. 53,32821 kmINot felt
San JacintoCalifornia, United States · pop. 46,95125 kmINot felt
RiversideCalifornia, United States · pop. 317,26153 kmINot felt
IrvineCalifornia, United States · pop. 256,92798 kmINot felt
Santa AnaCalifornia, United States · pop. 310,227100 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 Survey1.1 ml17.7 km33.98° N, 116.83° 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 697 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 18 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 1.5× the energy of M1.0, and its waves are about 1.3× taller on a seismogram. Energy: 697 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

4 later earthquakes within 30 km; the largest was M0.9 22 h ago. 24 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.1

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.040.72
8.150.815
8.160.914
10.630.812
  1. 0.94 km NW of Cherry Valley, California, United States09-28 05:49
  2. 0.84 km NW of Cherry Valley, California, United States09-28 05:48
  3. 0.812 km NNE of Banning, California, United States09-28 08:17
  4. 0.77 km WSW of Big Bear Lake, California, United States09-27 22:42

Did you feel it?

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Reports on SeismoAtlas

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Event id ci41340007. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · CI (usgs:ci41340007). Cite as: SeismoAtlas, “M1.1 earthquake 7 km NE of Banning, California, United States”, https://seismoatlas.com/earthquake/ci41340007-m1-1-earthquake-7-km-ne-of-banning-california-united-states, data from USGS.

JSON: /api/v1/events/ci41340007. SeismoAtlas is not an official warning service.