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M1.1 earthquake 16 km SSE of Mammoth Lakes, California, United States

A magnitude 1.1 earthquake struck 16 km SSE of Mammoth Lakes, California, United States at 04:34 local time (11:34 UTC) on 24 Sept 2026, at a depth of 3 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-24 12:22 UTC · automatic solution

Magnitude
1.1micro
duration magnitude (md)
Depth
2.8 km
Status
Automatic
Origin time
2026-09-24 11:34:56 UTC
Local: 24 Sept 2026, 04:34:56 (America/Los Angeles)
Epicentre
37.514° N, 118.917° 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
Mammoth LakesCalifornia, United States · pop. 7,94616 kmINot felt
ClovisCalifornia, United States · pop. 104,180103 kmINot felt
SangerCalifornia, United States · pop. 24,950106 kmINot felt
ReedleyCalifornia, United States · pop. 25,569112 kmINot felt
FresnoCalifornia, United States · pop. 542,107114 kmINot felt
StocktonCalifornia, United States · pop. 305,658214 kmINot felt
RenoNevada, United States · pop. 264,165237 kmINot felt
BakersfieldCalifornia, United States · pop. 373,640239 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 · NC.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · NCheadlineNorthern California Seismic System via U.S. Geological Survey1.1 md2.8 km37.51° N, 118.92° W–Automatic

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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 773 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 3 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 1.6× the energy of M1.0, and its waves are about 1.4× taller on a seismogram. Energy: 773 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 M1.7 1 day ago. 1 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)
39.391.05
74.581.21
74.611.73
100.431.64
  1. 1.724 km SSE of Mammoth Lakes, California, United States09-27 14:11
  2. 1.623 km SSE of Mammoth Lakes, California, United States09-28 16:00
  3. 1.224 km SSE of Mammoth Lakes, California, United States09-27 14:09
  4. 1.019 km SSE of Mammoth Lakes, California, United States09-26 02:58

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id nc75440797. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · NC (usgs:nc75440797). Cite as: SeismoAtlas, “M1.1 earthquake 16 km SSE of Mammoth Lakes, California, United States”, https://seismoatlas.com/earthquake/nc75440797-m1-1-earthquake-16-km-sse-of-mammoth-lakes-california-united-states, data from USGS.

JSON: /api/v1/events/nc75440797. SeismoAtlas is not an official warning service.