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M2.5 earthquake 10 km NE of Agua Caliente, California, United States

A magnitude 2.5 earthquake struck 10 km NE of Agua Caliente, California, United States at 09:06 local time (16:06 UTC) on 29 Sept 2026, at a depth of 8 km, according to USGS.

revised from M2.6 · 51 reports to USGS “Did You Feel It?”

Data: USGS · updated 2026-10-12 17:54 UTC · reviewed

Magnitude
2.5micro
duration magnitude (md)
revised from 2.6
Depth
7.9 km
Status
Reviewed
Origin time
2026-09-29 16:06:37 UTC
Local: 29 Sept 2026, 09:06:37 (America/Los Angeles)
Epicentre
38.398° N, 122.424° W

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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
Agua CalienteCalifornia, United States · pop. 27,09010 kmIIWeak
Boyes Hot SpringsCalifornia, United States · pop. 6,65611 kmIIWeak
NapaCalifornia, United States · pop. 80,43416 kmIIWeak
Rohnert ParkCalifornia, United States · pop. 42,40725 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12725 kmINot felt
OaklandCalifornia, United States · pop. 419,26768 kmINot felt
San FranciscoCalifornia, United States · pop. 827,52670 kmINot felt
SacramentoCalifornia, United States · pop. 524,94384 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 5 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 · NC, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · NCheadlineNorthern California Seismic System via U.S. Geological Survey2.5 mdwas 2.67.9 km38.40° N, 122.42° W–Reviewed · 1 revision

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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 88 kg 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 8 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.5 releases about 33× the energy of M1.5, and its waves are about 10× taller on a seismogram. Energy: 88 kg of TNT vs 3 kg of TNT.

Each square is the energy of one M1.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

10 later earthquakes within 30 km; the largest was M2.4 6 days ago. 4 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.682.00
38.111.87
77.942.4-1
132.001.47
143.171.56
156.881.26
169.682.40
268.912.10
278.851.60
282.421.90
  1. 2.46 km SE of Napa, California, United States10-06 17:47
  2. 2.46 km WNW of Petaluma, California, United States10-02 22:02
  3. 2.17 km N of Saint Helena, California, United States10-10 21:01
  4. 2.08 km WSW of Calistoga, California, United States09-29 18:47
  5. 1.912 km NW of Agua Caliente, California, United States10-11 10:31
  6. 1.84 km S of Larkfield-Wikiup, California, United States10-01 06:13
  7. 1.68 km NNE of Saint Helena, California, United States10-11 06:57
  8. 1.513 km NNE of Napa, California, United States10-05 15:17
  9. 1.411 km SSE of Saint Helena, California, United States10-05 04:06
  10. 1.214 km NE of Napa, California, United States10-06 04:59

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

How strong was the shaking where you were?

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Reports on SeismoAtlas

No reports yet.

USGS “Did You Feel It?” has 51 reports: add yours at USGS.

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Event id nc75444432. First recorded here 29 Sept 2026, 16:08:56 UTC. Solutions: USGS · NC (usgs:nc75444432). Cite as: SeismoAtlas, “M2.5 earthquake 10 km NE of Agua Caliente, California, United States”, https://seismoatlas.com/earthquake/nc75444432-m2-5-earthquake-10-km-ne-of-agua-caliente-california-united-states, data from USGS.

JSON: /api/v1/events/nc75444432. SeismoAtlas is not an official warning service.