Skip to content
SeismoAtlas

M1.5 earthquake 15 km E of Cloverdale, California, United States

A magnitude 1.5 earthquake struck 15 km E of Cloverdale, California, United States at 02:25 local time (09:25 UTC) on 28 Sept 2026, at a depth of 2 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-28 10:22 UTC · automatic solution

Magnitude
1.5micro
duration magnitude (md)
Depth
2 km
Status
Automatic
Origin time
2026-09-28 09:25:26 UTC
Local: 28 Sept 2026, 02:25:26 (America/Los Angeles)
Epicentre
38.829° N, 122.853° 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
CloverdaleCalifornia, United States · pop. 8,81115 kmINot felt
ClearlakeCalifornia, United States · pop. 15,18224 kmINot felt
WindsorCalifornia, United States · pop. 27,46431 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12745 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40756 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09065 kmINot felt
SacramentoCalifornia, United States · pop. 524,943122 kmINot felt
San FranciscoCalifornia, United States · pop. 827,526124 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 3 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · NCheadlineNorthern California Seismic System via U.S. Geological Survey1.5 md2 km38.83° N, 122.85° W–Automatic

Advertisement

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 3 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 2 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.5 releases about 5.8× the energy of M1.0, and its waves are about 3.2× taller on a seismogram. Energy: 3 kg 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

20 later earthquakes within 30 km; the largest was M2.1 3 h 25 min ago. 209 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.770.82
1.260.34
1.370.83
1.890.82
3.100.83
4.120.83
6.390.71
6.900.72
6.900.72
7.211.63
8.520.82
8.841.12
9.190.51
9.570.62
10.922.11
10.940.61
10.940.80
10.940.80
11.021.40
11.820.73
  1. 2.116 km ENE of Cloverdale, California, United States09-28 20:20
  2. 1.620 km E of Cloverdale, California, United States09-28 16:37
  3. 1.416 km ENE of Cloverdale, California, United States09-28 20:26
  4. 1.119 km E of Cloverdale, California, United States09-28 18:15
  5. 0.819 km W of Hidden Valley Lake, California, United States09-28 13:32
  6. 0.819 km E of Cloverdale, California, United States09-28 11:19
  7. 0.816 km ENE of Cloverdale, California, United States09-28 20:22
  8. 0.819 km E of Cloverdale, California, United States09-28 10:47
  9. 0.814 km E of Cloverdale, California, United States09-28 17:56
  10. 0.816 km ENE of Cloverdale, California, United States09-28 20:21
  11. 0.819 km E of Cloverdale, California, United States09-28 10:11
  12. 0.819 km E of Cloverdale, California, United States09-28 12:31
  13. 0.718 km ENE of Cloverdale, California, United States09-28 15:48
  14. 0.718 km E of Cloverdale, California, United States09-28 21:14
  15. 0.719 km SW of Clearlake, California, United States09-28 16:19
  16. 0.719 km SW of Clearlake, California, United States09-28 16:19
  17. 0.617 km ENE of Cloverdale, California, United States09-28 20:21
  18. 0.619 km SW of Clearlake, California, United States09-28 18:59
  19. 0.520 km E of Cloverdale, California, United States09-28 18:36
  20. 0.315 km ENE of Cloverdale, California, United States09-28 10:41

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?

Anonymous. No account, no cookies. A short automatic check runs in your browser instead of a third-party captcha.

Reports on SeismoAtlas

No reports yet.

Event id nc75443732. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · NC (usgs:nc75443732). Cite as: SeismoAtlas, “M1.5 earthquake 15 km E of Cloverdale, California, United States”, https://seismoatlas.com/earthquake/nc75443732-m1-5-earthquake-15-km-e-of-cloverdale-california-united-states, data from USGS.

JSON: /api/v1/events/nc75443732. SeismoAtlas is not an official warning service.