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SeismoAtlas

M2.5 earthquake 13 km WSW of Hidden Valley Lake, California, United States

A magnitude 2.5 earthquake struck 13 km WSW of Hidden Valley Lake, California, United States at 13:48 local time (20:48 UTC) on 30 Sept 2026, at a depth of 2 km, according to USGS.

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

Data: USGS · updated 2026-10-12 08:20 UTC · reviewed

Magnitude
2.5micro
duration magnitude (md)
revised from 2.6
Depth
2.4 km
Status
Reviewed
Origin time
2026-09-30 20:48:14 UTC
Local: 30 Sept 2026, 13:48:14 (America/Los Angeles)
Epicentre
38.764° N, 122.698° 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
Hidden Valley LakeCalifornia, United States · pop. 5,57913 kmIIWeak
ClearlakeCalifornia, United States · pop. 15,18223 kmINot felt
WindsorCalifornia, United States · pop. 27,46426 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12736 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40747 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09053 kmINot felt
SacramentoCalifornia, United States · pop. 524,943107 kmINot felt
San FranciscoCalifornia, United States · pop. 827,526113 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 9 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 2.62.4 km38.76° N, 122.70° 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 94 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.

M2.5 releases about 35× the energy of M1.5, and its waves are about 11× taller on a seismogram. Energy: 94 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

359 later earthquakes within 30 km; the largest was M2.9 11 days ago. 252 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.5

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.021.23
0.322.95
0.402.25
0.461.44
0.521.76
1.351.14
1.531.33
5.150.83
5.161.23
6.441.22
7.701.72
7.981.23
8.011.01
8.910.51
10.260.73
10.361.92
10.371.42
10.390.72
10.410.72
10.701.12
11.131.35
11.390.82
11.420.82
11.480.42
11.701.44
11.961.03
12.100.21
12.270.83
13.050.22
16.011.75
17.591.13
19.750.82
20.111.02
20.281.12
20.360.91
22.221.13
22.581.12
22.711.23
23.000.61
23.120.63
23.950.71
23.991.12
24.390.21
24.620.72
25.291.33
25.471.73
25.711.43
28.551.93
30.381.12
30.381.51
31.071.55
33.340.82
33.790.72
34.900.72
35.281.12
35.330.82
35.601.62
36.790.72
37.290.73
37.871.41
38.020.73
39.150.33
40.310.72
43.001.13
43.090.82
43.890.42
44.031.04
44.531.12
45.511.03
46.750.52
48.311.02
49.090.72
49.301.11
49.301.11
49.310.91
50.660.53
51.600.72
57.351.12
57.440.88
57.460.52
57.700.22
58.640.72
58.980.83
59.750.71
61.202.22
61.202.02
61.771.12
61.790.82
61.801.32
62.001.02
62.181.12
63.750.82
64.362.02
64.531.12
65.040.82
65.890.6-1
66.061.32
66.130.83
66.931.13
67.271.13
67.741.13
68.610.61
68.781.12
71.540.53
72.001.83
72.421.36
72.511.13
72.661.56
73.451.22
74.510.72
76.371.12
76.440.24
76.730.72
77.961.12
78.021.03
79.441.12
80.430.83
80.971.10
81.000.72
82.110.72
82.381.61
84.690.82
84.851.12
86.640.82
87.460.73
88.160.22
88.290.82
89.111.02
93.151.53
93.290.83
94.190.87
94.341.12
95.090.9-1
95.130.32
95.980.84
96.630.73
97.100.82
97.691.02
97.811.03
99.541.02
99.940.72
100.080.72
101.660.42
102.380.82
103.230.72
103.920.82
104.570.710
106.300.83
106.851.32
106.941.02
108.471.02
109.451.62
109.540.72
110.521.03
110.951.64
114.050.31
114.190.73
114.680.22
116.001.42
116.160.71
116.471.03
117.280.72
117.281.12
125.900.72
126.101.10
126.731.12
127.640.81
128.150.92
128.560.72
130.230.83
130.740.83
130.901.20
131.291.01
132.420.81
132.561.11
132.791.01
134.591.33
135.450.82
136.540.32
138.701.12
140.620.33
140.971.52
141.571.43
141.691.03
141.830.92
142.891.14
144.951.21
146.580.72
147.591.31
147.670.73
147.880.73
148.670.72
149.601.32
150.601.12
150.830.53
152.011.42
152.020.73
152.410.22
152.561.02
153.022.09
153.110.74
153.970.71
153.980.62
154.180.42
154.280.83
154.471.12
154.861.32
155.921.91
155.950.80
157.360.60
158.081.11
159.411.12
160.261.86
161.141.04
161.170.73
162.641.12
162.721.12
163.800.72
165.530.92
165.570.72
166.071.12
168.071.11
168.691.13
168.880.52
170.420.81
170.491.33
172.110.82
172.841.11
174.151.33
175.681.7-1
175.761.23
177.590.52
179.001.13
179.221.03
181.681.31
185.531.33
185.640.83
186.161.26
186.261.43
189.100.72
189.170.94
190.300.73
190.641.13
192.860.80
193.930.83
194.160.90
195.270.92
195.272.33
195.491.82
195.520.83
196.221.12
196.240.83
197.041.02
197.480.73
197.612.03
198.511.33
198.551.12
200.141.53
201.860.21
201.991.11
202.350.31
203.131.01
203.250.92
203.350.72
203.471.12
204.480.42
204.740.82
207.851.11
207.871.30
208.111.01
209.861.32
212.000.42
212.340.92
214.071.33
215.290.82
215.810.93
216.580.72
216.620.73
216.831.02
217.171.12
217.981.13
218.021.12
218.030.82
218.600.72
220.350.80
220.870.42
222.490.82
224.611.02
225.420.53
225.491.13
225.551.12
226.680.52
228.170.53
229.150.82
229.210.73
229.781.12
230.940.83
232.661.12
232.691.12
232.710.82
233.851.73
233.860.73
235.220.92
235.590.43
238.730.312
239.921.81
240.222.10
240.321.82
241.380.72
242.150.83
242.540.82
246.321.61
247.581.82
248.080.72
248.090.87
248.531.02
248.681.13
251.540.72
253.411.12
253.880.72
254.820.72
255.371.02
255.401.10
256.271.11
256.371.01
257.020.92
257.301.72
257.320.92
257.431.52
257.460.22
259.430.82
259.741.42
262.701.01
262.710.43
264.760.72
264.870.82
265.130.83
265.261.12
265.761.11
265.870.92
266.521.22
267.290.22
267.550.73
268.050.82
268.921.12
269.130.83
270.050.63
270.411.02
270.761.02
273.111.11
273.111.22
273.830.72
274.750.82
275.950.82
276.680.72
279.180.82
280.801.93
280.820.93
280.910.83
  1. 2.98 km ESE of Cloverdale, California, United States09-30 21:07
  2. 2.318 km E of Cloverdale, California, United States10-09 00:04
  3. 2.29 km ESE of Cloverdale, California, United States09-30 21:12
  4. 2.216 km ENE of Cloverdale, California, United States10-03 10:00
  5. 2.17 km N of Saint Helena, California, United States10-10 21:01
  6. 2.016 km E of Cloverdale, California, United States10-07 05:49
  7. 2.016 km ENE of Cloverdale, California, United States10-03 10:00
  8. 2.019 km E of Cloverdale, California, United States10-09 02:24
  9. 2.018 km E of Cloverdale, California, United States10-03 13:09
  10. 1.920 km E of Cloverdale, California, United States10-12 13:36
  11. 1.918 km E of Cloverdale, California, United States10-01 07:09
  12. 1.916 km E of Cloverdale, California, United States10-02 01:21
  13. 1.916 km WSW of Hidden Valley Lake, California, United States10-07 08:43
  14. 1.818 km E of Cloverdale, California, United States10-09 00:17
  15. 1.820 km E of Cloverdale, California, United States10-03 20:48
  16. 1.814 km NNE of Calistoga, California, United States10-07 13:03
  17. 1.816 km WSW of Hidden Valley Lake, California, United States10-10 21:07
  18. 1.817 km W of Hidden Valley Lake, California, United States10-10 20:43
  19. 1.818 km W of Hidden Valley Lake, California, United States10-11 04:23
  20. 1.719 km E of Cloverdale, California, United States10-10 14:39
  21. 1.719 km W of Hidden Valley Lake, California, United States10-01 22:16
  22. 1.79 km ESE of Cloverdale, California, United States09-30 21:19
  23. 1.718 km E of Cloverdale, California, United States10-11 14:06
  24. 1.718 km E of Cloverdale, California, United States10-08 04:28
  25. 1.714 km WSW of Hidden Valley Lake, California, United States10-01 04:30

Did you feel it?

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Reports on SeismoAtlas

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USGS “Did You Feel It?” has 6 reports: add yours at USGS.

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Event id nc75441981. First recorded here 30 Sept 2026, 20:49:59 UTC. Solutions: USGS · NC (usgs:nc75441981). Cite as: SeismoAtlas, “M2.5 earthquake 13 km WSW of Hidden Valley Lake, California, United States”, https://seismoatlas.com/earthquake/nc75441981-m2-5-earthquake-13-km-wsw-of-hidden-valley-lake-california-united-states, data from USGS.

JSON: /api/v1/events/nc75441981. SeismoAtlas is not an official warning service.