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M1.8 earthquake 19 km W of Hidden Valley Lake, California, United States

A magnitude 1.8 earthquake struck 19 km W of Hidden Valley Lake, California, United States at 15:00 local time (22:00 UTC) on 30 Oct 2026, at a depth of 1 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-10-30 22:02 UTC · automatic solution

Magnitude
1.8micro
duration magnitude (md)
Depth
1.4 km
Status
Automatic
Origin time
2026-10-30 22:00:59 UTC
Local: 30 Oct 2026, 15:00:59 (America/Los Angeles)
Epicentre
38.810° N, 122.774° 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
Hidden Valley LakeCalifornia, United States · pop. 5,57919 kmINot felt
ClearlakeCalifornia, United States · pop. 15,18221 kmINot felt
WindsorCalifornia, United States · pop. 27,46429 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12741 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40753 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09060 kmINot felt
SacramentoCalifornia, United States · pop. 524,943114 kmINot felt
San FranciscoCalifornia, United States · pop. 827,526120 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 4 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 Survey1.8 md1.4 km38.81° N, 122.77° W–Automatic

How big was it?

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

It released roughly the energy of 7 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 1 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.8 releases about 15× the energy of M1.0, and its waves are about 6× taller on a seismogram. Energy: 7 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

376 later earthquakes within 30 km; the largest was M2.8 10 days ago. 176 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.290.83
2.091.43
2.121.12
2.941.02
4.050.93
4.381.14
4.380.31
6.240.72
7.261.02
7.560.62
7.650.92
8.580.52
13.781.51
14.700.81
18.140.34
18.261.13
18.311.02
18.320.72
18.590.82
21.390.54
22.621.02
23.260.82
23.280.82
23.820.83
24.051.32
24.541.13
24.850.31
25.040.82
25.051.12
25.271.82
25.870.92
26.680.71
27.970.82
28.530.62
29.410.83
29.941.02
30.071.11
30.080.91
31.691.01
33.020.62
33.261.12
33.551.23
34.000.52
34.330.31
37.390.62
38.650.72
42.011.02
43.130.72
43.490.33
44.231.12
44.621.92
45.010.52
45.391.04
45.820.84
47.890.84
48.020.30
48.900.83
49.940.92
50.501.02
50.750.72
51.710.72
53.221.32
54.271.01
54.611.33
54.821.82
54.960.73
55.021.12
58.171.12
58.170.83
58.931.22
58.931.82
61.360.72
62.540.72
62.781.13
63.201.12
63.420.41
64.620.71
65.232.63
65.280.91
65.300.43
65.320.93
65.370.812
65.391.33
65.780.73
66.820.82
66.901.62
67.070.72
67.331.12
67.590.42
68.481.42
69.010.84
70.552.51
70.572.15
70.741.11
70.961.52
70.972.25
71.022.87
71.380.41
72.230.63
72.391.43
72.641.13
73.550.73
73.590.51
74.261.33
75.780.51
77.090.93
77.990.72
78.230.52
81.001.12
81.440.62
81.991.91
83.191.14
83.820.82
85.740.80
86.400.42
87.870.72
87.872.30
87.882.11
87.881.30
91.040.42
91.471.03
92.191.10
93.801.32
94.240.84
97.160.85
99.310.72
100.010.82
100.431.11
101.421.02
101.580.73
102.001.02
104.160.71
104.381.15
105.870.92
106.870.92
108.860.93
112.140.71
112.910.62
113.090.72
113.930.84
115.770.72
115.851.12
115.921.12
116.021.32
116.300.72
116.760.73
119.990.71
121.300.81
124.711.32
124.980.89
126.151.13
127.440.64
128.471.01
128.641.42
129.811.93
129.820.93
130.901.33
131.680.43
133.441.17
134.150.32
134.370.72
134.750.83
137.580.62
138.990.92
139.130.91
139.560.33
139.821.14
140.130.83
140.501.52
140.670.44
140.820.31
141.470.92
141.880.31
142.620.31
145.930.33
145.960.53
148.461.85
148.591.32
150.111.14
151.050.83
152.460.34
152.590.81
152.640.72
153.400.82
154.030.93
156.170.43
157.201.43
158.971.03
163.180.22
163.741.13
163.771.33
163.781.33
163.820.62
164.060.82
164.161.114
165.911.30
166.211.03
167.470.31
168.200.72
168.751.55
168.841.010
170.790.91
173.080.82
177.061.42
177.521.43
180.421.02
181.050.82
181.500.81
183.241.32
183.362.24
183.540.92
184.651.12
186.230.71
186.811.03
191.311.33
191.530.47
191.631.12
192.170.22
192.290.24
192.531.71
192.990.72
193.231.03
193.600.82
193.841.12
194.541.52
194.550.62
195.410.73
195.541.13
195.550.72
195.782.03
197.040.84
197.120.83
197.310.61
198.630.92
200.150.34
200.591.01
201.360.92
201.621.02
201.661.15
202.160.52
204.511.12
204.920.9-1
205.001.52
205.980.72
207.260.61
208.131.62
208.341.32
209.840.82
212.470.71
212.691.73
212.691.22
212.801.12
213.470.72
215.760.71
215.811.01
216.721.02
217.591.02
217.711.00
218.081.62
218.171.32
218.360.82
218.732.60
219.251.03
219.521.40
219.661.33
219.910.72
220.131.02
220.921.32
221.970.21
222.140.72
222.650.93
223.830.82
224.291.12
224.621.13
229.720.92
230.640.72
231.450.62
232.861.02
234.501.03
235.130.72
235.150.42
236.331.12
236.410.82
236.410.42
236.421.22
236.450.82
237.340.92
238.440.82
238.760.73
239.781.02
240.251.14
240.741.10
241.100.62
241.911.04
244.181.01
244.320.42
244.960.72
246.020.61
247.741.12
248.291.44
248.550.72
248.810.81
249.430.83
249.560.72
253.260.33
253.320.52
254.340.95
255.191.62
255.591.31
257.690.72
258.960.81
261.081.22
261.250.73
264.011.12
265.590.82
265.870.72
267.071.12
267.481.12
269.190.82
269.870.72
270.101.12
271.730.92
273.000.72
274.270.52
274.780.72
276.171.02
276.400.82
276.750.52
278.660.92
278.661.12
279.101.41
279.141.21
281.920.73
282.100.90
282.170.73
282.480.51
282.870.72
283.040.72
284.930.83
287.121.31
287.491.62
288.420.82
289.371.03
290.780.74
291.130.94
292.441.01
293.701.74
294.180.62
295.120.53
295.151.12
297.201.22
297.270.72
297.300.82
297.660.81
298.530.73
300.480.72
300.721.02
300.780.71
300.780.72
302.991.12
303.801.72
304.261.62
305.041.02
306.341.31
307.070.33
307.181.02
307.300.83
307.750.93
308.581.12
309.121.50
309.510.67
309.571.12
312.571.21
312.831.52
313.200.91
314.510.84
  1. 2.811 km NNE of Hidden Valley Lake, California, United States11-02 21:02
  2. 2.618 km E of Cloverdale, California, United States11-02 15:14
  3. 2.618 km W of Hidden Valley Lake, California, United States11-09 00:44
  4. 2.510 km ESE of Clearlake, California, United States11-02 20:34
  5. 2.317 km ENE of Cloverdale, California, United States11-03 13:53
  6. 2.210 km NNE of Hidden Valley Lake, California, United States11-02 20:59
  7. 2.28 km ESE of Cloverdale, California, United States11-07 13:22
  8. 2.110 km NNE of Hidden Valley Lake, California, United States11-02 20:35
  9. 2.117 km ENE of Cloverdale, California, United States11-03 13:53
  10. 2.018 km E of Cloverdale, California, United States11-08 01:47
  11. 1.918 km E of Cloverdale, California, United States11-01 18:37
  12. 1.913 km ENE of Cloverdale, California, United States11-05 07:49
  13. 1.918 km W of Hidden Valley Lake, California, United States11-03 08:00
  14. 1.819 km E of Cloverdale, California, United States11-02 04:50
  15. 1.88 km ESE of Cloverdale, California, United States11-06 02:28
  16. 1.819 km E of Cloverdale, California, United States10-31 23:17
  17. 1.820 km SW of Clearlake, California, United States11-02 08:57
  18. 1.718 km E of Cloverdale, California, United States11-08 18:42
  19. 1.714 km WSW of Hidden Valley Lake, California, United States11-07 22:32
  20. 1.77 km SE of Cloverdale, California, United States11-12 03:43
  21. 1.718 km E of Cloverdale, California, United States11-12 13:48
  22. 1.616 km E of Cloverdale, California, United States11-08 14:08
  23. 1.618 km W of Hidden Valley Lake, California, United States11-12 14:16
  24. 1.616 km W of Hidden Valley Lake, California, United States11-09 00:05
  25. 1.618 km E of Cloverdale, California, United States11-02 16:54

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Reports on SeismoAtlas

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Event id nc75460072. First recorded here 30 Oct 2026, 22:03:22 UTC. Solutions: USGS · NC (usgs:nc75460072). Cite as: SeismoAtlas, “M1.8 earthquake 19 km W of Hidden Valley Lake, California, United States”, https://seismoatlas.com/earthquake/nc75460072-m1-8-earthquake-19-km-w-of-hidden-valley-lake-california-united-states, data from USGS.

JSON: /api/v1/events/nc75460072. SeismoAtlas is not an official warning service.