M1.6 earthquake 3 km W of Ridgemark, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Tue, Aug 23, 1977, 4:48 PM PDT

UTC

1977-08-23 23:48:40 UTC

Depth

2.0 km (1.2 mi), shallow

Epicenter

36.812° N, 121.411° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.8 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

45°

Stations used

22

• Ridgemark, CaliforniaPopulation 3,016. Forecast4 kmW
• Hollister, CaliforniaPopulation 37,462. Forecast5 kmS
• Salinas, CaliforniaPopulation 157,380. Forecast26 kmNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast420 kmNW

After

1. 2.124 km ENE of Greenfield, CaliforniaWed, Aug 24, 12:34 PM PDT · 17938 days ago · 5 km deep · 59 km away
2. 1.813 km ENE of Gonzales, CaliforniaWed, Aug 24, 1:18 PM PDT · 17938 days ago · 12 km deep · 30 km away
3. 1.52 km W of Cambrian Park, CaliforniaWed, Aug 24, 2:52 PM PDT · 17938 days ago · 8 km deep · 69 km away
4. 3.021 km NE of Soledad, CaliforniaThu, Aug 25, 2:38 AM PDT · 17937 days ago · 6 km deep · 34 km away
5. 2.221 km NE of Soledad, CaliforniaThu, Aug 25, 4:17 AM PDT · 17937 days ago · 6 km deep · 35 km away
6. 1.99 km NW of Hollister, CaliforniaThu, Aug 25, 3:29 PM PDT · 17937 days ago · 6 km deep · 13 km away
7. 2.420 km SSE of Tres Pinos, CaliforniaFri, Aug 26, 7:43 AM PDT · 17936 days ago · 5 km deep · 27 km away
8. 2.07 km NE of Big Sur, CaliforniaFri, Aug 26, 1:57 PM PDT · 17936 days ago · 9 km deep · 63 km away
9. 1.820 km ESE of Tres Pinos, CaliforniaFri, Aug 26, 8:54 PM PDT · 17936 days ago · 0 km deep · 29 km away
10. 2.220 km ESE of Tres Pinos, CaliforniaFri, Aug 26, 9:04 PM PDT · 17936 days ago · 5 km deep · 29 km away
11. 1.820 km NE of Soledad, CaliforniaSat, Aug 27, 5:41 AM PDT · 17935 days ago · 3 km deep · 35 km away
12. 1.929 km NE of Soledad, CaliforniaSat, Aug 27, 4:28 PM PDT · 17935 days ago · 5 km deep · 41 km away
13. 2.78 km NW of Hollister, CaliforniaSun, Aug 28, 4:47 AM PDT · 17934 days ago · 8 km deep · 12 km away
14. 2.915 km SSE of Tres Pinos, CaliforniaMon, Aug 29, 2:10 PM PDT · 17933 days ago · 5 km deep · 21 km away
15. 2.34 km ESE of Aromas, CaliforniaMon, Aug 29, 2:42 PM PDT · 17933 days ago · 5 km deep · 18 km away
16. 3.04 km ESE of Aromas, CaliforniaMon, Aug 29, 3:52 PM PDT · 17933 days ago · 6 km deep · 18 km away
17. 3.03 km ESE of Aromas, CaliforniaMon, Aug 29, 8:53 PM PDT · 17933 days ago · 6 km deep · 19 km away
18. 2.424 km ENE of Greenfield, CaliforniaMon, Aug 29, 10:05 PM PDT · 17933 days ago · 6 km deep · 59 km away
19. 2.217 km SSE of Tres Pinos, CaliforniaTue, Aug 30, 4:09 PM PDT · 17932 days ago · 4 km deep · 23 km away
20. 2.715 km SSE of Tres Pinos, CaliforniaTue, Aug 30, 11:32 PM PDT · 17931 days ago · 5 km deep · 21 km away
21. 2.421 km NE of Soledad, CaliforniaWed, Aug 31, 2:24 AM PDT · 17931 days ago · 2 km deep · 35 km away
22. 2.915 km SSE of Tres Pinos, CaliforniaWed, Aug 31, 2:27 AM PDT · 17931 days ago · 5 km deep · 21 km away
23. 2.024 km ENE of Greenfield, CaliforniaWed, Aug 31, 11:56 AM PDT · 17931 days ago · 5 km deep · 56 km away
24. 1.724 km NE of Greenfield, CaliforniaThu, Sep 1, 9:46 AM PDT · 17930 days ago · 6 km deep · 49 km away
25. 2.718 km SSE of Tres Pinos, CaliforniaThu, Sep 1, 10:58 AM PDT · 17930 days ago · 10 km deep · 24 km away
26. 3.19 km NW of Hollister, CaliforniaFri, Sep 2, 9:24 AM PDT · 17929 days ago · 4 km deep · 13 km away
27. 2.124 km NE of Greenfield, CaliforniaFri, Sep 2, 5:31 PM PDT · 17929 days ago · 5 km deep · 50 km away
28. 1.818 km NE of Tres Pinos, CaliforniaSat, Sep 3, 11:22 AM PDT · 17928 days ago · 5 km deep · 22 km away
29. 1.622 km ENE of Soledad, CaliforniaSat, Sep 3, 11:49 AM PDT · 17928 days ago · 3 km deep · 40 km away
30. 1.917 km SSE of Tres Pinos, CaliforniaSat, Sep 3, 2:09 PM PDT · 17928 days ago · 5 km deep · 23 km away
31. 2.930 km NE of Soledad, CaliforniaSun, Sep 4, 5:33 AM PDT · 17927 days ago · 7 km deep · 42 km away
32. 1.532 km ENE of Soledad, CaliforniaSun, Sep 4, 5:35 AM PDT · 17927 days ago · 9 km deep · 43 km away
33. 2.321 km NE of Soledad, CaliforniaMon, Sep 5, 9:56 AM PDT · 17926 days ago · 7 km deep · 33 km away
34. 2.65 km ENE of East Foothills, CaliforniaTue, Sep 6, 2:55 AM PDT · 17925 days ago · 3 km deep · 73 km away
35. 1.521 km SE of Livermore, CaliforniaTue, Sep 6, 5:30 AM PDT · 17925 days ago · 10 km deep · 84 km away
36. 1.89 km ENE of Milpitas, CaliforniaTue, Sep 6, 1:33 PM PDT · 17925 days ago · 7 km deep · 82 km away
37. 2.224 km NE of Greenfield, CaliforniaTue, Sep 6, 10:10 PM PDT · 17925 days ago · 1 km deep · 52 km away
38. 1.63 km W of San Juan Bautista, CaliforniaWed, Sep 7, 4:21 PM PDT · 17924 days ago · 6 km deep · 15 km away
39. 2.73 km W of San Juan Bautista, CaliforniaWed, Sep 7, 4:54 PM PDT · 17924 days ago · 6 km deep · 16 km away
40. 2.121 km NE of Soledad, CaliforniaWed, Sep 7, 5:04 PM PDT · 17924 days ago · 7 km deep · 40 km away
41. 1.621 km NE of Soledad, CaliforniaWed, Sep 7, 5:12 PM PDT · 17924 days ago · 2 km deep · 32 km away
42. 1.79 km NW of Hollister, CaliforniaWed, Sep 7, 7:27 PM PDT · 17924 days ago · 0 km deep · 13 km away
43. 1.84 km E of Fremont, CaliforniaThu, Sep 8, 1:53 AM PDT · 17923 days ago · 4 km deep · 95 km away
44. 1.79 km NW of Hollister, CaliforniaThu, Sep 8, 4:19 AM PDT · 17923 days ago · 5 km deep · 12 km away
45. 1.59 km NW of Hollister, CaliforniaThu, Sep 8, 7:15 AM PDT · 17923 days ago · 0 km deep · 13 km away
46. 1.910 km NW of Hollister, CaliforniaThu, Sep 8, 1:37 PM PDT · 17923 days ago · 2 km deep · 14 km away
47. 2.79 km NW of Hollister, CaliforniaThu, Sep 8, 11:10 PM PDT · 17922 days ago · 3 km deep · 13 km away
48. 3.09 km NW of Hollister, CaliforniaFri, Sep 9, 4:18 AM PDT · 17922 days ago · 3 km deep · 13 km away
49. 2.39 km NW of Hollister, CaliforniaFri, Sep 9, 6:31 AM PDT · 17922 days ago · 3 km deep · 13 km away
50. 1.810 km NW of Hollister, CaliforniaFri, Sep 9, 1:35 PM PDT · 17922 days ago · 3 km deep · 14 km away
51. 3.18 km SSW of San Juan Bautista, CaliforniaFri, Sep 9, 4:59 PM PDT · 17922 days ago · 9 km deep · 15 km away
52. 1.813 km NW of Big Sur, CaliforniaFri, Sep 9, 5:36 PM PDT · 17922 days ago · 15 km deep · 69 km away
53. 3.022 km ENE of San Lucas, CaliforniaSat, Sep 10, 12:38 AM PDT · 17921 days ago · 6 km deep · 83 km away
54. 1.610 km NW of Hollister, CaliforniaSun, Sep 11, 12:10 AM PDT · 17920 days ago · 2 km deep · 14 km away
55. 1.76 km NNE of Interlaken, CaliforniaSun, Sep 11, 12:19 AM PDT · 17920 days ago · 10 km deep · 34 km away
56. 2.86 km NNE of Interlaken, CaliforniaSun, Sep 11, 12:30 AM PDT · 17920 days ago · 11 km deep · 34 km away
57. 2.05 km SW of Gilroy, CaliforniaSun, Sep 11, 8:36 AM PDT · 17920 days ago · 3 km deep · 25 km away
58. 2.523 km ENE of San Lucas, CaliforniaMon, Sep 12, 2:16 AM PDT · 17919 days ago · 8 km deep · 87 km away
59. 1.821 km ENE of San Lucas, CaliforniaMon, Sep 12, 6:18 AM PDT · 17919 days ago · 7 km deep · 87 km away
60. 1.87 km ENE of Seven Trees, CaliforniaMon, Sep 12, 9:27 AM PDT · 17919 days ago · 6 km deep · 64 km away

The first 60 of 179.

Before

1. 2.01 km WNW of Cambrian Park, CaliforniaSun, Aug 21, 9:06 PM PDT · 17941 days ago · 8 km deep · 69 km away
2. 2.4Central CaliforniaSun, Aug 21, 6:50 AM PDT · 17941 days ago · 5 km deep · 39 km away
3. 1.7Central CaliforniaSat, Aug 20, 10:51 AM PDT · 17942 days ago · 3 km deep · 14 km away
4. 2.324 km NE of Greenfield, CaliforniaFri, Aug 19, 4:13 AM PDT · 17943 days ago · 5 km deep · 54 km away
5. 1.718 km SSE of Tres Pinos, CaliforniaThu, Aug 18, 9:05 PM PDT · 17944 days ago · 6 km deep · 24 km away
6. 2.017 km SSE of Tres Pinos, CaliforniaThu, Aug 18, 4:48 PM PDT · 17944 days ago · 6 km deep · 24 km away
7. 1.76 km NE of East Foothills, CaliforniaThu, Aug 18, 5:04 AM PDT · 17944 days ago · 8 km deep · 74 km away
8. 3.36 km NE of East Foothills, CaliforniaThu, Aug 18, 4:58 AM PDT · 17944 days ago · 7 km deep · 74 km away
9. 1.721 km NNE of Soledad, CaliforniaWed, Aug 17, 11:51 PM PDT · 17944 days ago · 1 km deep · 30 km away
10. 2.42 km WNW of Cambrian Park, CaliforniaWed, Aug 17, 5:41 PM PDT · 17945 days ago · 9 km deep · 70 km away
11. 1.69 km NE of San Juan Bautista, CaliforniaWed, Aug 17, 3:48 PM PDT · 17945 days ago · 10 km deep · 13 km away
12. 1.526 km ENE of Soledad, CaliforniaWed, Aug 17, 2:47 PM PDT · 17945 days ago · 10 km deep · 42 km away
13. 1.524 km SE of Tres Pinos, CaliforniaWed, Aug 17, 8:40 AM PDT · 17945 days ago · 8 km deep · 31 km away
14. 2.05 km S of Tres Pinos, CaliforniaWed, Aug 17, 1:24 AM PDT · 17945 days ago · 8 km deep · 11 km away
15. 1.622 km NE of Soledad, CaliforniaWed, Aug 17, 1:05 AM PDT · 17945 days ago · 7 km deep · 38 km away
16. 2.421 km NE of Soledad, CaliforniaTue, Aug 16, 5:52 PM PDT · 17946 days ago · 2 km deep · 38 km away
17. 1.630 km SE of Tres Pinos, CaliforniaTue, Aug 16, 5:44 PM PDT · 17946 days ago · 10 km deep · 39 km away
18. 1.924 km NE of Greenfield, CaliforniaTue, Aug 16, 10:23 AM PDT · 17946 days ago · 7 km deep · 50 km away
19. 2.618 km E of East Foothills, CaliforniaTue, Aug 16, 7:24 AM PDT · 17946 days ago · 6 km deep · 63 km away
20. 1.56 km ENE of East Foothills, CaliforniaTue, Aug 16, 7:18 AM PDT · 17946 days ago · 6 km deep · 72 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1036462. Read Sun, Oct 4, 2026, 4:58 PM UTC.