M1.8 earthquake 5 km NE of Ridgemark, California

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Jul 23, 1975, 1:01 PM PDT

UTC

1975-07-23 20:01:56 UTC

Depth

5.7 km (3.5 mi), shallow

Epicenter

36.843° N, 121.317° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.11

Depth from

From location

Station coverage gap

71°

Stations used

31

• Ridgemark, CaliforniaPopulation 3,016. Forecast5 kmNE
• Hollister, CaliforniaPopulation 37,462. Forecast8 kmE
• Salinas, CaliforniaPopulation 157,380. Forecast35 kmENE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast417 kmNW

After

1. 3.35 km SSW of Gilroy, CaliforniaWed, Jul 23, 1:59 PM PDT · 18700 days ago · 5 km deep · 27 km away
2. 2.725 km NE of Hollister, CaliforniaWed, Jul 23, 3:35 PM PDT · 18700 days ago · 2 km deep · 22 km away
3. 2.112 km SE of Tres Pinos, CaliforniaWed, Jul 23, 4:09 PM PDT · 18700 days ago · 6 km deep · 17 km away
4. 2.19 km NE of San Juan Bautista, CaliforniaWed, Jul 23, 11:44 PM PDT · 18699 days ago · 2 km deep · 16 km away
5. 1.79 km NNE of Milpitas, CaliforniaThu, Jul 24, 1:02 AM PDT · 18699 days ago · 10 km deep · 87 km away
6. 3.0Central CaliforniaThu, Jul 24, 5:05 AM PDT · 18699 days ago · 4 km deep · 27 km away
7. 2.827 km SE of Tres Pinos, CaliforniaThu, Jul 24, 8:32 AM PDT · 18699 days ago · 6 km deep · 32 km away
8. 2.210 km S of Tres Pinos, CaliforniaThu, Jul 24, 10:36 AM PDT · 18699 days ago · 7 km deep · 16 km away
9. 3.118 km SSE of Tres Pinos, CaliforniaThu, Jul 24, 1:16 PM PDT · 18699 days ago · 6 km deep · 24 km away
10. 2.218 km SSE of Tres Pinos, CaliforniaThu, Jul 24, 1:43 PM PDT · 18699 days ago · 7 km deep · 24 km away
11. 2.34 km WSW of Gilroy, CaliforniaThu, Jul 24, 6:34 PM PDT · 18698 days ago · 7 km deep · 31 km away
12. 2.421 km NE of Soledad, CaliforniaThu, Jul 24, 11:15 PM PDT · 18698 days ago · 6 km deep · 35 km away
13. 1.58 km S of Livermore, CaliforniaFri, Jul 25, 4:21 AM PDT · 18698 days ago · 7 km deep · 93 km away
14. 2.823 km ENE of Soledad, CaliforniaFri, Jul 25, 5:56 AM PDT · 18698 days ago · 7 km deep · 45 km away
15. 2.09 km ENE of Tres Pinos, CaliforniaFri, Jul 25, 9:04 PM PDT · 18697 days ago · 7 km deep · 9 km away
16. 3.122 km W of Coalinga, CaliforniaSat, Jul 26, 4:08 AM PDT · 18697 days ago · 7 km deep · 99 km away
17. 1.934 km ENE of Soledad, CaliforniaSat, Jul 26, 4:14 AM PDT · 18697 days ago · 5 km deep · 44 km away
18. 3.118 km SSE of Tres Pinos, CaliforniaSun, Jul 27, 2:08 PM PDT · 18696 days ago · 10 km deep · 24 km away
19. 1.528 km ESE of Tres Pinos, CaliforniaMon, Jul 28, 12:45 AM PDT · 18695 days ago · 0 km deep · 29 km away
20. 2.810 km NNW of Hollister, CaliforniaMon, Jul 28, 12:48 AM PDT · 18695 days ago · 2 km deep · 15 km away
21. 2.323 km NE of King City, CaliforniaMon, Jul 28, 2:45 PM PDT · 18695 days ago · 7 km deep · 60 km away
22. 2.51 km E of Ridgemark, CaliforniaMon, Jul 28, 7:00 PM PDT · 18694 days ago · 7 km deep · 4 km away
23. 2.26 km NNE of Interlaken, CaliforniaTue, Jul 29, 6:27 AM PDT · 18694 days ago · 11 km deep · 39 km away
24. 3.95 km SSE of San Juan Bautista, CaliforniaTue, Jul 29, 9:15 PM PDT · 18693 days ago · 5 km deep · 18 km away
25. 3.09 km SSW of Tres Pinos, CaliforniaWed, Jul 30, 4:11 PM PDT · 18693 days ago · 3 km deep · 15 km away
26. 2.97 km ENE of Gilroy, CaliforniaThu, Jul 31, 6:37 AM PDT · 18692 days ago · 7 km deep · 27 km away
27. 3.53 km WSW of San Juan Bautista, CaliforniaFri, Aug 1, 5:23 AM PDT · 18691 days ago · 7 km deep · 22 km away
28. 2.28 km NW of Hollister, CaliforniaSat, Aug 2, 4:54 PM PDT · 18690 days ago · 6 km deep · 15 km away
29. 4.58 km S of Three Rocks, CaliforniaSat, Aug 2, 4:56 PM PDT · 18690 days ago · 17 km deep · 94 km away
30. 4.47 km S of Three Rocks, CaliforniaSat, Aug 2, 8:30 PM PDT · 18689 days ago · 17 km deep · 94 km away
31. 3.06 km S of Three Rocks, CaliforniaSat, Aug 2, 9:30 PM PDT · 18689 days ago · 11 km deep · 95 km away
32. 4.07 km S of Three Rocks, CaliforniaSat, Aug 2, 10:57 PM PDT · 18689 days ago · 13 km deep · 94 km away
33. 3.95 km S of Three Rocks, CaliforniaSat, Aug 2, 11:04 PM PDT · 18689 days ago · 10 km deep · 94 km away
34. 4.27 km S of Three Rocks, CaliforniaSat, Aug 2, 11:07 PM PDT · 18689 days ago · 17 km deep · 93 km away
35. 3.76 km S of Three Rocks, CaliforniaSat, Aug 2, 11:08 PM PDT · 18689 days ago · 17 km deep · 93 km away
36. 3.95 km S of Three Rocks, CaliforniaSat, Aug 2, 11:11 PM PDT · 18689 days ago · 14 km deep · 93 km away
37. 4.97 km SW of Three Rocks, CaliforniaSat, Aug 2, 11:35 PM PDT · 18689 days ago · 17 km deep · 89 km away
38. 4.14 km SW of Cantua Creek, CaliforniaSat, Aug 2, 11:37 PM PDT · 18689 days ago · 5 km deep · 96 km away
39. 2.94 km S of Three Rocks, CaliforniaSat, Aug 2, 11:43 PM PDT · 18689 days ago · 12 km deep · 93 km away
40. 3.63 km S of Three Rocks, CaliforniaSat, Aug 2, 11:47 PM PDT · 18689 days ago · 10 km deep · 92 km away
41. 4.63 km SSW of Three Rocks, CaliforniaSat, Aug 2, 11:48 PM PDT · 18689 days ago · 11 km deep · 92 km away
42. 3.08 km SSE of Three Rocks, CaliforniaSat, Aug 2, 11:49 PM PDT · 18689 days ago · 10 km deep · 96 km away
43. 3.96 km S of Three Rocks, CaliforniaSun, Aug 3, 12:11 AM PDT · 18689 days ago · 9 km deep · 94 km away
44. 3.65 km SSE of Three Rocks, CaliforniaSun, Aug 3, 12:27 AM PDT · 18689 days ago · 9 km deep · 94 km away
45. 3.62 km SSE of Three Rocks, CaliforniaSun, Aug 3, 12:40 AM PDT · 18689 days ago · 8 km deep · 93 km away
46. 4.15 km S of Three Rocks, CaliforniaSun, Aug 3, 12:59 AM PDT · 18689 days ago · 7 km deep · 94 km away
47. 3.68 km SSE of Three Rocks, CaliforniaSun, Aug 3, 1:37 AM PDT · 18689 days ago · 9 km deep · 96 km away
48. 3.58 km S of Three Rocks, CaliforniaSun, Aug 3, 2:00 AM PDT · 18689 days ago · 10 km deep · 96 km away
49. 3.25 km SSE of Three Rocks, CaliforniaSun, Aug 3, 2:57 AM PDT · 18689 days ago · 11 km deep · 95 km away
50. 3.57 km S of Three Rocks, CaliforniaSun, Aug 3, 3:14 AM PDT · 18689 days ago · 15 km deep · 95 km away
51. 2.4Central CaliforniaSun, Aug 3, 5:00 AM PDT · 18689 days ago · 4 km deep · 19 km away
52. 1.613 km S of Tres Pinos, CaliforniaSun, Aug 3, 5:03 AM PDT · 18689 days ago · 5 km deep · 19 km away
53. 2.98 km SSE of Three Rocks, CaliforniaSun, Aug 3, 5:47 AM PDT · 18689 days ago · 3 km deep · 97 km away
54. 3.07 km S of Three Rocks, CaliforniaSun, Aug 3, 6:46 AM PDT · 18689 days ago · 18 km deep · 95 km away
55. 3.5Central CaliforniaSun, Aug 3, 6:46 AM PDT · 18689 days ago · 11 km deep · 94 km away
56. 3.18 km S of Three Rocks, CaliforniaSun, Aug 3, 7:01 AM PDT · 18689 days ago · 15 km deep · 94 km away
57. 3.84 km S of Three Rocks, CaliforniaSun, Aug 3, 9:00 AM PDT · 18689 days ago · 9 km deep · 92 km away
58. 3.58 km SSE of Three Rocks, CaliforniaSun, Aug 3, 9:55 AM PDT · 18689 days ago · 17 km deep · 97 km away
59. 4.46 km S of Three Rocks, CaliforniaSun, Aug 3, 9:58 AM PDT · 18689 days ago · 11 km deep · 93 km away
60. 3.06 km S of Three Rocks, CaliforniaSun, Aug 3, 3:39 PM PDT · 18689 days ago · 11 km deep · 93 km away

The first 60 of 188.

Before

1. 3.026 km ENE of San Lucas, CaliforniaWed, Jul 23, 7:06 AM PDT · 18700 days ago · 5 km deep · 84 km away
2. 2.42 km W of San Juan Bautista, CaliforniaTue, Jul 22, 11:30 AM PDT · 18701 days ago · 6 km deep · 22 km away
3. 1.521 km NE of Soledad, CaliforniaTue, Jul 22, 8:49 AM PDT · 18701 days ago · 3 km deep · 34 km away
4. 1.613 km S of Tres Pinos, CaliforniaTue, Jul 22, 7:43 AM PDT · 18701 days ago · 4 km deep · 19 km away
5. 2.125 km ENE of Greenfield, CaliforniaTue, Jul 22, 4:14 AM PDT · 18701 days ago · 5 km deep · 53 km away
6. 2.314 km E of Seven Trees, CaliforniaTue, Jul 22, 12:01 AM PDT · 18701 days ago · 1 km deep · 59 km away
7. 2.06 km SSE of Tres Pinos, CaliforniaMon, Jul 21, 7:31 PM PDT · 18701 days ago · 2 km deep · 12 km away
8. 1.5Central CaliforniaMon, Jul 21, 7:06 PM PDT · 18701 days ago · 4 km deep · 18 km away
9. 3.523 km NNE of San Lucas, CaliforniaMon, Jul 21, 2:55 AM PDT · 18702 days ago · 4 km deep · 71 km away
10. 2.49 km NW of Hollister, CaliforniaSun, Jul 20, 12:10 PM PDT · 18703 days ago · 6 km deep · 16 km away
11. 2.87 km WSW of Gilroy, CaliforniaSat, Jul 19, 5:00 PM PDT · 18704 days ago · 4 km deep · 32 km away
12. 2.027 km NE of Soledad, CaliforniaSat, Jul 19, 10:49 AM PDT · 18704 days ago · 7 km deep · 34 km away
13. 2.79 km NW of Hollister, CaliforniaSat, Jul 19, 12:20 AM PDT · 18704 days ago · 7 km deep · 15 km away
14. 3.622 km NNE of Soledad, CaliforniaFri, Jul 18, 2:40 PM PDT · 18705 days ago · 3 km deep · 29 km away
15. 2.813 km ESE of Alum Rock, CaliforniaFri, Jul 18, 1:22 AM PDT · 18705 days ago · 8 km deep · 62 km away
16. 2.624 km NE of King City, CaliforniaThu, Jul 17, 5:42 AM PDT · 18706 days ago · 3 km deep · 60 km away
17. 2.79 km WSW of Ridgemark, CaliforniaThu, Jul 17, 4:06 AM PDT · 18706 days ago · 6 km deep · 15 km away
18. 2.09 km NW of Hollister, CaliforniaThu, Jul 17, 12:59 AM PDT · 18706 days ago · 4 km deep · 16 km away
19. 2.49 km ESE of East Foothills, CaliforniaWed, Jul 16, 5:16 PM PDT · 18707 days ago · 2 km deep · 67 km away
20. 2.824 km NE of Greenfield, CaliforniaWed, Jul 16, 4:12 PM PDT · 18707 days ago · 0 km deep · 50 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1024885. Read Sat, Oct 3, 2026, 12:48 PM UTC.