M2.6 earthquake 5 km NNE of Ridgemark, California

Magnitude

2.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Aug 18, 1983, 2:00 AM PDT

UTC

1983-08-18 09:00:46 UTC

Depth

6.0 km (3.7 mi), shallow

Epicenter

36.858° N, 121.334° 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

±0.15

Depth from

From location

Station coverage gap

41°

Stations used

55

• Ridgemark, CaliforniaPopulation 3,016. Forecast6 kmNNE
• Hollister, CaliforniaPopulation 37,462. Forecast6 kmE
• Salinas, CaliforniaPopulation 157,380. Forecast35 kmNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast419 kmNW

After

1. 1.65 km NNE of Ridgemark, CaliforniaThu, Aug 18, 2:11 AM PDT · 15751 days ago · 4 km deep · 0 km away
2. 2.25 km NNE of Ridgemark, CaliforniaThu, Aug 18, 2:48 AM PDT · 15751 days ago · 5 km deep · 0 km away
3. 1.824 km NE of Greenfield, CaliforniaThu, Aug 18, 5:05 AM PDT · 15751 days ago · 4 km deep · 49 km away
4. 1.825 km ENE of Greenfield, CaliforniaThu, Aug 18, 4:02 PM PDT · 15750 days ago · 5 km deep · 55 km away
5. 1.824 km ENE of Greenfield, CaliforniaThu, Aug 18, 4:05 PM PDT · 15750 days ago · 6 km deep · 56 km away
6. 1.525 km WNW of Coalinga, CaliforniaThu, Aug 18, 4:37 PM PDT · 15750 days ago · 4 km deep · 97 km away
7. 1.717 km SSE of Tres Pinos, CaliforniaThu, Aug 18, 7:45 PM PDT · 15750 days ago · 5 km deep · 25 km away
8. 2.414 km SSE of Tres Pinos, CaliforniaThu, Aug 18, 8:20 PM PDT · 15750 days ago · 10 km deep · 22 km away
9. 3.314 km SSE of Tres Pinos, CaliforniaThu, Aug 18, 8:22 PM PDT · 15750 days ago · 10 km deep · 22 km away
10. 1.611 km SSE of Livermore, CaliforniaFri, Aug 19, 5:00 AM PDT · 15750 days ago · 6 km deep · 87 km away
11. 2.34 km ENE of La Honda, CaliforniaFri, Aug 19, 11:57 AM PDT · 15749 days ago · 0 km deep · 96 km away
12. 1.81 km WNW of Greenfield, CaliforniaFri, Aug 19, 12:11 PM PDT · 15749 days ago · 23 km deep · 59 km away
13. 1.512 km S of Tres Pinos, CaliforniaFri, Aug 19, 1:19 PM PDT · 15749 days ago · 2 km deep · 20 km away
14. 1.85 km SSW of Tres Pinos, CaliforniaFri, Aug 19, 11:31 PM PDT · 15749 days ago · 6 km deep · 12 km away
15. 3.12 km ESE of Aromas, CaliforniaSun, Aug 21, 7:21 AM PDT · 15748 days ago · 7 km deep · 25 km away
16. 2.12 km E of Aromas, CaliforniaSun, Aug 21, 7:28 AM PDT · 15748 days ago · 6 km deep · 26 km away
17. 1.82 km E of Aromas, CaliforniaSun, Aug 21, 10:45 AM PDT · 15747 days ago · 7 km deep · 25 km away
18. 1.82 km ESE of Aromas, CaliforniaSun, Aug 21, 10:46 AM PDT · 15747 days ago · 7 km deep · 25 km away
19. 3.24 km S of San Juan Bautista, CaliforniaSun, Aug 21, 9:17 PM PDT · 15747 days ago · 7 km deep · 18 km away
20. 1.612 km ESE of East Foothills, CaliforniaMon, Aug 22, 5:47 AM PDT · 15747 days ago · 4 km deep · 61 km away
21. 2.92 km ESE of Aromas, CaliforniaMon, Aug 22, 6:29 AM PDT · 15747 days ago · 6 km deep · 25 km away
22. 1.625 km WSW of Volta, CaliforniaTue, Aug 23, 7:40 AM PDT · 15746 days ago · 4 km deep · 24 km away
23. 2.33 km SSE of San Juan Bautista, CaliforniaTue, Aug 23, 10:21 AM PDT · 15745 days ago · 4 km deep · 18 km away
24. 2.415 km SSE of Tres Pinos, CaliforniaTue, Aug 23, 12:52 PM PDT · 15745 days ago · 3 km deep · 23 km away
25. 2.225 km ENE of Greenfield, CaliforniaTue, Aug 23, 1:59 PM PDT · 15745 days ago · 5 km deep · 56 km away
26. 1.67 km E of East Foothills, CAWed, Aug 24, 12:49 PM PDT · 15744 days ago · 7 km deep · 69 km away
27. 1.625 km NE of Soledad, CaliforniaWed, Aug 24, 2:53 PM PDT · 15744 days ago · 2 km deep · 34 km away
28. 1.730 km ENE of Soledad, CaliforniaWed, Aug 24, 11:45 PM PDT · 15744 days ago · 7 km deep · 42 km away
29. 2.024 km NNE of San Lucas, CaliforniaThu, Aug 25, 3:01 AM PDT · 15744 days ago · 3 km deep · 72 km away
30. 2.323 km NE of King City, CaliforniaThu, Aug 25, 6:56 AM PDT · 15744 days ago · 5 km deep · 62 km away
31. 1.925 km NE of Greenfield, CaliforniaThu, Aug 25, 10:07 AM PDT · 15743 days ago · 1 km deep · 54 km away
32. 2.919 km NNW of Coalinga, CaliforniaThu, Aug 25, 7:48 PM PDT · 15743 days ago · 11 km deep · 99 km away
33. 1.615 km ESE of Tres Pinos, CaliforniaThu, Aug 25, 8:20 PM PDT · 15743 days ago · 9 km deep · 21 km away
34. 4.020 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:21 PM PDT · 15743 days ago · 11 km deep · 99 km away
35. 3.020 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:23 PM PDT · 15743 days ago · 11 km deep · 98 km away
36. 1.519 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:25 PM PDT · 15743 days ago · 11 km deep · 100 km away
37. 1.920 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:26 PM PDT · 15743 days ago · 9 km deep · 98 km away
38. 1.919 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:27 PM PDT · 15743 days ago · 9 km deep · 99 km away
39. 1.719 km NNW of Coalinga, CaliforniaThu, Aug 25, 8:30 PM PDT · 15743 days ago · 11 km deep · 99 km away
40. 2.320 km NW of Coalinga, CaliforniaThu, Aug 25, 8:41 PM PDT · 15743 days ago · 9 km deep · 99 km away
41. 2.118 km ESE of Livermore, CaliforniaThu, Aug 25, 9:38 PM PDT · 15743 days ago · 4 km deep · 85 km away
42. 2.619 km NNW of Coalinga, CaliforniaThu, Aug 25, 9:42 PM PDT · 15743 days ago · 10 km deep · 100 km away
43. 2.219 km NNW of Coalinga, CaliforniaThu, Aug 25, 10:13 PM PDT · 15743 days ago · 10 km deep · 100 km away
44. 1.921 km NW of Coalinga, CaliforniaThu, Aug 25, 11:26 PM PDT · 15743 days ago · 7 km deep · 97 km away
45. 2.020 km NNW of Coalinga, CaliforniaThu, Aug 25, 11:55 PM PDT · 15743 days ago · 10 km deep · 98 km away
46. 1.920 km NNW of Coalinga, CaliforniaFri, Aug 26, 12:09 AM PDT · 15743 days ago · 11 km deep · 98 km away
47. 2.229 km ENE of Soledad, CaliforniaFri, Aug 26, 1:53 PM PDT · 15742 days ago · 5 km deep · 43 km away
48. 2.15 km SSW of Ridgemark, CaliforniaFri, Aug 26, 4:37 PM PDT · 15742 days ago · 9 km deep · 11 km away
49. 2.924 km NE of Greenfield, CaliforniaFri, Aug 26, 4:45 PM PDT · 15742 days ago · 1 km deep · 50 km away
50. 2.63 km SSE of San Juan Bautista, CaliforniaSat, Aug 27, 7:41 AM PDT · 15742 days ago · 4 km deep · 18 km away
51. 1.911 km S of Tres Pinos, CaliforniaSun, Aug 28, 8:39 AM PDT · 15741 days ago · 3 km deep · 19 km away
52. 2.119 km SSE of Tres Pinos, CaliforniaSun, Aug 28, 4:54 PM PDT · 15740 days ago · 5 km deep · 27 km away
53. 1.517 km SW of King City, CaliforniaMon, Aug 29, 3:18 AM PDT · 15740 days ago · 1 km deep · 83 km away
54. 2.519 km NNW of Coalinga, CaliforniaMon, Aug 29, 7:44 PM PDT · 15739 days ago · 9 km deep · 99 km away
55. 2.523 km WNW of Three Rocks, CaliforniaTue, Aug 30, 12:20 PM PDT · 15738 days ago · 10 km deep · 70 km away
56. 1.914 km WSW of Three Rocks, CaliforniaTue, Aug 30, 10:28 PM PDT · 15738 days ago · 19 km deep · 83 km away
57. 2.224 km ENE of Greenfield, CaliforniaWed, Aug 31, 6:32 AM PDT · 15738 days ago · 5 km deep · 55 km away
58. 1.69 km ENE of Milpitas, CaliforniaWed, Aug 31, 9:11 AM PDT · 15738 days ago · 7 km deep · 80 km away
59. 1.64 km S of San Juan Bautista, CaliforniaWed, Aug 31, 1:13 PM PDT · 15737 days ago · 6 km deep · 19 km away
60. 2.316 km SSE of Tres Pinos, CaliforniaFri, Sep 2, 5:09 AM PDT · 15736 days ago · 5 km deep · 24 km away

The first 60 of 160.

Before

1. 3.25 km NNE of Ridgemark, CaliforniaThu, Aug 18, 1:54 AM PDT · 15751 days ago · 6 km deep · 0 km away
2. 2.637 km SSW of South Dos Palos, CaliforniaWed, Aug 17, 7:49 PM PDT · 15751 days ago · 6 km deep · 46 km away
3. 1.630 km ENE of Soledad, CaliforniaWed, Aug 17, 4:17 PM PDT · 15751 days ago · 8 km deep · 41 km away
4. 1.621 km NE of Soledad, CaliforniaTue, Aug 16, 10:16 PM PDT · 15752 days ago · 8 km deep · 39 km away
5. 1.612 km ESE of Gilroy, CaliforniaTue, Aug 16, 9:21 AM PDT · 15753 days ago · 7 km deep · 15 km away
6. 1.69 km ENE of San Martin, CaliforniaMon, Aug 15, 10:45 PM PDT · 15753 days ago · 9 km deep · 35 km away
7. 2.17 km E of East Foothills, CaliforniaMon, Aug 15, 7:29 PM PDT · 15753 days ago · 9 km deep · 68 km away
8. 2.321 km NE of Soledad, CaliforniaMon, Aug 15, 12:57 AM PDT · 15754 days ago · 4 km deep · 34 km away
9. 2.35 km NNE of Ridgemark, CaliforniaSun, Aug 14, 11:15 PM PDT · 15754 days ago · 6 km deep · 0 km away
10. 1.721 km NE of Soledad, CaliforniaSun, Aug 14, 9:23 PM PDT · 15754 days ago · 8 km deep · 39 km away
11. 1.622 km NE of Soledad, CaliforniaSat, Aug 13, 2:45 AM PDT · 15756 days ago · 9 km deep · 36 km away
12. 2.023 km ENE of Soledad, CaliforniaFri, Aug 12, 11:48 PM PDT · 15756 days ago · 2 km deep · 43 km away
13. 1.515 km SE of Livermore, CaliforniaFri, Aug 12, 7:12 PM PDT · 15756 days ago · 4 km deep · 84 km away
14. 2.238 km SSW of South Dos Palos, CaliforniaFri, Aug 12, 6:36 AM PDT · 15757 days ago · 6 km deep · 48 km away
15. 1.925 km NE of Soledad, CaliforniaThu, Aug 11, 8:49 PM PDT · 15757 days ago · 8 km deep · 38 km away
16. 1.830 km ENE of Soledad, CaliforniaThu, Aug 11, 6:00 PM PDT · 15757 days ago · 7 km deep · 42 km away
17. 2.231 km ENE of Soledad, CaliforniaThu, Aug 11, 12:56 AM PDT · 15758 days ago · 8 km deep · 41 km away
18. 1.621 km ESE of Big Sur, CaliforniaWed, Aug 10, 7:28 PM PDT · 15758 days ago · 10 km deep · 76 km away
19. 1.6Central CaliforniaWed, Aug 10, 11:29 AM PDT · 15758 days ago · 3 km deep · 27 km away
20. 2.936 km SSW of South Dos Palos, CaliforniaWed, Aug 10, 10:24 AM PDT · 15758 days ago · 7 km deep · 47 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1100621. Read Fri, Oct 2, 2026, 4:36 AM UTC.