M1.8 earthquake 6 km NNE of Ridgemark, California

Magnitude

1.8 (md), micro

Local time

Fri, Aug 18, 1978, 5:03 AM PDT

UTC

1978-08-18 12:03:10 UTC

Depth

5.9 km (3.6 mi), shallow

Epicenter

36.861° N, 121.329° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.5 km in depth

Magnitude uncertainty

±0.14

Depth from

From location

Station coverage gap

83°

Stations used

35

• Ridgemark, CaliforniaPopulation 3,016. Forecast6 kmNNE
• Hollister, CaliforniaPopulation 37,462. Forecast7 kmE
• Salinas, CaliforniaPopulation 157,380. Forecast35 kmNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast419 kmNW

After

1. 2.237 km SE of Big Sur, CaliforniaFri, Aug 18, 8:14 PM PDT · 17575 days ago · 10 km deep · 98 km away
2. 1.922 km NE of San Lucas, CaliforniaSat, Aug 19, 3:33 PM PDT · 17574 days ago · 6 km deep · 78 km away
3. 2.024 km E of Tres Pinos, CaliforniaSat, Aug 19, 8:40 PM PDT · 17574 days ago · 0 km deep · 27 km away
4. 2.124 km E of Tres Pinos, CaliforniaSat, Aug 19, 8:41 PM PDT · 17574 days ago · 1 km deep · 27 km away
5. 1.821 km NE of Soledad, CaliforniaMon, Aug 21, 11:20 AM PDT · 17572 days ago · 5 km deep · 35 km away
6. 1.68 km N of Morgan Hill, CaliforniaMon, Aug 21, 1:59 PM PDT · 17572 days ago · 4 km deep · 48 km away
7. 1.72 km SW of San Juan Bautista, CaliforniaTue, Aug 22, 2:44 AM PDT · 17572 days ago · 7 km deep · 21 km away
8. 1.723 km ENE of Soledad, CaliforniaTue, Aug 22, 9:46 AM PDT · 17571 days ago · 6 km deep · 47 km away
9. 2.31 km SW of Los Altos Hills, CaliforniaTue, Aug 22, 5:07 PM PDT · 17571 days ago · 4 km deep · 92 km away
10. 2.08 km WSW of Saratoga, CaliforniaWed, Aug 23, 6:16 AM PDT · 17570 days ago · 10 km deep · 80 km away
11. 3.126 km WNW of Diablo Grande, CaliforniaThu, Aug 24, 2:04 PM PDT · 17569 days ago · 5 km deep · 73 km away
12. 1.64 km SW of Tres Pinos, CaliforniaThu, Aug 24, 4:46 PM PDT · 17569 days ago · 6 km deep · 12 km away
13. 1.78 km NE of Gilroy, CaliforniaSun, Aug 27, 3:23 AM PDT · 17567 days ago · 8 km deep · 26 km away
14. 2.23 km NNW of Hollister, CaliforniaSun, Aug 27, 7:30 AM PDT · 17566 days ago · 7 km deep · 8 km away
15. 1.53 km W of Ridgemark, CaliforniaSun, Aug 27, 5:21 PM PDT · 17566 days ago · 7 km deep · 8 km away
16. 1.721 km NE of Soledad, CaliforniaSun, Aug 27, 5:24 PM PDT · 17566 days ago · 5 km deep · 40 km away
17. 2.32 km ESE of Tres Pinos, CaliforniaSun, Aug 27, 7:40 PM PDT · 17566 days ago · 9 km deep · 9 km away
18. 3.26 km SE of Sunol, CaliforniaSun, Aug 27, 8:32 PM PDT · 17566 days ago · 10 km deep · 89 km away
19. 1.92 km ESE of Aromas, CaliforniaSun, Aug 27, 10:33 PM PDT · 17566 days ago · 7 km deep · 26 km away
20. 3.021 km NE of Soledad, CaliforniaMon, Aug 28, 12:57 PM PDT · 17565 days ago · 7 km deep · 40 km away
21. 2.115 km SE of Livermore, CaliforniaMon, Aug 28, 1:42 PM PDT · 17565 days ago · 2 km deep · 84 km away
22. 2.39 km ESE of East Foothills, CaliforniaMon, Aug 28, 4:38 PM PDT · 17565 days ago · 7 km deep · 64 km away
23. 1.79 km ESE of East Foothills, CaliforniaMon, Aug 28, 4:47 PM PDT · 17565 days ago · 8 km deep · 64 km away
24. 4.19 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:14 PM PDT · 17565 days ago · 8 km deep · 65 km away
25. 2.010 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:16 PM PDT · 17565 days ago · 8 km deep · 64 km away
26. 1.89 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:18 PM PDT · 17565 days ago · 8 km deep · 65 km away
27. 3.810 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:18 PM PDT · 17565 days ago · 8 km deep · 63 km away
28. 1.59 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:22 PM PDT · 17565 days ago · 7 km deep · 64 km away
29. 2.210 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:23 PM PDT · 17565 days ago · 7 km deep · 64 km away
30. 2.69 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:27 PM PDT · 17565 days ago · 8 km deep · 65 km away
31. 2.59 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:27 PM PDT · 17565 days ago · 5 km deep · 65 km away
32. 1.510 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:40 PM PDT · 17565 days ago · 8 km deep · 63 km away
33. 2.110 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:42 PM PDT · 17565 days ago · 7 km deep · 63 km away
34. 1.810 km ESE of East Foothills, CaliforniaMon, Aug 28, 5:54 PM PDT · 17565 days ago · 7 km deep · 64 km away
35. 1.610 km ESE of East Foothills, CaliforniaMon, Aug 28, 7:02 PM PDT · 17565 days ago · 7 km deep · 64 km away
36. 2.010 km ESE of East Foothills, CaliforniaTue, Aug 29, 5:43 AM PDT · 17564 days ago · 8 km deep · 63 km away
37. 2.410 km ESE of East Foothills, CaliforniaTue, Aug 29, 6:47 AM PDT · 17564 days ago · 8 km deep · 64 km away
38. 1.510 km ESE of East Foothills, CaliforniaTue, Aug 29, 3:42 PM PDT · 17564 days ago · 8 km deep · 64 km away
39. 2.616 km SSE of Tres Pinos, CaliforniaTue, Aug 29, 5:24 PM PDT · 17564 days ago · 6 km deep · 24 km away
40. 1.816 km SSE of Tres Pinos, CaliforniaTue, Aug 29, 5:31 PM PDT · 17564 days ago · 6 km deep · 24 km away
41. 2.016 km SSE of Tres Pinos, CaliforniaTue, Aug 29, 5:32 PM PDT · 17564 days ago · 6 km deep · 24 km away
42. 2.216 km SSE of Tres Pinos, CaliforniaTue, Aug 29, 5:53 PM PDT · 17564 days ago · 6 km deep · 24 km away
43. 2.415 km SSE of Tres Pinos, CaliforniaTue, Aug 29, 6:54 PM PDT · 17564 days ago · 6 km deep · 24 km away
44. 2.0Central CaliforniaWed, Aug 30, 10:28 AM PDT · 17563 days ago · 2 km deep · 31 km away
45. 1.716 km NE of East Foothills, CaliforniaWed, Aug 30, 2:59 PM PDT · 17563 days ago · 6 km deep · 77 km away
46. 1.710 km ESE of East Foothills, CaliforniaWed, Aug 30, 11:44 PM PDT · 17563 days ago · 7 km deep · 63 km away
47. 2.46 km ENE of Seven Trees, CaliforniaThu, Aug 31, 1:25 PM PDT · 17562 days ago · 5 km deep · 64 km away
48. 2.46 km ENE of Seven Trees, CaliforniaFri, Sep 1, 2:30 AM PDT · 17562 days ago · 6 km deep · 64 km away
49. 3.36 km ENE of Seven Trees, CaliforniaFri, Sep 1, 2:31 AM PDT · 17562 days ago · 5 km deep · 64 km away
50. 1.713 km E of Seven Trees, CaliforniaSat, Sep 2, 1:34 PM PDT · 17560 days ago · 1 km deep · 58 km away
51. 1.87 km NE of Interlaken, CaliforniaSat, Sep 2, 3:03 PM PDT · 17560 days ago · 4 km deep · 34 km away
52. 1.915 km SW of Los Banos, CaliforniaSat, Sep 2, 8:14 PM PDT · 17560 days ago · 6 km deep · 33 km away
53. 2.323 km NE of Greenfield, CaliforniaSun, Sep 3, 11:01 AM PDT · 17559 days ago · 9 km deep · 51 km away
54. 1.92 km ENE of Ridgemark, CaliforniaMon, Sep 4, 3:35 AM PDT · 17558 days ago · 6 km deep · 4 km away
55. 1.621 km NE of Soledad, CaliforniaMon, Sep 4, 7:33 PM PDT · 17558 days ago · 0 km deep · 33 km away
56. 2.522 km ENE of San Ardo, CaliforniaMon, Sep 4, 7:41 PM PDT · 17558 days ago · 6 km deep · 100 km away
57. 2.222 km ENE of San Lucas, CaliforniaMon, Sep 4, 7:45 PM PDT · 17558 days ago · 9 km deep · 83 km away
58. 1.79 km ESE of Gilroy, CaliforniaTue, Sep 5, 1:14 AM PDT · 17558 days ago · 4 km deep · 18 km away
59. 2.66 km ENE of Seven Trees, CaliforniaTue, Sep 5, 2:05 PM PDT · 17557 days ago · 5 km deep · 64 km away
60. 1.612 km SW of Soledad, CaliforniaWed, Sep 6, 12:21 AM PDT · 17557 days ago · 11 km deep · 58 km away

The first 60 of 176.

Before

1. 2.6Central CaliforniaThu, Aug 17, 7:21 AM PDT · 17576 days ago · 7 km deep · 21 km away
2. 2.330 km SSW of South Dos Palos, CaliforniaThu, Aug 17, 12:04 AM PDT · 17577 days ago · 6 km deep · 46 km away
3. 2.323 km NNE of San Lucas, CaliforniaWed, Aug 16, 10:43 PM PDT · 17577 days ago · 6 km deep · 74 km away
4. 2.3Central CaliforniaWed, Aug 16, 9:10 PM PDT · 17577 days ago · 2 km deep · 50 km away
5. 1.69 km NW of Hollister, CaliforniaWed, Aug 16, 8:28 PM PDT · 17577 days ago · 4 km deep · 14 km away
6. 1.67 km NNE of Corralitos, CaliforniaWed, Aug 16, 7:16 PM PDT · 17577 days ago · 13 km deep · 45 km away
7. 2.421 km NE of Soledad, CaliforniaWed, Aug 16, 11:07 AM PDT · 17577 days ago · 5 km deep · 35 km away
8. 1.624 km E of Tres Pinos, CaliforniaTue, Aug 15, 7:06 PM PDT · 17578 days ago · 0 km deep · 27 km away
9. 1.810 km SE of Sunol, CaliforniaMon, Aug 14, 8:14 PM PDT · 17579 days ago · 5 km deep · 85 km away
10. 1.523 km NNE of San Lucas, CaliforniaMon, Aug 14, 7:59 PM PDT · 17579 days ago · 4 km deep · 72 km away
11. 1.71 km WSW of Tres Pinos, CaliforniaMon, Aug 14, 2:21 PM PDT · 17579 days ago · 6 km deep · 9 km away
12. 1.929 km ENE of Soledad, CaliforniaMon, Aug 14, 3:30 AM PDT · 17579 days ago · 6 km deep · 41 km away
13. 3.211 km S of Tres Pinos, CaliforniaSat, Aug 12, 7:58 PM PDT · 17581 days ago · 3 km deep · 19 km away
14. 1.929 km ENE of Soledad, CaliforniaSat, Aug 12, 12:46 AM PDT · 17582 days ago · 6 km deep · 44 km away
15. 1.83 km NNW of Hollister, CaliforniaFri, Aug 11, 8:03 PM PDT · 17582 days ago · 7 km deep · 8 km away
16. 2.46 km NE of East Foothills, CaliforniaFri, Aug 11, 3:48 PM PDT · 17582 days ago · 8 km deep · 73 km away
17. 2.32 km NE of East Foothills, CaliforniaFri, Aug 11, 5:35 AM PDT · 17582 days ago · 0 km deep · 73 km away
18. 2.617 km SSE of Tres Pinos, CaliforniaThu, Aug 10, 9:29 PM PDT · 17583 days ago · 3 km deep · 25 km away
19. 2.510 km SW of Ridgemark, CaliforniaThu, Aug 10, 10:47 AM PDT · 17583 days ago · 6 km deep · 16 km away
20. 2.114 km SSE of Tres Pinos, CaliforniaWed, Aug 9, 2:31 PM PDT · 17584 days ago · 4 km deep · 22 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1041740. Read Wed, Sep 30, 2026, 9:54 PM UTC.