M1.6 earthquake 10 km SW of Ridgemark, California

Magnitude

1.6 (md), micro

Local time

Sun, Aug 9, 1987, 6:50 PM PDT

UTC

1987-08-10 01:50:05 UTC

Depth

6.9 km (4.3 mi), shallow

Epicenter

36.749° N, 121.445° 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

±0.27

Depth from

From location

Station coverage gap

30°

Stations used

42

• Ridgemark, CaliforniaPopulation 3,016. Forecast10 kmSW
• Hollister, CaliforniaPopulation 37,462. Forecast12 kmSSW
• Salinas, CaliforniaPopulation 157,380. Forecast20 kmENE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast417 kmNW

After

1. 1.726 km SW of Firebaugh, CaliforniaSun, Aug 9, 9:04 PM PDT · 14297 days ago · 10 km deep · 66 km away
2. 1.76 km ESE of San Lucas, CaliforniaMon, Aug 10, 11:38 AM PDT · 14296 days ago · 9 km deep · 83 km away
3. 1.93 km S of San Juan Bautista, CaliforniaMon, Aug 10, 11:53 AM PDT · 14296 days ago · 6 km deep · 11 km away
4. 2.027 km WSW of Lockwood, CaliforniaMon, Aug 10, 12:27 PM PDT · 14296 days ago · 10 km deep · 95 km away
5. 1.717 km NE of East Foothills, CaliforniaMon, Aug 10, 11:10 PM PDT · 14296 days ago · 6 km deep · 87 km away
6. 1.610 km NNW of Hollister, CaliforniaMon, Aug 10, 11:30 PM PDT · 14296 days ago · 4 km deep · 21 km away
7. 2.11 km SSE of Tres Pinos, CaliforniaTue, Aug 11, 3:35 AM PDT · 14296 days ago · 8 km deep · 12 km away
8. 1.519 km SSE of Livermore, CaliforniaWed, Aug 12, 12:12 AM PDT · 14295 days ago · 5 km deep · 89 km away
9. 2.60 km WNW of Sand City, CaliforniaThu, Aug 13, 8:14 AM PDT · 14293 days ago · 2 km deep · 39 km away
10. 1.821 km NE of Soledad, CaliforniaThu, Aug 13, 7:39 PM PDT · 14293 days ago · 6 km deep · 35 km away
11. 2.612 km ESE of East Foothills, CaliforniaFri, Aug 14, 5:54 AM PDT · 14292 days ago · 7 km deep · 68 km away
12. 2.68 km NE of Interlaken, CaliforniaFri, Aug 14, 1:41 PM PDT · 14292 days ago · 7 km deep · 34 km away
13. 1.95 km SE of Tres Pinos, CaliforniaSat, Aug 15, 7:39 PM PDT · 14291 days ago · 8 km deep · 16 km away
14. 2.125 km NE of Greenfield, CaliforniaSun, Aug 16, 2:59 AM PDT · 14291 days ago · 9 km deep · 51 km away
15. 2.221 km NE of Soledad, CaliforniaSun, Aug 16, 4:40 PM PDT · 14290 days ago · 5 km deep · 31 km away
16. 2.021 km NE of Soledad, CaliforniaSun, Aug 16, 4:41 PM PDT · 14290 days ago · 5 km deep · 31 km away
17. 1.917 km WSW of Soledad, CaliforniaSun, Aug 16, 8:59 PM PDT · 14290 days ago · 9 km deep · 46 km away
18. 2.923 km NE of Soledad, CaliforniaMon, Aug 17, 7:28 AM PDT · 14289 days ago · 5 km deep · 34 km away
19. 2.122 km NE of San Lucas, CaliforniaMon, Aug 17, 6:42 PM PDT · 14289 days ago · 9 km deep · 77 km away
20. 1.824 km NE of Greenfield, CaliforniaTue, Aug 18, 1:37 PM PDT · 14288 days ago · 1 km deep · 47 km away
21. 1.623 km NE of Soledad, CaliforniaTue, Aug 18, 3:49 PM PDT · 14288 days ago · 4 km deep · 35 km away
22. 2.118 km NE of East Foothills, CaliforniaThu, Aug 20, 4:54 PM PDT · 14286 days ago · 6 km deep · 87 km away
23. 2.021 km NE of Soledad, CaliforniaThu, Aug 20, 8:09 PM PDT · 14286 days ago · 2 km deep · 34 km away
24. 1.53 km WSW of Hollister, CaliforniaFri, Aug 21, 6:38 AM PDT · 14285 days ago · 9 km deep · 11 km away
25. 1.915 km N of Morgan Hill, CaliforniaFri, Aug 21, 10:06 AM PDT · 14285 days ago · 4 km deep · 61 km away
26. 1.917 km NE of East Foothills, CaliforniaSat, Aug 22, 8:19 AM PDT · 14284 days ago · 6 km deep · 87 km away
27. 1.65 km ENE of Hollister, CaliforniaSat, Aug 22, 5:25 PM PDT · 14284 days ago · 5 km deep · 17 km away
28. 1.64 km E of Sunol, CaliforniaSat, Aug 22, 10:48 PM PDT · 14284 days ago · 7 km deep · 99 km away
29. 1.824 km NE of Greenfield, CaliforniaSat, Aug 22, 11:47 PM PDT · 14284 days ago · 6 km deep · 46 km away
30. 2.022 km NNE of Soledad, CaliforniaSun, Aug 23, 7:20 AM PDT · 14283 days ago · 8 km deep · 26 km away
31. 2.817 km SSE of Livermore, CaliforniaSun, Aug 23, 10:43 AM PDT · 14283 days ago · 1 km deep · 91 km away
32. 3.818 km SW of Gustine, CaliforniaWed, Aug 26, 2:49 AM PDT · 14281 days ago · 0 km deep · 52 km away
33. 2.023 km NE of San Lucas, CaliforniaWed, Aug 26, 2:56 AM PDT · 14281 days ago · 7 km deep · 76 km away
34. 1.62 km SW of Ridgemark, CaliforniaWed, Aug 26, 11:09 AM PDT · 14280 days ago · 8 km deep · 7 km away
35. 1.912 km S of Tres Pinos, CaliforniaWed, Aug 26, 2:50 PM PDT · 14280 days ago · 3 km deep · 16 km away
36. 1.518 km SW of Gustine, CaliforniaThu, Aug 27, 6:36 AM PDT · 14279 days ago · 0 km deep · 51 km away
37. 2.510 km ENE of East Foothills, CaliforniaFri, Aug 28, 11:05 AM PDT · 14278 days ago · 8 km deep · 78 km away
38. 3.26 km ENE of Big Sur, CaliforniaFri, Aug 28, 5:06 PM PDT · 14278 days ago · 13 km deep · 58 km away
39. 1.7Central CaliforniaSat, Aug 29, 2:45 AM PDT · 14278 days ago · 11 km deep · 99 km away
40. 2.04 km S of San Juan Bautista, CaliforniaSat, Aug 29, 5:44 AM PDT · 14277 days ago · 7 km deep · 10 km away
41. 2.9Central CaliforniaSat, Aug 29, 5:45 AM PDT · 14277 days ago · 6 km deep · 80 km away
42. 1.94 km S of San Juan Bautista, CaliforniaSat, Aug 29, 8:17 AM PDT · 14277 days ago · 7 km deep · 10 km away
43. 2.311 km SSW of Three Rocks, CaliforniaSat, Aug 29, 7:07 PM PDT · 14277 days ago · 10 km deep · 99 km away
44. 1.512 km ENE of East Foothills, CaliforniaSun, Aug 30, 12:09 AM PDT · 14277 days ago · 8 km deep · 79 km away
45. 1.513 km N of Morgan Hill, CaliforniaSun, Aug 30, 4:07 AM PDT · 14277 days ago · 5 km deep · 58 km away
46. 1.513 km ESE of Alum Rock, CaliforniaMon, Aug 31, 2:44 AM PDT · 14276 days ago · 2 km deep · 67 km away
47. 2.117 km NE of East Foothills, CaliforniaMon, Aug 31, 10:09 AM PDT · 14275 days ago · 7 km deep · 87 km away
48. 2.032 km WNW of Three Rocks, CaliforniaMon, Aug 31, 3:56 PM PDT · 14275 days ago · 7 km deep · 66 km away
49. 1.81 km NW of Three Rocks, CaliforniaTue, Sep 1, 1:26 PM PDT · 14274 days ago · 5 km deep · 97 km away
50. 1.67 km NE of Hollister, CaliforniaTue, Sep 1, 1:31 PM PDT · 14274 days ago · 6 km deep · 20 km away
51. 2.218 km SSE of Tres Pinos, CaliforniaWed, Sep 2, 12:25 AM PDT · 14274 days ago · 6 km deep · 22 km away
52. 1.823 km NNE of San Lucas, CaliforniaWed, Sep 2, 1:03 AM PDT · 14274 days ago · 6 km deep · 69 km away
53. 2.618 km NE of East Foothills, CaliforniaWed, Sep 2, 12:13 PM PDT · 14273 days ago · 5 km deep · 86 km away
54. 1.815 km E of Seven Trees, CaliforniaFri, Sep 4, 3:31 AM PDT · 14272 days ago · 3 km deep · 63 km away
55. 2.78 km ESE of East Foothills, CaliforniaFri, Sep 4, 11:10 AM PDT · 14271 days ago · 8 km deep · 72 km away
56. 1.517 km NE of East Foothills, CaliforniaFri, Sep 4, 11:16 AM PDT · 14271 days ago · 7 km deep · 87 km away
57. 2.017 km SSE of Tres Pinos, CaliforniaFri, Sep 4, 6:38 PM PDT · 14271 days ago · 4 km deep · 21 km away
58. 1.63 km SSW of Hollister, CaliforniaMon, Sep 7, 9:55 AM PDT · 14268 days ago · 6 km deep · 9 km away
59. 2.51 km ENE of Tres Pinos, CaliforniaTue, Sep 8, 3:44 PM PDT · 14267 days ago · 9 km deep · 13 km away
60. 1.823 km SE of Tres Pinos, CaliforniaWed, Sep 9, 12:04 AM PDT · 14267 days ago · 7 km deep · 29 km away

The first 60 of 114.

Before

1. 2.319 km S of Big Sur, CaliforniaSun, Aug 9, 6:34 PM PDT · 14297 days ago · 16 km deep · 80 km away
2. 1.918 km SSE of Livermore, CaliforniaSun, Aug 9, 1:58 AM PDT · 14298 days ago · 7 km deep · 89 km away
3. 1.741 km W of Three Rocks, CaliforniaSat, Aug 8, 9:42 AM PDT · 14298 days ago · 5 km deep · 57 km away
4. 2.224 km NE of San Ardo, CaliforniaSat, Aug 8, 2:30 AM PDT · 14299 days ago · 8 km deep · 87 km away
5. 1.84 km SSE of Portola Valley, CaliforniaFri, Aug 7, 12:46 PM PDT · 14299 days ago · 10 km deep · 95 km away
6. 2.24 km SSE of Portola Valley, CaliforniaFri, Aug 7, 1:48 AM PDT · 14300 days ago · 10 km deep · 95 km away
7. 1.75 km NNE of Tres Pinos, CaliforniaWed, Aug 5, 9:39 PM PDT · 14301 days ago · 4 km deep · 16 km away
8. 2.68 km NE of San Martin, CaliforniaWed, Aug 5, 6:44 AM PDT · 14301 days ago · 8 km deep · 43 km away
9. 1.77 km SE of Lexington Hills, CaliforniaTue, Aug 4, 7:40 PM PDT · 14302 days ago · 14 km deep · 58 km away
10. 1.921 km NE of Soledad, CaliforniaTue, Aug 4, 1:21 PM PDT · 14302 days ago · 6 km deep · 34 km away
11. 1.616 km E of Seven Trees, CaliforniaTue, Aug 4, 2:54 AM PDT · 14303 days ago · 6 km deep · 62 km away
12. 1.724 km NE of Greenfield, CaliforniaTue, Aug 4, 12:42 AM PDT · 14303 days ago · 7 km deep · 46 km away
13. 1.615 km ESE of East Foothills, CaliforniaSat, Aug 1, 8:45 PM PDT · 14305 days ago · 2 km deep · 68 km away
14. 1.526 km S of Big Sur, CaliforniaSat, Aug 1, 10:29 AM PDT · 14305 days ago · 12 km deep · 85 km away
15. 2.015 km E of Seven Trees, CaliforniaFri, Jul 31, 6:40 PM PDT · 14306 days ago · 6 km deep · 63 km away
16. 1.5Northern CaliforniaFri, Jul 31, 8:21 AM PDT · 14306 days ago · 6 km deep · 62 km away
17. 1.714 km SSE of Big Sur, CaliforniaFri, Jul 31, 8:06 AM PDT · 14306 days ago · 5 km deep · 70 km away
18. 1.812 km S of Tres Pinos, CaliforniaFri, Jul 31, 2:25 AM PDT · 14307 days ago · 6 km deep · 15 km away
19. 1.89 km SE of San Juan Bautista, CaliforniaThu, Jul 30, 5:12 AM PDT · 14308 days ago · 7 km deep · 4 km away
20. 1.87 km NNE of East Foothills, CaliforniaWed, Jul 29, 5:42 PM PDT · 14308 days ago · 7 km deep · 84 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc104293. Read Wed, Sep 30, 2026, 11:42 PM UTC.