M1.9 earthquake 2 km SSW of Blackhawk, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Mon, Feb 17, 1986, 12:55 AM PST

UTC

1986-02-17 08:55:56 UTC

Depth

12.6 km (7.8 mi), shallow

Epicenter

37.802° N, 121.916° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.13

Depth from

From location

Station coverage gap

113°

Stations used

19

• Blackhawk, CaliforniaPopulation 9,354. Forecast2 kmSSW
• San Ramon, CaliforniaPopulation 76,134. Forecast6 kmENE
• Hayward, CaliforniaPopulation 158,289. Forecast21 kmNE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast532 kmNW

After

1. 1.66 km SSW of Sunol, CaliforniaMon, Feb 17, 12:42 PM PST · 14838 days ago · 5 km deep · 29 km away
2. 1.613 km E of Seven Trees, CaliforniaMon, Feb 17, 7:03 PM PST · 14837 days ago · 5 km deep · 58 km away
3. 2.012 km N of Livermore, CaliforniaMon, Feb 17, 9:47 PM PST · 14837 days ago · 11 km deep · 14 km away
4. 2.23 km ESE of Berkeley, CaliforniaMon, Feb 17, 9:48 PM PST · 14837 days ago · 7 km deep · 29 km away
5. 1.716 km N of Morgan Hill, CaliforniaTue, Feb 18, 4:29 AM PST · 14837 days ago · 6 km deep · 63 km away
6. 2.31 km SSW of Blackhawk, CaliforniaWed, Feb 19, 3:02 PM PST · 14836 days ago · 13 km deep · 0 km away
7. 1.913 km N of Morgan Hill, CaliforniaWed, Feb 19, 9:23 PM PST · 14835 days ago · 5 km deep · 66 km away
8. 1.62 km SSW of Blackhawk, CaliforniaWed, Feb 19, 9:53 PM PST · 14835 days ago · 13 km deep · 0 km away
9. 2.25 km W of Diablo Grande, CaliforniaThu, Feb 20, 12:57 AM PST · 14835 days ago · -1 km deep · 67 km away
10. 2.011 km NE of Morgan Hill, CaliforniaThu, Feb 20, 12:23 PM PST · 14835 days ago · 5 km deep · 72 km away
11. 1.73 km E of Berkeley, CaliforniaThu, Feb 20, 6:39 PM PST · 14834 days ago · 10 km deep · 29 km away
12. 1.715 km N of Morgan Hill, CaliforniaFri, Feb 21, 12:45 AM PST · 14834 days ago · 6 km deep · 63 km away
13. 2.18 km NE of East Foothills, CaliforniaSat, Feb 22, 7:39 PM PST · 14832 days ago · 6 km deep · 44 km away
14. 2.18 km ENE of Morgan Hill, CaliforniaSun, Feb 23, 6:59 PM PST · 14831 days ago · 4 km deep · 76 km away
15. 1.714 km E of Seven Trees, CaliforniaMon, Feb 24, 2:07 AM PST · 14831 days ago · 2 km deep · 60 km away
16. 1.612 km ESE of East Foothills, CaliforniaMon, Feb 24, 2:34 AM PST · 14831 days ago · 7 km deep · 56 km away
17. 1.614 km E of Seven Trees, CaliforniaMon, Feb 24, 2:38 AM PST · 14831 days ago · 1 km deep · 60 km away
18. 1.78 km NNE of Bay Point, CaliforniaMon, Feb 24, 12:33 PM PST · 14831 days ago · 5 km deep · 33 km away
19. 2.114 km E of Seven Trees, CaliforniaTue, Feb 25, 3:03 AM PST · 14830 days ago · 1 km deep · 61 km away
20. 1.85 km S of Moskowite Corner, CaliforniaTue, Feb 25, 5:40 PM PST · 14829 days ago · 2 km deep · 71 km away
21. 1.715 km SSE of Pescadero, CaliforniaWed, Feb 26, 6:09 PM PST · 14828 days ago · 5 km deep · 84 km away
22. 1.82 km WSW of Corralitos, CaliforniaThu, Feb 27, 8:43 AM PST · 14828 days ago · 13 km deep · 91 km away
23. 1.52 km WSW of Corralitos, CaliforniaThu, Feb 27, 9:04 AM PST · 14828 days ago · 13 km deep · 91 km away
24. 1.72 km WSW of Corralitos, CaliforniaFri, Feb 28, 10:06 AM PST · 14827 days ago · 13 km deep · 91 km away
25. 1.76 km SW of Gilroy, CaliforniaFri, Feb 28, 6:24 PM PST · 14826 days ago · 5 km deep · 96 km away
26. 2.06 km NE of San Martin, CaliforniaFri, Feb 28, 10:36 PM PST · 14826 days ago · 3 km deep · 82 km away
27. 2.58 km SE of La Honda, CaliforniaSat, Mar 1, 2:14 AM PST · 14826 days ago · 7 km deep · 65 km away
28. 2.36 km ENE of Rohnert Park, CaliforniaSun, Mar 2, 7:29 AM PST · 14825 days ago · 6 km deep · 87 km away
29. 1.81 km SSE of East Richmond Heights, CaliforniaSun, Mar 2, 9:18 PM PST · 14824 days ago · 3 km deep · 37 km away
30. 1.58 km ENE of Morgan Hill, CaliforniaTue, Mar 4, 4:53 AM PST · 14823 days ago · 4 km deep · 77 km away
31. 1.73 km S of Fairview, CaliforniaWed, Mar 5, 3:09 PM PST · 14822 days ago · 3 km deep · 21 km away
32. 1.51 km NNE of Kensington, CaliforniaThu, Mar 6, 10:02 AM PST · 14821 days ago · 5 km deep · 34 km away
33. 1.714 km E of Seven Trees, CaliforniaFri, Mar 7, 12:48 AM PST · 14820 days ago · 1 km deep · 60 km away
34. 2.17 km ENE of Gilroy, CaliforniaFri, Mar 7, 2:02 PM PST · 14820 days ago · 6 km deep · 94 km away
35. 2.18 km ENE of San Martin, CaliforniaSat, Mar 8, 1:05 AM PST · 14819 days ago · 6 km deep · 84 km away
36. 1.614 km E of Seven Trees, CaliforniaSat, Mar 8, 1:56 AM PST · 14819 days ago · 1 km deep · 61 km away
37. 1.714 km E of Seven Trees, CaliforniaSat, Mar 8, 2:32 AM PST · 14819 days ago · 3 km deep · 61 km away
38. 3.02 km SW of Broadmoor, CaliforniaSat, Mar 8, 5:28 PM PST · 14818 days ago · 5 km deep · 54 km away
39. 2.52 km SW of Broadmoor, CaliforniaSat, Mar 8, 6:47 PM PST · 14818 days ago · 5 km deep · 54 km away
40. 1.68 km ENE of Gilroy, CaliforniaSun, Mar 9, 2:20 PM PST · 14818 days ago · 6 km deep · 94 km away
41. 1.715 km N of Morgan Hill, CaliforniaSun, Mar 9, 7:18 PM PST · 14817 days ago · 6 km deep · 63 km away
42. 1.96 km WSW of Gilroy, CaliforniaTue, Mar 11, 12:37 PM PST · 14816 days ago · 6 km deep · 94 km away
43. 1.73 km N of East Foothills, CaliforniaTue, Mar 11, 5:02 PM PST · 14815 days ago · 0 km deep · 44 km away
44. 1.69 km E of San Martin, CaliforniaThu, Mar 13, 3:41 AM PST · 14814 days ago · 8 km deep · 88 km away
45. 2.015 km N of Morgan Hill, CaliforniaSat, Mar 15, 10:47 AM PST · 14812 days ago · 2 km deep · 64 km away
46. 2.35 km E of Fremont, CaliforniaSun, Mar 16, 8:25 PM PST · 14810 days ago · 9 km deep · 29 km away
47. 1.79 km ENE of Morgan Hill, CaliforniaMon, Mar 17, 12:22 AM PST · 14810 days ago · 5 km deep · 78 km away
48. 1.613 km N of Morgan Hill, CaliforniaWed, Mar 19, 10:34 AM PST · 14808 days ago · 3 km deep · 66 km away
49. 1.52 km SSE of Roseland, CaliforniaWed, Mar 19, 4:43 PM PST · 14808 days ago · 4 km deep · 97 km away
50. 1.515 km NE of East Foothills, CaliforniaThu, Mar 20, 7:42 AM PST · 14807 days ago · 8 km deep · 42 km away
51. 2.014 km E of Seven Trees, CaliforniaThu, Mar 20, 12:07 PM PST · 14807 days ago · 2 km deep · 60 km away
52. 2.113 km ESE of East Foothills, CaliforniaThu, Mar 20, 7:49 PM PST · 14806 days ago · 8 km deep · 57 km away
53. 2.19 km E of Elmira, CaliforniaSun, Mar 23, 2:12 PM PST · 14804 days ago · 17 km deep · 60 km away
54. 2.915 km NE of East Foothills, CaliforniaSun, Mar 23, 5:54 PM PST · 14803 days ago · 9 km deep · 41 km away
55. 2.616 km NE of East Foothills, CaliforniaSun, Mar 23, 6:26 PM PST · 14803 days ago · 8 km deep · 41 km away
56. 1.616 km NE of East Foothills, CaliforniaSun, Mar 23, 9:06 PM PST · 14803 days ago · 8 km deep · 41 km away
57. 1.9Northern CaliforniaSun, Mar 23, 10:29 PM PST · 14803 days ago · 8 km deep · 41 km away
58. 1.82 km ENE of Diablo, CaliforniaTue, Mar 25, 7:45 PM PST · 14801 days ago · 8 km deep · 4 km away
59. 2.11 km NW of Concord, CaliforniaWed, Mar 26, 7:53 AM PST · 14801 days ago · 15 km deep · 23 km away
60. 3.214 km N of Morgan Hill, CaliforniaThu, Mar 27, 1:25 PM PST · 14800 days ago · 6 km deep · 65 km away

The first 60 of 182.

Before

1. 2.67 km S of Sunol, CaliforniaSun, Feb 16, 6:43 PM PST · 14838 days ago · 7 km deep · 30 km away
2. 3.31 km SSW of Blackhawk, CaliforniaSun, Feb 16, 4:39 PM PST · 14839 days ago · 15 km deep · 0 km away
3. 2.87 km S of Sunol, CaliforniaSat, Feb 15, 9:47 AM PST · 14840 days ago · 7 km deep · 31 km away
4. 2.88 km ENE of San Martin, CaliforniaSat, Feb 15, 1:53 AM PST · 14840 days ago · 7 km deep · 84 km away
5. 1.618 km ESE of East Foothills, CaliforniaFri, Feb 14, 7:35 AM PST · 14841 days ago · 2 km deep · 59 km away
6. 1.611 km SE of La Honda, CaliforniaWed, Feb 12, 8:43 PM PST · 14842 days ago · 8 km deep · 65 km away
7. 1.812 km SE of La Honda, CaliforniaWed, Feb 12, 8:05 PM PST · 14842 days ago · 9 km deep · 65 km away
8. 1.99 km ESE of East Foothills, CaliforniaTue, Feb 11, 10:16 PM PST · 14843 days ago · 5 km deep · 53 km away
9. 1.615 km E of Seven Trees, CaliforniaTue, Feb 11, 3:50 AM PST · 14844 days ago · 3 km deep · 61 km away
10. 2.116 km NE of East Foothills, CaliforniaTue, Feb 11, 12:39 AM PST · 14844 days ago · 6 km deep · 39 km away
11. 1.91 km SSW of Blackhawk, CaliforniaMon, Feb 10, 6:06 PM PST · 14844 days ago · 14 km deep · 1 km away
12. 1.8Northern CaliforniaMon, Feb 10, 8:24 AM PST · 14845 days ago · 12 km deep · 0 km away
13. 2.91 km SSW of Blackhawk, CaliforniaMon, Feb 10, 8:22 AM PST · 14845 days ago · 14 km deep · 0 km away
14. 1.66 km NE of East Foothills, CaliforniaMon, Feb 10, 8:14 AM PST · 14845 days ago · 8 km deep · 44 km away
15. 1.618 km NNE of Morgan Hill, CaliforniaMon, Feb 10, 1:27 AM PST · 14845 days ago · 6 km deep · 67 km away
16. 2.58 km NE of Gilroy, CaliforniaSat, Feb 8, 4:45 AM PST · 14847 days ago · 6 km deep · 92 km away
17. 2.55 km ENE of East Foothills, CaliforniaFri, Feb 7, 9:15 AM PST · 14848 days ago · 3 km deep · 47 km away
18. 1.55 km ESE of Pleasanton, CaliforniaTue, Feb 4, 4:47 AM PST · 14851 days ago · 4 km deep · 20 km away
19. 2.64 km SE of Pleasanton, CaliforniaMon, Feb 3, 6:26 PM PST · 14851 days ago · 5 km deep · 20 km away
20. 1.94 km SE of Pleasanton, CaliforniaSun, Feb 2, 10:22 PM PST · 14852 days ago · 5 km deep · 20 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc66566. Read Sat, Oct 3, 2026, 12:25 PM UTC.