M1.7 earthquake 4 km NE of Blackhawk, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Fri, Apr 10, 1981, 3:03 PM PST

UTC

1981-04-10 23:03:34 UTC

Depth

5.3 km (3.3 mi), shallow

Epicenter

37.847° N, 121.865° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.16

Depth from

From location

Station coverage gap

94°

Stations used

17

• Blackhawk, CaliforniaPopulation 9,354. Forecast5 kmNE
• Clayton, CaliforniaPopulation 11,867. Forecast12 kmSSE
• Antioch, CaliforniaPopulation 110,542. Forecast18 kmSSW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast533 kmNW

After

1. 3.410 km NNE of Livermore, CaliforniaSat, Apr 11, 3:47 PM PST · 16609 days ago · 13 km deep · 15 km away
2. 1.814 km E of Seven Trees, CaliforniaSat, Apr 11, 7:08 PM PST · 16608 days ago · 1 km deep · 64 km away
3. 1.60 km W of Moskowite Corner, CaliforniaSun, Apr 12, 9:18 PM PST · 16607 days ago · 16 km deep · 72 km away
4. 1.65 km ENE of San Martin, CaliforniaTue, Apr 14, 2:43 PM PST · 16606 days ago · 3 km deep · 88 km away
5. 1.822 km SE of Livermore, CaliforniaTue, Apr 14, 2:54 PM PST · 16606 days ago · 2 km deep · 42 km away
6. 1.78 km ESE of Blackhawk, CaliforniaSun, Apr 19, 10:59 PM PST · 16600 days ago · 7 km deep · 7 km away
7. 1.97 km SE of Sunol, CaliforniaWed, Apr 22, 2:07 AM PST · 16598 days ago · 5 km deep · 34 km away
8. 1.72 km NW of Orinda, CaliforniaWed, Apr 22, 11:57 AM PST · 16598 days ago · 11 km deep · 29 km away
9. 1.82 km NNW of Brentwood, CaliforniaThu, Apr 23, 11:37 PM PST · 16596 days ago · 0 km deep · 18 km away
10. 1.68 km SSW of Antioch, CaliforniaFri, Apr 24, 12:54 AM PST · 16596 days ago · 0 km deep · 10 km away
11. 1.67 km NNE of East Foothills, CaliforniaSat, Apr 25, 10:09 AM PST · 16595 days ago · 11 km deep · 46 km away
12. 4.18 km N of Day Valley, CaliforniaSat, Apr 25, 11:41 AM PST · 16595 days ago · 13 km deep · 82 km away
13. 2.616 km N of Morgan Hill, CaliforniaMon, Apr 27, 4:09 PM PDT · 16593 days ago · 6 km deep · 66 km away
14. 1.77 km W of Mountain House, CaliforniaWed, Apr 29, 4:02 AM PDT · 16591 days ago · 9 km deep · 22 km away
15. 1.82 km S of Rancho Calaveras, CaliforniaWed, Apr 29, 4:02 AM PDT · 16591 days ago · 38 km deep · 93 km away
16. 1.69 km ESE of East Foothills, CaliforniaWed, Apr 29, 6:22 AM PDT · 16591 days ago · 8 km deep · 56 km away
17. 2.29 km ESE of East Foothills, CaliforniaWed, Apr 29, 6:28 AM PDT · 16591 days ago · 8 km deep · 56 km away
18. 1.78 km W of Gilroy, CaliforniaFri, May 1, 11:20 AM PDT · 16589 days ago · 7 km deep · 95 km away
19. 2.03 km SW of Broadmoor, CaliforniaSun, May 3, 3:45 PM PDT · 16587 days ago · 7 km deep · 60 km away
20. 1.66 km WSW of Pescadero, CaliforniaSun, May 3, 9:33 PM PDT · 16586 days ago · 6 km deep · 86 km away
21. 1.58 km NE of Gilroy, CaliforniaMon, May 4, 4:25 AM PDT · 16586 days ago · 3 km deep · 94 km away
22. 1.7Northern CaliforniaThu, May 7, 12:58 AM PDT · 16583 days ago · 9 km deep · 92 km away
23. 1.97 km S of Calistoga, CaliforniaFri, May 8, 5:59 AM PDT · 16582 days ago · 8 km deep · 97 km away
24. 2.714 km E of East Foothills, CaliforniaFri, May 8, 3:24 PM PDT · 16582 days ago · 6 km deep · 57 km away
25. 1.89 km ENE of Gilroy, CaliforniaSat, May 9, 7:35 PM PDT · 16580 days ago · 8 km deep · 98 km away
26. 2.420 km SW of Diablo Grande, CaliforniaSun, May 10, 12:50 AM PDT · 16580 days ago · 72 km deep · 71 km away
27. 1.79 km E of Gilroy, CaliforniaSun, May 10, 7:25 AM PDT · 16580 days ago · 8 km deep · 99 km away
28. 2.82 km ENE of San Leandro, CaliforniaMon, May 11, 4:50 AM PDT · 16579 days ago · 11 km deep · 26 km away
29. 1.70 km NNW of Concord, CaliforniaMon, May 11, 2:18 PM PDT · 16579 days ago · 13 km deep · 21 km away
30. 1.611 km ESE of East Foothills, CaliforniaTue, May 12, 8:59 PM PDT · 16577 days ago · 7 km deep · 59 km away
31. 2.29 km ENE of Gilroy, CaliforniaWed, May 13, 10:10 PM PDT · 16576 days ago · 9 km deep · 96 km away
32. 2.314 km S of Guinda, CaliforniaThu, May 14, 12:37 PM PDT · 16576 days ago · 4 km deep · 100 km away
33. 2.313 km WSW of Esparto, CaliforniaThu, May 14, 1:57 PM PDT · 16576 days ago · 4 km deep · 95 km away
34. 1.611 km E of Blackhawk, CaliforniaFri, May 15, 2:03 PM PDT · 16575 days ago · 11 km deep · 8 km away
35. 1.63 km NNE of Union City, CaliforniaFri, May 15, 5:27 PM PDT · 16575 days ago · 7 km deep · 27 km away
36. 1.913 km N of Morgan Hill, CaliforniaFri, May 15, 7:08 PM PDT · 16574 days ago · 3 km deep · 70 km away
37. 1.910 km SW of Brentwood, CaliforniaFri, May 15, 10:18 PM PDT · 16574 days ago · 19 km deep · 8 km away
38. 1.710 km SSW of Brentwood, CaliforniaFri, May 15, 11:15 PM PDT · 16574 days ago · 21 km deep · 9 km away
39. 1.811 km SW of Brentwood, CaliforniaSat, May 16, 5:21 AM PDT · 16574 days ago · 20 km deep · 8 km away
40. 2.110 km ESE of East Foothills, CaliforniaSat, May 16, 8:53 AM PDT · 16574 days ago · 7 km deep · 57 km away
41. 3.00 km ESE of North Gate, CaliforniaMon, May 18, 7:39 AM PDT · 16572 days ago · 12 km deep · 13 km away
42. 1.815 km E of Seven Trees, CaliforniaMon, May 18, 8:49 AM PDT · 16572 days ago · 5 km deep · 64 km away
43. 1.512 km E of Angwin, CaliforniaTue, May 19, 7:17 PM PDT · 16570 days ago · 5 km deep · 91 km away
44. 1.60 km W of Broadmoor, CaliforniaWed, May 20, 5:41 PM PDT · 16570 days ago · 11 km deep · 58 km away
45. 1.81 km NW of Emerald Lake Hills, CaliforniaThu, May 21, 10:55 PM PDT · 16568 days ago · 3 km deep · 55 km away
46. 2.59 km NE of Gilroy, CaliforniaSat, May 23, 11:50 AM PDT · 16567 days ago · 9 km deep · 92 km away
47. 1.83 km E of Union City, CaliforniaSun, May 24, 9:36 PM PDT · 16565 days ago · 7 km deep · 30 km away
48. 1.815 km SE of Livermore, CaliforniaMon, May 25, 5:04 AM PDT · 16565 days ago · 2 km deep · 35 km away
49. 2.78 km NNE of East Foothills, CaliforniaTue, May 26, 9:01 AM PDT · 16564 days ago · 7 km deep · 44 km away
50. 1.50 km SE of North Gate, CaliforniaTue, May 26, 1:09 PM PDT · 16564 days ago · 10 km deep · 13 km away
51. 1.79 km NE of Gilroy, CaliforniaTue, May 26, 2:23 PM PDT · 16564 days ago · 8 km deep · 93 km away
52. 1.99 km ENE of Gilroy, CaliforniaWed, May 27, 2:35 AM PDT · 16563 days ago · 8 km deep · 97 km away
53. 2.26 km ENE of East Foothills, CaliforniaWed, May 27, 3:04 AM PDT · 16563 days ago · 9 km deep · 51 km away
54. 1.66 km ENE of East Foothills, CaliforniaWed, May 27, 3:05 AM PDT · 16563 days ago · 9 km deep · 51 km away
55. 2.46 km NE of East Foothills, CaliforniaWed, May 27, 8:19 AM PDT · 16563 days ago · 7 km deep · 49 km away
56. 1.94 km SSW of Lagunitas-Forest Knolls, CaliforniaThu, May 28, 5:36 PM PDT · 16562 days ago · 0 km deep · 75 km away
57. 2.211 km SW of Brentwood, CaliforniaSat, May 30, 11:17 AM PDT · 16560 days ago · 19 km deep · 8 km away
58. 1.611 km ESE of East Foothills, CaliforniaSat, May 30, 11:04 PM PDT · 16559 days ago · 7 km deep · 59 km away
59. 1.810 km SW of Brentwood, CaliforniaSun, May 31, 9:35 AM PDT · 16559 days ago · 15 km deep · 9 km away
60. 1.55 km E of Fremont, CaliforniaSun, May 31, 4:16 PM PDT · 16559 days ago · 8 km deep · 34 km away

The first 60 of 76.

Before

1. 1.912 km N of Livermore, CaliforniaTue, Apr 7, 3:30 AM PST · 16613 days ago · 10 km deep · 12 km away
2. 1.53 km NNE of Pleasanton, CaliforniaTue, Apr 7, 2:32 AM PST · 16613 days ago · 14 km deep · 17 km away
3. 1.53 km WSW of Campbell, CaliforniaMon, Apr 6, 6:39 AM PST · 16614 days ago · 4 km deep · 64 km away
4. 1.58 km E of East Foothills, CaliforniaMon, Apr 6, 4:16 AM PST · 16614 days ago · 8 km deep · 55 km away
5. 1.74 km W of Westley, CaliforniaMon, Apr 6, 2:48 AM PST · 16614 days ago · 8 km deep · 64 km away
6. 1.59 km NE of Gilroy, CaliforniaSun, Apr 5, 1:30 AM PST · 16615 days ago · 8 km deep · 93 km away
7. 1.616 km SSE of Livermore, CaliforniaSat, Apr 4, 8:49 PM PST · 16615 days ago · -1 km deep · 36 km away
8. 1.62 km NW of Bonny Doon, CaliforniaFri, Apr 3, 3:29 PM PST · 16617 days ago · 12 km deep · 92 km away
9. 1.96 km S of Sunol, CaliforniaThu, Apr 2, 10:32 AM PST · 16618 days ago · 9 km deep · 35 km away
10. 1.68 km NE of San Martin, CaliforniaThu, Apr 2, 1:30 AM PST · 16618 days ago · 6 km deep · 84 km away
11. 1.515 km SSE of Livermore, CaliforniaSat, Mar 28, 10:31 AM PST · 16623 days ago · 2 km deep · 36 km away
12. 1.710 km E of San Martin, CaliforniaSat, Mar 28, 8:25 AM PST · 16623 days ago · 9 km deep · 91 km away
13. 1.614 km SSE of Livermore, CaliforniaThu, Mar 26, 8:03 AM PST · 16625 days ago · 2 km deep · 35 km away
14. 1.713 km N of Morgan Hill, CaliforniaWed, Mar 25, 6:33 PM PST · 16625 days ago · 6 km deep · 69 km away
15. 3.114 km SSE of Livermore, CaliforniaWed, Mar 25, 8:58 AM PST · 16626 days ago · 2 km deep · 35 km away
16. 2.06 km ESE of Roseland, CaliforniaTue, Mar 24, 9:19 PM PST · 16626 days ago · 8 km deep · 93 km away
17. 1.69 km NE of San Martin, CaliforniaTue, Mar 24, 6:00 PM PST · 16626 days ago · 7 km deep · 83 km away
18. 2.23 km NNW of Castro Valley, CaliforniaMon, Mar 23, 9:38 PM PST · 16627 days ago · 10 km deep · 24 km away
19. 2.37 km E of East Foothills, CaliforniaMon, Mar 23, 1:34 AM PST · 16628 days ago · 8 km deep · 54 km away
20. 2.314 km E of Seven Trees, CaliforniaSun, Mar 22, 6:44 AM PST · 16629 days ago · 4 km deep · 64 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1062371. Read Thu, Oct 1, 2026, 12:11 PM UTC.