M1.6 earthquake 11 km E of Blackhawk, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Aug 26, 1981, 3:08 AM PDT

UTC

1981-08-26 10:08:39 UTC

Depth

13.3 km (8.3 mi), shallow

Epicenter

37.837° N, 121.783° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.27

Depth from

From location

Station coverage gap

103°

Stations used

19

• Blackhawk, CaliforniaPopulation 9,354. Forecast11 kmE
• Brentwood, CaliforniaPopulation 58,968. Forecast13 kmSW
• Antioch, CaliforniaPopulation 110,542. Forecast19 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast528 kmNW

After

1. 1.815 km E of Seven Trees, CaliforniaWed, Aug 26, 3:39 AM PDT · 16472 days ago · 3 km deep · 62 km away
2. 2.122 km SE of Livermore, CaliforniaWed, Aug 26, 6:45 AM PDT · 16472 days ago · 6 km deep · 37 km away
3. 3.011 km SW of Brentwood, CaliforniaThu, Aug 27, 3:01 AM PDT · 16471 days ago · 16 km deep · 2 km away
4. 1.814 km E of Seven Trees, CaliforniaThu, Aug 27, 3:25 AM PDT · 16471 days ago · 2 km deep · 61 km away
5. 2.111 km E of Blackhawk, CaliforniaThu, Aug 27, 4:10 AM PDT · 16471 days ago · 14 km deep · 1 km away
6. 2.37 km E of East Foothills, CaliforniaFri, Aug 28, 9:56 AM PDT · 16470 days ago · 6 km deep · 52 km away
7. 1.89 km ENE of Gilroy, CaliforniaSat, Aug 29, 4:37 PM PDT · 16469 days ago · 9 km deep · 93 km away
8. 2.12 km E of San Leandro, CaliforniaSat, Aug 29, 8:29 PM PDT · 16469 days ago · 5 km deep · 32 km away
9. 2.412 km N of Livermore, CaliforniaSun, Aug 30, 2:04 AM PDT · 16468 days ago · 12 km deep · 5 km away
10. 1.65 km E of Fremont, CaliforniaTue, Sep 1, 2:15 AM PDT · 16466 days ago · 9 km deep · 35 km away
11. 2.06 km S of Sunol, CaliforniaTue, Sep 1, 10:57 PM PDT · 16466 days ago · 9 km deep · 35 km away
12. 1.74 km N of Milpitas, CaliforniaWed, Sep 2, 4:48 AM PDT · 16465 days ago · 3 km deep · 42 km away
13. 1.65 km E of Fremont, CaliforniaWed, Sep 2, 6:39 AM PDT · 16465 days ago · 10 km deep · 34 km away
14. 1.518 km ESE of East Foothills, CaliforniaThu, Sep 3, 3:15 AM PDT · 16464 days ago · 1 km deep · 60 km away
15. 1.611 km ENE of Milpitas, CaliforniaThu, Sep 3, 8:57 AM PDT · 16464 days ago · 4 km deep · 39 km away
16. 1.89 km E of San Martin, CaliforniaSun, Sep 6, 10:40 AM PDT · 16461 days ago · 9 km deep · 88 km away
17. 1.611 km SSW of Loyola, CaliforniaSun, Sep 6, 11:23 AM PDT · 16461 days ago · 10 km deep · 72 km away
18. 2.19 km ENE of Morgan Hill, CaliforniaTue, Sep 8, 8:10 AM PDT · 16459 days ago · 6 km deep · 78 km away
19. 1.61 km WSW of Belmont, CaliforniaFri, Sep 11, 10:06 AM PDT · 16456 days ago · 3 km deep · 57 km away
20. 3.09 km NE of San Martin, CaliforniaSat, Sep 12, 8:49 AM PDT · 16455 days ago · 8 km deep · 79 km away
21. 2.67 km W of Gilroy, CaliforniaSun, Sep 13, 6:16 AM PDT · 16454 days ago · 4 km deep · 94 km away
22. 2.011 km SSW of Loyola, CaliforniaMon, Sep 14, 1:49 PM PDT · 16453 days ago · 9 km deep · 73 km away
23. 1.615 km N of Morgan Hill, CaliforniaWed, Sep 16, 2:30 AM PDT · 16451 days ago · 6 km deep · 65 km away
24. 1.615 km N of Morgan Hill, CaliforniaWed, Sep 16, 2:46 AM PDT · 16451 days ago · 6 km deep · 65 km away
25. 1.75 km WNW of Broadmoor, CaliforniaThu, Sep 17, 1:29 AM PDT · 16451 days ago · 4 km deep · 68 km away
26. 1.714 km E of Seven Trees, CaliforniaFri, Sep 18, 3:26 AM PDT · 16449 days ago · 4 km deep · 62 km away
27. 1.521 km ENE of East Foothills, CaliforniaSun, Sep 20, 5:23 PM PDT · 16447 days ago · 6 km deep · 44 km away
28. 2.19 km ESE of East Foothills, CaliforniaSun, Sep 20, 9:46 PM PDT · 16447 days ago · 5 km deep · 54 km away
29. 1.714 km NNW of Moskowite Corner, CaliforniaTue, Sep 22, 4:29 AM PDT · 16445 days ago · 0 km deep · 91 km away
30. 1.82 km NNE of Woodside, CaliforniaTue, Sep 22, 5:53 PM PDT · 16445 days ago · 5 km deep · 59 km away
31. 1.720 km W of Volta, CaliforniaWed, Sep 23, 9:20 AM PDT · 16444 days ago · 0 km deep · 100 km away
32. 1.88 km ENE of Blackhawk, CaliforniaWed, Sep 23, 9:25 PM PDT · 16444 days ago · 14 km deep · 3 km away
33. 1.85 km E of Fremont, CaliforniaSat, Sep 26, 10:37 AM PDT · 16441 days ago · 9 km deep · 35 km away
34. 1.75 km SSW of Gilroy, CaliforniaSat, Sep 26, 4:06 PM PDT · 16441 days ago · 4 km deep · 99 km away
35. 2.39 km ESE of East Foothills, CaliforniaSat, Sep 26, 10:41 PM PDT · 16441 days ago · 8 km deep · 55 km away
36. 2.49 km NE of Gilroy, CaliforniaSun, Sep 27, 12:57 AM PDT · 16441 days ago · 9 km deep · 89 km away
37. 2.93 km ESE of Brentwood, CaliforniaThu, Oct 1, 10:05 PM PDT · 16436 days ago · 9 km deep · 15 km away
38. 1.73 km SSW of Oakville, CaliforniaFri, Oct 2, 9:15 PM PDT · 16435 days ago · 6 km deep · 85 km away
39. 1.54 km SSE of Diablo Grande, CaliforniaSat, Oct 3, 4:17 AM PDT · 16434 days ago · 8 km deep · 70 km away
40. 1.89 km NE of Milpitas, CaliforniaSat, Oct 3, 8:29 PM PDT · 16434 days ago · 7 km deep · 38 km away
41. 2.322 km SE of Livermore, CaliforniaMon, Oct 5, 2:55 AM PDT · 16432 days ago · 7 km deep · 36 km away
42. 2.31 km NNE of Pacifica, CaliforniaMon, Oct 5, 9:02 PM PDT · 16432 days ago · 7 km deep · 66 km away
43. 1.86 km SE of Lexington Hills, CaliforniaTue, Oct 6, 12:22 AM PDT · 16432 days ago · 13 km deep · 80 km away
44. 1.81 km NNE of Pacifica, CaliforniaTue, Oct 6, 4:41 AM PDT · 16431 days ago · 7 km deep · 66 km away
45. 2.110 km SSW of Tracy, CaliforniaTue, Oct 6, 5:34 AM PDT · 16431 days ago · 9 km deep · 36 km away
46. 1.66 km SW of Gilroy, CaliforniaThu, Oct 8, 10:14 AM PDT · 16429 days ago · 5 km deep · 97 km away
47. 1.76 km NE of East Foothills, CaliforniaThu, Oct 8, 6:39 PM PDT · 16429 days ago · 8 km deep · 46 km away
48. 2.15 km NNE of San Leandro, CaliforniaFri, Oct 9, 12:24 AM PDT · 16429 days ago · 11 km deep · 31 km away
49. 1.715 km WNW of Davenport, CaliforniaFri, Oct 9, 6:54 AM PDT · 16428 days ago · 4 km deep · 96 km away
50. 1.84 km WSW of Kenwood, CaliforniaFri, Oct 9, 4:44 PM PDT · 16428 days ago · 8 km deep · 95 km away
51. 1.717 km N of Moskowite Corner, CaliforniaSun, Oct 11, 11:33 PM PDT · 16426 days ago · 8 km deep · 93 km away
52. 2.014 km N of Moskowite Corner, CaliforniaMon, Oct 12, 2:10 AM PDT · 16425 days ago · 0 km deep · 89 km away
53. 2.19 km ESE of East Foothills, CaliforniaMon, Oct 12, 5:44 PM PDT · 16425 days ago · 7 km deep · 55 km away
54. 2.010 km N of Pittsburg, CaliforniaThu, Oct 15, 1:05 AM PDT · 16423 days ago · 21 km deep · 32 km away
55. 2.03 km SSE of Brentwood, CaliforniaSat, Oct 17, 2:46 AM PDT · 16420 days ago · 2 km deep · 12 km away
56. 2.714 km E of Seven Trees, CaliforniaWed, Oct 21, 3:42 AM PDT · 16416 days ago · 7 km deep · 59 km away
57. 1.99 km NE of Gilroy, CaliforniaThu, Oct 22, 10:34 AM PDT · 16415 days ago · 8 km deep · 89 km away
58. 1.72 km NE of San Leandro, CaliforniaThu, Oct 22, 10:18 PM PDT · 16415 days ago · 3 km deep · 33 km away
59. 1.87 km SSW of Pescadero, CaliforniaFri, Oct 23, 2:56 AM PDT · 16414 days ago · 14 km deep · 90 km away
60. 1.715 km NE of Morgan Hill, CaliforniaFri, Oct 23, 8:20 AM PDT · 16414 days ago · 7 km deep · 70 km away

The first 60 of 65.

Before

1. 1.615 km E of Seven Trees, CaliforniaTue, Aug 25, 7:15 AM PDT · 16473 days ago · 3 km deep · 62 km away
2. 1.98 km ENE of San Martin, CaliforniaTue, Aug 25, 1:55 AM PDT · 16474 days ago · 5 km deep · 84 km away
3. 1.76 km ENE of East Foothills, CaliforniaFri, Aug 21, 10:04 PM PDT · 16477 days ago · 4 km deep · 49 km away
4. 1.52 km NE of Corralitos, CaliforniaThu, Aug 20, 2:40 AM PDT · 16478 days ago · 10 km deep · 92 km away
5. 1.79 km SE of Livermore, CaliforniaTue, Aug 18, 8:06 PM PDT · 16480 days ago · 8 km deep · 24 km away
6. 1.612 km WNW of Davenport, CaliforniaMon, Aug 17, 3:19 AM PDT · 16481 days ago · 4 km deep · 99 km away
7. 2.311 km SE of Sunol, CaliforniaSun, Aug 16, 3:51 AM PDT · 16482 days ago · 3 km deep · 34 km away
8. 1.65 km WSW of Gilroy, CaliforniaFri, Aug 14, 10:43 AM PDT · 16484 days ago · 4 km deep · 97 km away
9. 1.76 km SE of Lexington Hills, CaliforniaThu, Aug 13, 5:32 PM PDT · 16485 days ago · 11 km deep · 79 km away
10. 1.612 km ESE of East Foothills, CaliforniaWed, Aug 12, 4:12 PM PDT · 16486 days ago · 5 km deep · 57 km away
11. 1.6Northern CaliforniaWed, Aug 12, 1:54 PM PDT · 16486 days ago · 13 km deep · 80 km away
12. 2.110 km N of Moskowite Corner, CaliforniaWed, Aug 12, 2:23 AM PDT · 16486 days ago · 7 km deep · 86 km away
13. 1.79 km NE of San Martin, CaliforniaTue, Aug 11, 11:28 PM PDT · 16487 days ago · 8 km deep · 79 km away
14. 1.77 km E of Fairfield, CaliforniaTue, Aug 11, 9:17 PM PDT · 16487 days ago · 5 km deep · 48 km away
15. 1.76 km E of Suisun, CaliforniaTue, Aug 11, 8:28 PM PDT · 16487 days ago · 5 km deep · 47 km away
16. 1.610 km E of Gilroy, CaliforniaTue, Aug 11, 3:11 PM PDT · 16487 days ago · 5 km deep · 97 km away
17. 2.710 km ESE of East Foothills, CaliforniaTue, Aug 11, 2:41 PM PDT · 16487 days ago · 8 km deep · 55 km away
18. 1.55 km SSW of Gilroy, CaliforniaMon, Aug 10, 5:36 AM PDT · 16488 days ago · 7 km deep · 98 km away
19. 1.99 km WSW of Brentwood, CaliforniaSun, Aug 9, 7:29 AM PDT · 16489 days ago · 16 km deep · 8 km away
20. 1.87 km E of East Foothills, CaliforniaSun, Aug 9, 6:41 AM PDT · 16489 days ago · 7 km deep · 51 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1067133. Read Thu, Oct 1, 2026, 8:28 PM UTC.