M1.6 earthquake 13 km SE of Sunol, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Jul 28, 1983, 6:26 AM PDT

UTC

1983-07-28 13:26:01 UTC

Depth

4.3 km (2.7 mi), shallow

Epicenter

37.521° N, 121.771° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.2 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

84°

Stations used

22

• Sunol, CaliforniaPopulation 913. Forecast13 kmSE
• Milpitas, CaliforniaPopulation 77,604. Forecast16 kmNE
• Fremont, CaliforniaPopulation 232,206. Forecast19 kmE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast500 kmNW

After

1. 1.69 km ESE of East Foothills, CaliforniaThu, Jul 28, 8:18 AM PDT · 15771 days ago · 8 km deep · 19 km away
2. 2.811 km SW of Muir Beach, CaliforniaThu, Jul 28, 11:59 AM PDT · 15771 days ago · 6 km deep · 83 km away
3. 2.916 km NE of East Foothills, CaliforniaThu, Jul 28, 5:03 PM PDT · 15771 days ago · 6 km deep · 11 km away
4. 2.59 km NE of Gilroy, CaliforniaThu, Jul 28, 6:06 PM PDT · 15771 days ago · 7 km deep · 56 km away
5. 2.65 km NE of Tres Pinos, CaliforniaSat, Jul 30, 8:14 PM PDT · 15769 days ago · 4 km deep · 88 km away
6. 3.18 km SE of San Juan Bautista, CaliforniaSat, Jul 30, 11:01 PM PDT · 15769 days ago · 5 km deep · 86 km away
7. 2.515 km SE of Livermore, CaliforniaSun, Jul 31, 9:58 PM PDT · 15768 days ago · 2 km deep · 11 km away
8. 2.622 km ENE of Tres Pinos, CaliforniaMon, Aug 1, 6:00 AM PDT · 15767 days ago · 0 km deep · 96 km away
9. 1.91 km W of Broadmoor, CaliforniaTue, Aug 2, 12:34 AM PDT · 15767 days ago · 10 km deep · 66 km away
10. 2.39 km ESE of East Foothills, CaliforniaTue, Aug 2, 1:02 AM PDT · 15767 days ago · 3 km deep · 20 km away
11. 2.06 km SE of Tres Pinos, CaliforniaTue, Aug 2, 6:13 AM PDT · 15766 days ago · 9 km deep · 96 km away
12. 1.99 km ESE of East Foothills, CaliforniaTue, Aug 2, 8:18 AM PDT · 15766 days ago · 3 km deep · 20 km away
13. 2.02 km E of North Gate, CaliforniaThu, Aug 4, 9:15 AM PDT · 15764 days ago · 11 km deep · 46 km away
14. 2.39 km ESE of East Foothills, CaliforniaFri, Aug 5, 12:33 PM PDT · 15763 days ago · 7 km deep · 20 km away
15. 1.69 km ESE of East Foothills, CaliforniaFri, Aug 5, 12:34 PM PDT · 15763 days ago · 7 km deep · 19 km away
16. 1.58 km E of East Foothills, CaliforniaSat, Aug 6, 2:27 AM PDT · 15763 days ago · 7 km deep · 17 km away
17. 1.71 km E of Tres Pinos, CaliforniaSat, Aug 6, 8:12 PM PDT · 15762 days ago · 8 km deep · 91 km away
18. 2.01 km E of Alamo, CaliforniaSun, Aug 7, 1:34 AM PDT · 15762 days ago · 9 km deep · 42 km away
19. 2.02 km E of Pacifica, CaliforniaMon, Aug 8, 4:17 AM PDT · 15761 days ago · 8 km deep · 61 km away
20. 1.63 km WSW of San Bruno, CaliforniaMon, Aug 8, 7:26 AM PDT · 15760 days ago · 8 km deep · 61 km away
21. 2.22 km SW of Pittsburg, CaliforniaMon, Aug 8, 3:12 PM PDT · 15760 days ago · 15 km deep · 56 km away
22. 1.50 km WSW of Pittsburg, CaliforniaMon, Aug 8, 5:09 PM PDT · 15760 days ago · 17 km deep · 57 km away
23. 1.95 km SW of Mountain House, CaliforniaTue, Aug 9, 9:42 AM PDT · 15759 days ago · 6 km deep · 30 km away
24. 2.15 km SW of Gilroy, CaliforniaTue, Aug 9, 9:36 PM PDT · 15759 days ago · 4 km deep · 62 km away
25. 1.6Central CaliforniaWed, Aug 10, 11:29 AM PDT · 15758 days ago · 3 km deep · 63 km away
26. 1.515 km SE of Livermore, CaliforniaFri, Aug 12, 7:12 PM PDT · 15756 days ago · 4 km deep · 11 km away
27. 2.410 km ENE of Blackhawk, CaliforniaSat, Aug 13, 4:19 PM PDT · 15755 days ago · 9 km deep · 37 km away
28. 2.110 km ENE of Blackhawk, CaliforniaSun, Aug 14, 12:39 AM PDT · 15755 days ago · 10 km deep · 37 km away
29. 2.35 km NNE of Ridgemark, CaliforniaSun, Aug 14, 11:15 PM PDT · 15754 days ago · 6 km deep · 83 km away
30. 2.17 km E of East Foothills, CaliforniaMon, Aug 15, 7:29 PM PDT · 15753 days ago · 9 km deep · 16 km away
31. 1.69 km ENE of San Martin, CaliforniaMon, Aug 15, 10:45 PM PDT · 15753 days ago · 9 km deep · 49 km away
32. 1.612 km ESE of Gilroy, CaliforniaTue, Aug 16, 9:21 AM PDT · 15752 days ago · 7 km deep · 68 km away
33. 2.01 km E of Pacheco, CaliforniaWed, Aug 17, 3:27 PM PDT · 15751 days ago · 12 km deep · 57 km away
34. 3.25 km NNE of Ridgemark, CaliforniaThu, Aug 18, 1:54 AM PDT · 15751 days ago · 6 km deep · 83 km away
35. 2.65 km NNE of Ridgemark, CaliforniaThu, Aug 18, 2:00 AM PDT · 15751 days ago · 6 km deep · 83 km away
36. 1.65 km NNE of Ridgemark, CaliforniaThu, Aug 18, 2:11 AM PDT · 15751 days ago · 4 km deep · 83 km away
37. 2.25 km NNE of Ridgemark, CaliforniaThu, Aug 18, 2:48 AM PDT · 15751 days ago · 5 km deep · 83 km away
38. 1.611 km SSE of Livermore, CaliforniaFri, Aug 19, 5:00 AM PDT · 15750 days ago · 6 km deep · 9 km away
39. 2.34 km ENE of La Honda, CaliforniaFri, Aug 19, 11:57 AM PDT · 15749 days ago · 0 km deep · 46 km away
40. 1.85 km SSW of Tres Pinos, CaliforniaFri, Aug 19, 11:31 PM PDT · 15749 days ago · 6 km deep · 94 km away
41. 1.912 km N of Livermore, CaliforniaFri, Aug 19, 11:32 PM PDT · 15749 days ago · 11 km deep · 31 km away
42. 3.12 km ESE of Aromas, CaliforniaSun, Aug 21, 7:21 AM PDT · 15747 days ago · 7 km deep · 72 km away
43. 2.12 km E of Aromas, CaliforniaSun, Aug 21, 7:28 AM PDT · 15747 days ago · 6 km deep · 72 km away
44. 1.82 km E of Aromas, CaliforniaSun, Aug 21, 10:45 AM PDT · 15747 days ago · 7 km deep · 72 km away
45. 1.82 km ESE of Aromas, CaliforniaSun, Aug 21, 10:46 AM PDT · 15747 days ago · 7 km deep · 73 km away
46. 3.24 km S of San Juan Bautista, CaliforniaSun, Aug 21, 9:17 PM PDT · 15747 days ago · 7 km deep · 82 km away
47. 1.612 km ESE of East Foothills, CaliforniaMon, Aug 22, 5:47 AM PDT · 15746 days ago · 4 km deep · 23 km away
48. 2.92 km ESE of Aromas, CaliforniaMon, Aug 22, 6:29 AM PDT · 15746 days ago · 6 km deep · 72 km away
49. 1.625 km WSW of Volta, CaliforniaTue, Aug 23, 7:40 AM PDT · 15745 days ago · 4 km deep · 72 km away
50. 2.33 km SSE of San Juan Bautista, CaliforniaTue, Aug 23, 10:21 AM PDT · 15745 days ago · 4 km deep · 82 km away
51. 1.67 km E of East Foothills, CAWed, Aug 24, 12:49 PM PDT · 15744 days ago · 7 km deep · 15 km away
52. 2.118 km ESE of Livermore, CaliforniaThu, Aug 25, 9:38 PM PDT · 15743 days ago · 4 km deep · 18 km away
53. 2.15 km SSW of Ridgemark, CaliforniaFri, Aug 26, 4:37 PM PDT · 15742 days ago · 9 km deep · 91 km away
54. 2.63 km SSE of San Juan Bautista, CaliforniaSat, Aug 27, 7:41 AM PDT · 15741 days ago · 4 km deep · 82 km away
55. 2.31 km NNE of Diablo, CaliforniaTue, Aug 30, 1:33 AM PDT · 15739 days ago · 9 km deep · 39 km away
56. 2.12 km SSW of Pittsburg, CaliforniaTue, Aug 30, 5:33 AM PDT · 15738 days ago · 16 km deep · 55 km away
57. 1.69 km ENE of Milpitas, CaliforniaWed, Aug 31, 9:11 AM PDT · 15737 days ago · 7 km deep · 7 km away
58. 1.64 km S of San Juan Bautista, CaliforniaWed, Aug 31, 1:13 PM PDT · 15737 days ago · 6 km deep · 82 km away
59. 1.7Northern CaliforniaWed, Aug 31, 8:37 PM PDT · 15737 days ago · 13 km deep · 89 km away
60. 2.69 km NE of Gilroy, CaliforniaFri, Sep 2, 6:37 AM PDT · 15735 days ago · 8 km deep · 58 km away

The first 60 of 99.

Before

1. 1.99 km NE of San Martin, CaliforniaThu, Jul 28, 2:40 AM PDT · 15772 days ago · 7 km deep · 47 km away
2. 2.03 km N of East Foothills, CaliforniaWed, Jul 27, 4:14 PM PDT · 15772 days ago · 0 km deep · 12 km away
3. 1.817 km ENE of East Foothills, CaliforniaTue, Jul 26, 9:34 PM PDT · 15773 days ago · 5 km deep · 16 km away
4. 2.514 km NE of Morgan Hill, CaliforniaTue, Jul 26, 9:05 AM PDT · 15773 days ago · 7 km deep · 40 km away
5. 1.69 km NW of Hollister, CaliforniaMon, Jul 25, 11:55 PM PDT · 15774 days ago · 5 km deep · 72 km away
6. 2.12 km E of San Leandro, CaliforniaMon, Jul 25, 3:30 PM PDT · 15774 days ago · 2 km deep · 39 km away
7. 1.610 km WSW of Ridgemark, CaliforniaFri, Jul 22, 1:03 AM PDT · 15778 days ago · 6 km deep · 88 km away
8. 1.81 km SSW of Alamo, CaliforniaThu, Jul 21, 9:23 PM PDT · 15778 days ago · 6 km deep · 42 km away
9. 2.19 km NE of Blackhawk, CaliforniaSun, Jul 17, 2:06 PM PDT · 15782 days ago · 1 km deep · 40 km away
10. 1.914 km E of Seven Trees, CaliforniaFri, Jul 15, 3:12 AM PDT · 15785 days ago · 2 km deep · 27 km away
11. 1.75 km NE of Interlaken, CaliforniaThu, Jul 14, 9:22 PM PDT · 15785 days ago · 12 km deep · 60 km away
12. 2.314 km E of Seven Trees, CaliforniaThu, Jul 14, 6:40 PM PDT · 15785 days ago · 8 km deep · 25 km away
13. 2.44 km NNW of San Leandro, CaliforniaThu, Jul 14, 12:27 AM PDT · 15786 days ago · 11 km deep · 45 km away
14. 1.62 km ENE of Pacifica, CaliforniaWed, Jul 13, 9:37 PM PDT · 15786 days ago · 7 km deep · 62 km away
15. 1.87 km NE of Interlaken, CaliforniaTue, Jul 12, 11:22 AM PDT · 15787 days ago · 4 km deep · 59 km away
16. 2.42 km E of East Foothills, CaliforniaMon, Jul 11, 6:03 AM PDT · 15788 days ago · 5 km deep · 15 km away
17. 1.623 km ENE of Tres Pinos, CaliforniaMon, Jul 11, 3:06 AM PDT · 15789 days ago · 0 km deep · 96 km away
18. 1.820 km SSE of Livermore, CaliforniaSat, Jul 9, 3:56 PM PDT · 15790 days ago · 6 km deep · 11 km away
19. 1.84 km ESE of Aromas, CaliforniaSat, Jul 9, 11:22 AM PDT · 15790 days ago · 6 km deep · 75 km away
20. 2.88 km NE of Corralitos, CaliforniaSat, Jul 9, 1:32 AM PDT · 15791 days ago · 12 km deep · 54 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1099437. Read Thu, Oct 1, 2026, 11:33 PM UTC.