M1.9 earthquake 12 km WSW of Byron, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Aug 18, 1982, 7:50 PM PDT

UTC

1982-08-19 02:50:51 UTC

Depth

14.6 km (9.1 mi), shallow

Epicenter

37.819° N, 121.766° 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

±0.22

Depth from

From location

Station coverage gap

128°

Stations used

43

• Byron, CaliforniaPopulation 1,277. Forecast12 kmWSW
• Brentwood, CaliforniaPopulation 58,968. Forecast14 kmSSW
• Antioch, CaliforniaPopulation 110,542. Forecast21 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast525 kmNW

After

1. 1.60 km SSE of Concord, CaliforniaWed, Aug 18, 9:01 PM PDT · 16117 days ago · 11 km deep · 28 km away
2. 3.31 km SW of Dublin, CaliforniaThu, Aug 19, 4:04 AM PDT · 16117 days ago · 10 km deep · 22 km away
3. 1.80 km SSE of Concord, CaliforniaThu, Aug 19, 9:22 AM PDT · 16117 days ago · 13 km deep · 28 km away
4. 3.32 km SSW of Dublin, CaliforniaSat, Aug 21, 7:31 AM PDT · 16115 days ago · 10 km deep · 23 km away
5. 1.813 km SE of Livermore, CaliforniaSun, Aug 22, 1:55 AM PDT · 16114 days ago · 6 km deep · 26 km away
6. 1.714 km NNE of Morgan Hill, CaliforniaMon, Aug 23, 8:37 AM PDT · 16113 days ago · 7 km deep · 65 km away
7. 1.92 km NNW of Kensington, CaliforniaMon, Aug 23, 9:41 AM PDT · 16113 days ago · 9 km deep · 47 km away
8. 1.87 km E of East Foothills, CaliforniaMon, Aug 23, 5:21 PM PDT · 16113 days ago · 9 km deep · 48 km away
9. 3.98 km N of East Foothills, CaliforniaTue, Aug 24, 3:33 PM PDT · 16112 days ago · 6 km deep · 40 km away
10. 1.91 km N of Orinda, CaliforniaWed, Aug 25, 9:41 PM PDT · 16110 days ago · 6 km deep · 37 km away
11. 2.75 km SSW of Gilroy, CaliforniaThu, Aug 26, 9:29 AM PDT · 16110 days ago · 4 km deep · 97 km away
12. 1.814 km E of East Foothills, CaliforniaFri, Aug 27, 10:48 AM PDT · 16109 days ago · 5 km deep · 47 km away
13. 1.710 km E of Blackhawk, CaliforniaFri, Aug 27, 5:56 PM PDT · 16109 days ago · 10 km deep · 2 km away
14. 3.812 km E of Blackhawk, CaliforniaFri, Aug 27, 6:03 PM PDT · 16109 days ago · 15 km deep · 2 km away
15. 2.311 km E of Blackhawk, CaliforniaFri, Aug 27, 7:11 PM PDT · 16109 days ago · 11 km deep · 1 km away
16. 2.611 km E of Blackhawk, CaliforniaFri, Aug 27, 9:52 PM PDT · 16108 days ago · 14 km deep · 2 km away
17. 1.610 km E of Blackhawk, CaliforniaSat, Aug 28, 5:12 AM PDT · 16108 days ago · 10 km deep · 3 km away
18. 1.810 km E of Blackhawk, CaliforniaSat, Aug 28, 5:50 AM PDT · 16108 days ago · 10 km deep · 3 km away
19. 1.55 km NNE of Kenwood, CaliforniaSat, Aug 28, 10:39 PM PDT · 16107 days ago · 5 km deep · 97 km away
20. 1.97 km WSW of Gilroy, CaliforniaSun, Aug 29, 4:25 AM PDT · 16107 days ago · 5 km deep · 93 km away
21. 2.17 km WSW of Gilroy, CaliforniaSun, Aug 29, 4:30 AM PDT · 16107 days ago · 5 km deep · 94 km away
22. 2.03 km NE of Fremont, CaliforniaMon, Aug 30, 12:21 AM PDT · 16106 days ago · 9 km deep · 32 km away
23. 1.65 km WSW of Green Valley, CaliforniaMon, Aug 30, 9:02 AM PDT · 16106 days ago · 5 km deep · 61 km away
24. 2.31 km SSE of Concord, CaliforniaTue, Aug 31, 11:40 AM PDT · 16105 days ago · 12 km deep · 28 km away
25. 1.70 km N of Pittsburg, CaliforniaWed, Sep 1, 2:04 AM PDT · 16104 days ago · 16 km deep · 26 km away
26. 1.72 km E of East Foothills, CaliforniaSun, Sep 5, 3:22 AM PDT · 16100 days ago · 4 km deep · 48 km away
27. 1.98 km ENE of Milpitas, CaliforniaSun, Sep 5, 7:55 PM PDT · 16100 days ago · 2 km deep · 40 km away
28. 2.30 km SE of Concord, CaliforniaMon, Sep 6, 4:15 AM PDT · 16099 days ago · 7 km deep · 28 km away
29. 1.74 km WNW of Newman, CaliforniaMon, Sep 6, 7:44 AM PDT · 16099 days ago · 12 km deep · 82 km away
30. 1.710 km ENE of Blackhawk, CaliforniaMon, Sep 6, 9:45 AM PDT · 16099 days ago · 12 km deep · 3 km away
31. 1.65 km WNW of Newman, CaliforniaMon, Sep 6, 1:25 PM PDT · 16099 days ago · 5 km deep · 81 km away
32. 1.64 km SW of Saint Helena, CaliforniaTue, Sep 7, 4:54 PM PDT · 16098 days ago · 5 km deep · 97 km away
33. 1.811 km NW of Moskowite Corner, CaliforniaWed, Sep 8, 12:48 AM PDT · 16097 days ago · -1 km deep · 90 km away
34. 2.16 km WSW of Gilroy, CaliforniaWed, Sep 8, 6:44 PM PDT · 16097 days ago · 5 km deep · 94 km away
35. 1.515 km N of Morgan Hill, CaliforniaFri, Sep 10, 3:14 AM PDT · 16095 days ago · 6 km deep · 62 km away
36. 3.16 km ENE of East Foothills, CaliforniaSat, Sep 11, 4:59 AM PDT · 16094 days ago · 8 km deep · 46 km away
37. 1.86 km ENE of East Foothills, CaliforniaSat, Sep 11, 5:01 AM PDT · 16094 days ago · 7 km deep · 46 km away
38. 2.23 km WSW of Clayton, CaliforniaSat, Sep 11, 9:44 PM PDT · 16093 days ago · 13 km deep · 22 km away
39. 2.07 km NNE of East Foothills, CaliforniaWed, Sep 15, 9:11 AM PDT · 16090 days ago · 7 km deep · 41 km away
40. 2.411 km ESE of East Foothills, CaliforniaThu, Sep 16, 9:02 PM PDT · 16088 days ago · 8 km deep · 53 km away
41. 1.82 km ENE of Inverness, CaliforniaSat, Sep 18, 3:38 PM PDT · 16087 days ago · 2 km deep · 99 km away
42. 1.89 km N of East Foothills, CaliforniaSun, Sep 19, 1:29 AM PDT · 16086 days ago · 6 km deep · 40 km away
43. 1.79 km NE of San Martin, CaliforniaSun, Sep 19, 7:55 AM PDT · 16086 days ago · 8 km deep · 79 km away
44. 1.914 km N of Morgan Hill, CaliforniaSun, Sep 19, 3:36 PM PDT · 16086 days ago · 5 km deep · 63 km away
45. 1.64 km ESE of San Ramon, CaliforniaThu, Sep 23, 9:33 PM PDT · 16081 days ago · 8 km deep · 16 km away
46. 1.93 km W of Livermore, CaliforniaSat, Sep 25, 5:46 AM PDT · 16080 days ago · 14 km deep · 16 km away
47. 1.817 km NE of East Foothills, CaliforniaSat, Sep 25, 3:44 PM PDT · 16080 days ago · 7 km deep · 35 km away
48. 2.15 km SSW of Gilroy, CaliforniaSat, Sep 25, 8:33 PM PDT · 16080 days ago · 4 km deep · 97 km away
49. 1.84 km WSW of Moskowite Corner, CaliforniaSun, Sep 26, 3:17 AM PDT · 16079 days ago · 9 km deep · 80 km away
50. 1.86 km WSW of Gilroy, CaliforniaSun, Sep 26, 12:01 PM PDT · 16079 days ago · 5 km deep · 93 km away
51. 1.513 km N of Morgan Hill, CaliforniaMon, Sep 27, 7:41 AM PDT · 16078 days ago · 7 km deep · 64 km away
52. 2.08 km ENE of Gilroy, CaliforniaMon, Sep 27, 3:40 PM PDT · 16078 days ago · 8 km deep · 89 km away
53. 1.55 km SE of Cambrian Park, CaliforniaMon, Sep 27, 6:54 PM PDT · 16078 days ago · 0 km deep · 68 km away
54. 2.210 km SW of Brentwood, CaliforniaFri, Oct 1, 1:36 PM PDT · 16074 days ago · 15 km deep · 4 km away
55. 2.13 km ENE of Berkeley, CaliforniaSat, Oct 2, 1:06 AM PDT · 16073 days ago · 9 km deep · 42 km away
56. 1.58 km ESE of East Foothills, CaliforniaSat, Oct 2, 11:23 PM PDT · 16072 days ago · 7 km deep · 52 km away
57. 2.19 km ENE of San Martin, CaliforniaSun, Oct 3, 2:14 AM PDT · 16072 days ago · 7 km deep · 81 km away
58. 1.614 km E of Seven Trees, CaliforniaFri, Oct 8, 2:07 AM PDT · 16067 days ago · 3 km deep · 59 km away
59. 1.71 km NE of Pacheco, CaliforniaFri, Oct 8, 6:05 AM PDT · 16067 days ago · 14 km deep · 33 km away
60. 2.04 km NNE of Fremont, CaliforniaSat, Oct 9, 3:59 AM PDT · 16066 days ago · 9 km deep · 32 km away

The first 60 of 66.

Before

1. 1.71 km S of Concord, CaliforniaWed, Aug 18, 5:11 PM PDT · 16118 days ago · 11 km deep · 28 km away
2. 1.72 km SW of Dublin, CaliforniaWed, Aug 18, 4:59 PM PDT · 16118 days ago · 9 km deep · 22 km away
3. 4.58 km NE of Corralitos, CaliforniaWed, Aug 18, 1:43 AM PDT · 16118 days ago · 12 km deep · 87 km away
4. 4.313km W of Bonny Doon, CAWed, Aug 18, 1:43 AM PDT · 16118 days ago · 14 km deep · 99 km away
5. 2.70 km SE of Concord, CaliforniaTue, Aug 17, 11:34 AM PDT · 16119 days ago · 14 km deep · 28 km away
6. 1.98 km WSW of Gilroy, CaliforniaSun, Aug 15, 5:58 PM PDT · 16121 days ago · 3 km deep · 93 km away
7. 1.98 km ENE of Interlaken, CaliforniaSun, Aug 15, 5:42 PM PDT · 16121 days ago · 3 km deep · 93 km away
8. 1.68 km N of Day Valley, CaliforniaSat, Aug 14, 12:19 PM PDT · 16122 days ago · 12 km deep · 79 km away
9. 1.54 km NNE of Vine Hill, CaliforniaFri, Aug 13, 5:38 PM PDT · 16123 days ago · 16 km deep · 37 km away
10. 2.44 km SW of Green Valley, CaliforniaFri, Aug 13, 12:43 PM PDT · 16123 days ago · 12 km deep · 58 km away
11. 1.97 km NE of Interlaken, CaliforniaFri, Aug 13, 4:00 AM PDT · 16123 days ago · 3 km deep · 92 km away
12. 1.68 km WSW of Gilroy, CaliforniaThu, Aug 12, 7:17 PM PDT · 16124 days ago · 2 km deep · 93 km away
13. 2.812 km WSW of Byron, CaliforniaTue, Aug 10, 10:03 PM PDT · 16125 days ago · 16 km deep · 1 km away
14. 1.55 km ESE of East Foothills, CaliforniaMon, Aug 9, 11:40 AM PDT · 16127 days ago · 2 km deep · 50 km away
15. 1.92 km NW of Glen Ellen, CaliforniaMon, Aug 9, 6:22 AM PDT · 16127 days ago · 9 km deep · 92 km away
16. 1.82 km NNW of Glen Ellen, CaliforniaMon, Aug 9, 5:59 AM PDT · 16127 days ago · 10 km deep · 92 km away
17. 2.02 km NW of Glen Ellen, CaliforniaMon, Aug 9, 5:54 AM PDT · 16127 days ago · 8 km deep · 93 km away
18. 1.83 km WNW of Daly City, CaliforniaSun, Aug 8, 11:07 AM PDT · 16128 days ago · 5 km deep · 65 km away
19. 2.71 km NW of Rollingwood, CaliforniaSat, Aug 7, 9:37 AM PDT · 16129 days ago · 7 km deep · 53 km away
20. 1.9Northern CaliforniaSat, Aug 7, 4:07 AM PDT · 16129 days ago · 3 km deep · 89 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1077742. Read Sun, Oct 4, 2026, 3:27 PM UTC.