M1.6 earthquake 2 km SSE of Concord, California

Magnitude

1.6 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Tue, Sep 3, 1985, 12:38 PM PDT

UTC

1985-09-03 19:38:00 UTC

Depth

10.6 km (6.6 mi), shallow

Epicenter

37.954° N, 122.019° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.7 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.05

Depth from

From location

Station coverage gap

227°, poorly surrounded by stations

Stations used

14

• Concord, CaliforniaPopulation 128,667. Forecast3 kmSSE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast551 kmNW

After

1. 3.14 km NE of San Leandro, CaliforniaTue, Sep 3, 11:00 PM PDT · 15002 days ago · 11 km deep · 24 km away
2. 2.04 km NE of San Leandro, CaliforniaTue, Sep 3, 11:09 PM PDT · 15002 days ago · 10 km deep · 24 km away
3. 3.214 km NW of Moskowite Corner, CaliforniaTue, Sep 3, 11:43 PM PDT · 15002 days ago · 4 km deep · 70 km away
4. 1.913 km NNW of Moskowite Corner, CaliforniaWed, Sep 4, 1:20 AM PDT · 15002 days ago · 1 km deep · 70 km away
5. 1.913 km NW of Moskowite Corner, CaliforniaWed, Sep 4, 2:06 AM PDT · 15002 days ago · 0 km deep · 69 km away
6. 1.64 km NE of San Leandro, CaliforniaWed, Sep 4, 10:39 PM PDT · 15001 days ago · 10 km deep · 24 km away
7. 1.910 km ESE of East Foothills, CaliforniaThu, Sep 5, 7:45 AM PDT · 15001 days ago · 7 km deep · 73 km away
8. 2.913 km NW of Moskowite Corner, CaliforniaThu, Sep 5, 10:33 AM PDT · 15001 days ago · 4 km deep · 70 km away
9. 2.713 km NW of Moskowite Corner, CaliforniaThu, Sep 5, 12:18 PM PDT · 15001 days ago · 3 km deep · 69 km away
10. 1.710 km SSE of Moskowite Corner, CaliforniaThu, Sep 5, 12:28 PM PDT · 15001 days ago · 5 km deep · 46 km away
11. 2.13 km NNW of Larkfield-Wikiup, CaliforniaThu, Sep 5, 1:21 PM PDT · 15001 days ago · 4 km deep · 92 km away
12. 1.915 km N of Morgan Hill, CaliforniaThu, Sep 5, 6:02 PM PDT · 15001 days ago · 6 km deep · 83 km away
13. 2.313 km NNW of Moskowite Corner, CaliforniaThu, Sep 5, 9:20 PM PDT · 15001 days ago · 0 km deep · 70 km away
14. 2.413 km NW of Moskowite Corner, CaliforniaThu, Sep 5, 10:36 PM PDT · 15000 days ago · 0 km deep · 69 km away
15. 2.114 km NNW of Moskowite Corner, CaliforniaThu, Sep 5, 11:39 PM PDT · 15000 days ago · 2 km deep · 70 km away
16. 2.713 km NNW of Moskowite Corner, CaliforniaFri, Sep 6, 3:01 PM PDT · 15000 days ago · 2 km deep · 70 km away
17. 1.68 km NW of Moskowite Corner, CaliforniaFri, Sep 6, 6:25 PM PDT · 15000 days ago · 2 km deep · 65 km away
18. 1.64 km NE of San Leandro, CaliforniaFri, Sep 6, 8:44 PM PDT · 15000 days ago · 11 km deep · 24 km away
19. 3.07 km E of East Foothills, CaliforniaSat, Sep 7, 10:27 AM PDT · 14999 days ago · 7 km deep · 70 km away
20. 2.67 km ESE of East Foothills, CaliforniaSat, Sep 7, 10:28 AM PDT · 14999 days ago · 7 km deep · 70 km away
21. 2.87 km ESE of East Foothills, CaliforniaSat, Sep 7, 11:03 AM PDT · 14999 days ago · 7 km deep · 70 km away
22. 2.27 km S of Sunol, CaliforniaSat, Sep 7, 5:40 PM PDT · 14999 days ago · 6 km deep · 48 km away
23. 2.37 km S of Sunol, CaliforniaSat, Sep 7, 6:35 PM PDT · 14999 days ago · 7 km deep · 49 km away
24. 2.012 km NNW of Moskowite Corner, CaliforniaSat, Sep 7, 11:33 PM PDT · 14998 days ago · 0 km deep · 69 km away
25. 1.513 km SSE of Livermore, CaliforniaSun, Sep 8, 1:17 AM PDT · 14998 days ago · 6 km deep · 51 km away
26. 1.89 km ESE of Seven Trees, CaliforniaSun, Sep 8, 6:14 PM PDT · 14998 days ago · 5 km deep · 83 km away
27. 1.59 km ESE of Hidden Valley Lake, CaliforniaMon, Sep 9, 8:59 PM PDT · 14997 days ago · 4 km deep · 98 km away
28. 1.626 km SSW of Tracy, CaliforniaTue, Sep 10, 4:09 AM PDT · 14996 days ago · 0 km deep · 64 km away
29. 2.67 km WNW of Broadmoor, CaliforniaTue, Sep 10, 3:07 PM PDT · 14996 days ago · 8 km deep · 54 km away
30. 1.82 km WSW of Taft Mosswood, CaliforniaWed, Sep 11, 1:07 PM PDT · 14995 days ago · 15 km deep · 62 km away
31. 2.13 km W of Glen Ellen, CaliforniaThu, Sep 12, 10:23 AM PDT · 14994 days ago · 8 km deep · 66 km away
32. 1.93 km WSW of Glen Ellen, CaliforniaThu, Sep 12, 10:24 AM PDT · 14994 days ago · 8 km deep · 65 km away
33. 1.7Northern CaliforniaThu, Sep 12, 1:46 PM PDT · 14994 days ago · 7 km deep · 52 km away
34. 2.16 km NE of Windsor, CaliforniaThu, Sep 12, 3:04 PM PDT · 14994 days ago · 5 km deep · 96 km away
35. 1.9Northern CaliforniaThu, Sep 12, 6:13 PM PDT · 14994 days ago · 4 km deep · 57 km away
36. 2.213 km N of Morgan Hill, CaliforniaThu, Sep 12, 10:05 PM PDT · 14993 days ago · 5 km deep · 85 km away
37. 1.910 km NNW of Moskowite Corner, CaliforniaMon, Sep 16, 3:50 PM PDT · 14990 days ago · 9 km deep · 67 km away
38. 1.69 km NNE of Morgan Hill, CaliforniaThu, Sep 19, 8:21 PM PDT · 14987 days ago · 4 km deep · 91 km away
39. 1.9Northern CaliforniaSat, Sep 21, 8:36 AM PDT · 14985 days ago · 3 km deep · 50 km away
40. 1.611 km SW of Brentwood, CaliforniaSat, Sep 21, 9:23 PM PDT · 14985 days ago · 11 km deep · 24 km away
41. 1.85 km NNE of Windsor, CaliforniaMon, Sep 23, 5:41 PM PDT · 14983 days ago · 5 km deep · 98 km away
42. 2.36 km NNE of Windsor, CaliforniaMon, Sep 23, 5:41 PM PDT · 14983 days ago · 1 km deep · 98 km away
43. 1.516 km NE of East Foothills, CaliforniaMon, Sep 23, 10:10 PM PDT · 14982 days ago · 8 km deep · 60 km away
44. 3.516 km NE of East Foothills, CaliforniaTue, Sep 24, 12:21 AM PDT · 14982 days ago · 9 km deep · 59 km away
45. 2.5Northern CaliforniaTue, Sep 24, 12:25 AM PDT · 14982 days ago · 8 km deep · 60 km away
46. 1.611 km SW of Brentwood, CaliforniaTue, Sep 24, 7:04 AM PDT · 14982 days ago · 15 km deep · 25 km away
47. 1.816 km NE of East Foothills, CaliforniaTue, Sep 24, 1:07 PM PDT · 14982 days ago · 8 km deep · 60 km away
48. 2.05 km S of Moskowite Corner, CaliforniaWed, Sep 25, 2:46 AM PDT · 14981 days ago · 8 km deep · 52 km away
49. 1.82 km E of North Gate, CaliforniaWed, Sep 25, 7:09 AM PDT · 14981 days ago · 12 km deep · 7 km away
50. 2.52 km E of Moskowite Corner, CaliforniaWed, Sep 25, 3:51 PM PDT · 14981 days ago · 4 km deep · 56 km away
51. 1.810 km ENE of Blackhawk, CaliforniaWed, Sep 25, 4:49 PM PDT · 14981 days ago · 11 km deep · 24 km away
52. 1.63 km NE of Santa Rosa, CaliforniaThu, Sep 26, 5:49 PM PDT · 14980 days ago · 2 km deep · 81 km away
53. 1.64 km ESE of Moskowite Corner, CaliforniaFri, Sep 27, 5:43 PM PDT · 14979 days ago · 5 km deep · 53 km away
54. 1.62 km E of Rodeo, CaliforniaFri, Sep 27, 11:17 PM PDT · 14978 days ago · 4 km deep · 21 km away
55. 1.916 km E of Seven Trees, CaliforniaSat, Sep 28, 1:02 AM PDT · 14978 days ago · 6 km deep · 82 km away
56. 1.616 km E of Seven Trees, CaliforniaSat, Sep 28, 1:56 AM PDT · 14978 days ago · 5 km deep · 82 km away
57. 2.84 km NE of San Leandro, CaliforniaSun, Sep 29, 1:21 AM PDT · 14977 days ago · 11 km deep · 24 km away
58. 1.76 km NE of East Foothills, CaliforniaSun, Sep 29, 4:11 AM PDT · 14977 days ago · 9 km deep · 63 km away
59. 1.615 km N of Morgan Hill, CaliforniaMon, Sep 30, 4:52 AM PDT · 14976 days ago · 8 km deep · 83 km away
60. 2.813 km N of Morgan Hill, CaliforniaMon, Sep 30, 9:45 PM PDT · 14976 days ago · 4 km deep · 85 km away

The first 60 of 90.

Before

1. 1.93 km ENE of San Leandro, CaliforniaFri, Aug 30, 3:53 PM PDT · 15007 days ago · 6 km deep · 25 km away
2. 1.611 km ESE of East Foothills, CaliforniaThu, Aug 29, 10:58 PM PDT · 15007 days ago · 7 km deep · 74 km away
3. 1.911 km ESE of East Foothills, CaliforniaThu, Aug 29, 10:57 PM PDT · 15007 days ago · 7 km deep · 75 km away
4. 2.515 km E of Seven Trees, CaliforniaThu, Aug 29, 10:26 PM PDT · 15007 days ago · 6 km deep · 80 km away
5. 2.29 km E of Sunol, CaliforniaThu, Aug 29, 9:36 AM PDT · 15008 days ago · 15 km deep · 45 km away
6. 1.913 km NNW of Moskowite Corner, CaliforniaThu, Aug 29, 6:21 AM PDT · 15008 days ago · 2 km deep · 70 km away
7. 1.58 km NNW of Moskowite Corner, CaliforniaThu, Aug 29, 3:03 AM PDT · 15008 days ago · 6 km deep · 65 km away
8. 1.614 km NNW of Moskowite Corner, CaliforniaThu, Aug 29, 12:55 AM PDT · 15008 days ago · 3 km deep · 70 km away
9. 1.614 km E of Seven Trees, CaliforniaWed, Aug 28, 1:35 PM PDT · 15009 days ago · 3 km deep · 80 km away
10. 2.015 km NNW of Moskowite Corner, CaliforniaWed, Aug 28, 11:00 AM PDT · 15009 days ago · 15 km deep · 72 km away
11. 2.312 km ESE of East Foothills, CaliforniaWed, Aug 28, 10:50 AM PDT · 15009 days ago · 8 km deep · 76 km away
12. 2.212 km ESE of East Foothills, CaliforniaWed, Aug 28, 9:32 AM PDT · 15009 days ago · 6 km deep · 76 km away
13. 2.513 km NW of Moskowite Corner, CaliforniaWed, Aug 28, 9:01 AM PDT · 15009 days ago · 0 km deep · 69 km away
14. 2.013 km NW of Moskowite Corner, CaliforniaWed, Aug 28, 8:25 AM PDT · 15009 days ago · 0 km deep · 70 km away
15. 1.98 km NW of Broadmoor, CaliforniaTue, Aug 27, 12:07 PM PDT · 15010 days ago · 6 km deep · 52 km away
16. 2.113 km NNW of Moskowite Corner, CaliforniaTue, Aug 27, 9:47 AM PDT · 15010 days ago · 0 km deep · 70 km away
17. 2.19 km NNW of Kenwood, CaliforniaMon, Aug 26, 4:41 AM PDT · 15011 days ago · 6 km deep · 78 km away
18. 1.64 km SSE of North Gate, CaliforniaMon, Aug 26, 4:09 AM PDT · 15011 days ago · 7 km deep · 10 km away
19. 2.414 km E of Seven Trees, CaliforniaSat, Aug 24, 6:09 AM PDT · 15013 days ago · 3 km deep · 79 km away
20. 1.611 km ESE of East Foothills, CaliforniaSat, Aug 24, 5:47 AM PDT · 15013 days ago · 7 km deep · 74 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc54445. Read Thu, Oct 1, 2026, 4:26 PM UTC.