M2.3 earthquake 10 km E of Blackhawk, California

Magnitude

2.3 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, May 30, 1990, 4:51 PM PDT

UTC

1990-05-30 23:51:41 UTC

Depth

13.9 km (8.7 mi), shallow

Epicenter

37.837° N, 121.795° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.4 km in depth

Magnitude uncertainty

±0.17

Depth from

From location

Station coverage gap

99°

Stations used

42

• Blackhawk, CaliforniaPopulation 9,354. Forecast10 kmE
• Brentwood, CaliforniaPopulation 58,968. Forecast14 kmSW
• Antioch, CaliforniaPopulation 110,542. Forecast19 kmS
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast528 kmNW

After

1. 2.53 km NNW of Diablo, CaliforniaThu, May 31, 9:46 AM PDT · 13275 days ago · 0 km deep · 16 km away
2. 1.83 km NNW of Diablo, CaliforniaThu, May 31, 9:51 AM PDT · 13275 days ago · 0 km deep · 16 km away
3. 1.93 km NNW of Diablo, CaliforniaThu, May 31, 10:05 AM PDT · 13275 days ago · 0 km deep · 16 km away
4. 1.62 km SW of Brentwood, CaliforniaSat, Jun 2, 12:46 PM PDT · 13273 days ago · 17 km deep · 11 km away
5. 2.13 km ENE of Alamo, CaliforniaSat, Jun 2, 4:08 PM PDT · 13273 days ago · 6 km deep · 18 km away
6. 2.33 km ENE of Alamo, CaliforniaSat, Jun 2, 10:53 PM PDT · 13273 days ago · 5 km deep · 18 km away
7. 2.32 km ENE of Alamo, CaliforniaSat, Jun 2, 10:58 PM PDT · 13273 days ago · 5 km deep · 18 km away
8. 1.917 km NE of East Foothills, CaliforniaSat, Jun 2, 11:51 PM PDT · 13273 days ago · 7 km deep · 38 km away
9. 1.71 km ENE of Alamo, CaliforniaMon, Jun 4, 7:20 AM PDT · 13271 days ago · 6 km deep · 20 km away
10. 1.61 km ENE of Alamo, CaliforniaMon, Jun 4, 7:30 AM PDT · 13271 days ago · 6 km deep · 20 km away
11. 1.76 km ENE of Corralitos, CaliforniaTue, Jun 5, 5:20 AM PDT · 13271 days ago · 9 km deep · 91 km away
12. 1.63 km ENE of Alamo, CaliforniaTue, Jun 5, 3:45 PM PDT · 13270 days ago · 5 km deep · 17 km away
13. 2.53 km NNE of San Leandro, CaliforniaThu, Jun 7, 3:30 PM PDT · 13268 days ago · 7 km deep · 31 km away
14. 1.83 km NW of Diablo, CaliforniaFri, Jun 8, 12:38 AM PDT · 13268 days ago · 1 km deep · 17 km away
15. 1.91 km ENE of Alamo, CaliforniaSat, Jun 9, 10:02 AM PDT · 13266 days ago · 6 km deep · 20 km away
16. 3.315 km E of Seven Trees, CaliforniaSun, Jun 10, 6:38 PM PDT · 13265 days ago · 6 km deep · 62 km away
17. 1.63 km ENE of Corralitos, CaliforniaSun, Jun 10, 8:34 PM PDT · 13265 days ago · 14 km deep · 93 km away
18. 1.51 km NNE of Interlaken, CaliforniaSun, Jun 10, 8:55 PM PDT · 13265 days ago · 13 km deep · 97 km away
19. 3.55 km SW of Yountville, CaliforniaMon, Jun 11, 2:07 AM PDT · 13265 days ago · 10 km deep · 80 km away
20. 1.512 km NNE of Morgan Hill, CaliforniaMon, Jun 11, 4:43 PM PDT · 13264 days ago · 4 km deep · 68 km away
21. 2.04 km WNW of Day Valley, CaliforniaTue, Jun 12, 8:05 AM PDT · 13263 days ago · 17 km deep · 87 km away
22. 1.97 km N of Day Valley, CaliforniaTue, Jun 12, 1:38 PM PDT · 13263 days ago · 5 km deep · 82 km away
23. 1.710 km WSW of Morgan Hill, CaliforniaWed, Jun 13, 3:29 PM PDT · 13262 days ago · 2 km deep · 81 km away
24. 1.93 km SW of Moskowite Corner, CaliforniaThu, Jun 14, 4:41 AM PDT · 13262 days ago · 8 km deep · 75 km away
25. 1.63 km E of Saratoga, CaliforniaThu, Jun 14, 5:00 AM PDT · 13262 days ago · 7 km deep · 66 km away
26. 1.91 km SW of Saratoga, CaliforniaFri, Jun 15, 4:21 AM PDT · 13261 days ago · 6 km deep · 68 km away
27. 1.62 km ENE of Alamo, CaliforniaSat, Jun 16, 3:09 AM PDT · 13260 days ago · 7 km deep · 19 km away
28. 1.913 km NNW of Moskowite Corner, CaliforniaSun, Jun 17, 4:15 PM PDT · 13258 days ago · 3 km deep · 89 km away
29. 2.13 km SSW of Los Altos Hills, CaliforniaMon, Jun 18, 12:15 AM PDT · 13258 days ago · 7 km deep · 63 km away
30. 1.88 km SE of Livermore, CaliforniaMon, Jun 18, 11:21 PM PDT · 13257 days ago · 6 km deep · 25 km away
31. 1.71 km NNE of Lexington Hills, CaliforniaTue, Jun 19, 4:30 AM PDT · 13257 days ago · 5 km deep · 75 km away
32. 2.33 km SSW of Saratoga, CaliforniaTue, Jun 19, 7:43 PM PDT · 13256 days ago · 10 km deep · 70 km away
33. 1.94 km E of Interlaken, CaliforniaTue, Jun 19, 11:39 PM PDT · 13256 days ago · 9 km deep · 99 km away
34. 1.89 km N of Boulder Creek, CaliforniaWed, Jun 20, 3:22 PM PDT · 13255 days ago · 12 km deep · 75 km away
35. 1.69 km N of Boulder Creek, CaliforniaWed, Jun 20, 3:30 PM PDT · 13255 days ago · 12 km deep · 75 km away
36. 1.7Northern CaliforniaWed, Jun 20, 9:33 PM PDT · 13255 days ago · 7 km deep · 87 km away
37. 2.32 km N of Kensington, CaliforniaSat, Jun 23, 12:46 AM PDT · 13253 days ago · 9 km deep · 44 km away
38. 1.55 km NW of Day Valley, CaliforniaSat, Jun 23, 2:54 AM PDT · 13253 days ago · 16 km deep · 87 km away
39. 2.24 km SE of North Gate, CaliforniaSat, Jun 23, 7:35 AM PDT · 13252 days ago · 4 km deep · 16 km away
40. 1.813 km NE of East Foothills, CaliforniaSat, Jun 23, 11:01 PM PDT · 13252 days ago · 8 km deep · 43 km away
41. 1.92 km S of Lexington Hills, CaliforniaSun, Jun 24, 6:53 PM PDT · 13251 days ago · 11 km deep · 79 km away
42. 1.83 km SE of Los Gatos, CaliforniaMon, Jun 25, 10:20 PM PDT · 13250 days ago · 2 km deep · 72 km away
43. 1.94 km S of Lexington Hills, CaliforniaWed, Jun 27, 2:08 AM PDT · 13249 days ago · 13 km deep · 81 km away
44. 1.73 km E of Sonoma, CaliforniaWed, Jun 27, 4:33 PM PDT · 13248 days ago · 4 km deep · 74 km away
45. 2.86 km E of Zayante, CaliforniaThu, Jun 28, 9:33 AM PDT · 13247 days ago · 6 km deep · 83 km away
46. 2.64 km NW of Day Valley, CaliforniaFri, Jun 29, 6:20 PM PDT · 13246 days ago · 13 km deep · 85 km away
47. 1.61 km SW of Aptos Hills-Larkin Valley, CaliforniaSat, Jun 30, 6:18 AM PDT · 13245 days ago · 5 km deep · 98 km away
48. 1.86 km WSW of Gilroy, CaliforniaSat, Jun 30, 6:57 AM PDT · 13245 days ago · 5 km deep · 96 km away
49. 2.06 km N of Castro Valley, CaliforniaSat, Jun 30, 11:18 AM PDT · 13245 days ago · 5 km deep · 27 km away
50. 4.16 km NE of East Foothills, CaliforniaSat, Jun 30, 5:36 PM PDT · 13245 days ago · 8 km deep · 47 km away
51. 1.53 km ENE of Alamo, CaliforniaSat, Jun 30, 9:44 PM PDT · 13245 days ago · 1 km deep · 18 km away
52. 2.34 km NNW of Diablo, CaliforniaSun, Jul 1, 9:48 AM PDT · 13244 days ago · 0 km deep · 16 km away
53. 2.96 km W of Allendale, CaliforniaMon, Jul 2, 3:20 PM PDT · 13243 days ago · 2 km deep · 71 km away
54. 1.61 km NE of Alamo, CaliforniaMon, Jul 2, 3:48 PM PDT · 13243 days ago · 4 km deep · 20 km away
55. 1.63 km W of Lexington Hills, CaliforniaTue, Jul 3, 1:35 PM PDT · 13242 days ago · 13 km deep · 77 km away
56. 1.610 km WSW of Taft Mosswood, CaliforniaWed, Jul 4, 9:38 PM PDT · 13241 days ago · 16 km deep · 36 km away
57. 1.814 km E of Seven Trees, CaliforniaThu, Jul 5, 1:04 PM PDT · 13240 days ago · 3 km deep · 62 km away
58. 2.06 km NE of East Foothills, CaliforniaThu, Jul 5, 11:55 PM PDT · 13240 days ago · 8 km deep · 45 km away
59. 1.614 km E of Seven Trees, CaliforniaSat, Jul 7, 9:09 PM PDT · 13238 days ago · 6 km deep · 61 km away
60. 1.61 km WNW of Corralitos, CaliforniaSun, Jul 8, 3:26 AM PDT · 13238 days ago · 12 km deep · 94 km away

The first 60 of 94.

Before

1. 2.44 km NNW of Diablo, CaliforniaWed, May 30, 11:37 AM PDT · 13276 days ago · 3 km deep · 17 km away
2. 2.89 km ESE of Livermore, CaliforniaTue, May 29, 8:56 PM PDT · 13277 days ago · 9 km deep · 25 km away
3. 2.22 km NNW of Seacliff, CaliforniaTue, May 29, 6:43 AM PDT · 13277 days ago · 5 km deep · 94 km away
4. 1.612 km WSW of Byron, CaliforniaTue, May 29, 4:06 AM PDT · 13278 days ago · 12 km deep · 5 km away
5. 1.82 km S of Lexington Hills, CaliforniaMon, May 28, 11:14 PM PDT · 13278 days ago · 13 km deep · 79 km away
6. 2.44 km S of Lexington Hills, CaliforniaMon, May 28, 7:43 PM PDT · 13278 days ago · 14 km deep · 80 km away
7. 2.14 km WNW of Lexington Hills, CaliforniaMon, May 28, 11:39 AM PDT · 13278 days ago · 11 km deep · 76 km away
8. 1.62 km N of Interlaken, CaliforniaMon, May 28, 11:15 AM PDT · 13278 days ago · 12 km deep · 96 km away
9. 2.02 km E of Alamo, CaliforniaSun, May 27, 11:12 PM PDT · 13279 days ago · 4 km deep · 18 km away
10. 2.213 km WNW of Davenport, CaliforniaSun, May 27, 10:52 PM PDT · 13279 days ago · 3 km deep · 97 km away
11. 2.70 km W of Diablo, CaliforniaSun, May 27, 8:51 PM PDT · 13279 days ago · 15 km deep · 15 km away
12. 1.72 km NNE of Danville, CaliforniaSun, May 27, 8:09 PM PDT · 13279 days ago · 5 km deep · 17 km away
13. 1.62 km E of Alamo, CaliforniaSun, May 27, 7:56 PM PDT · 13279 days ago · 3 km deep · 19 km away
14. 2.21 km SSE of Danville, CaliforniaSun, May 27, 4:17 AM PDT · 13280 days ago · 9 km deep · 18 km away
15. 1.64 km S of Lexington Hills, CaliforniaSun, May 27, 3:26 AM PDT · 13280 days ago · 13 km deep · 80 km away
16. 1.90 km W of Crockett, CaliforniaSat, May 26, 1:07 PM PDT · 13280 days ago · 10 km deep · 45 km away
17. 1.74 km ESE of Alameda, CaliforniaSat, May 26, 9:37 AM PDT · 13280 days ago · 5 km deep · 37 km away
18. 1.83 km ENE of Alamo, CaliforniaSat, May 26, 7:18 AM PDT · 13280 days ago · 4 km deep · 18 km away
19. 2.37 km S of Sunol, CaliforniaFri, May 25, 2:07 AM PDT · 13282 days ago · 10 km deep · 36 km away
20. 1.61 km NNW of Pleasanton, CaliforniaWed, May 23, 7:08 PM PDT · 13283 days ago · 10 km deep · 20 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc158579. Read Mon, Oct 5, 2026, 12:00 AM UTC.