M1.7 earthquake 2 km W of Ridgemark, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Apr 4, 1990, 3:51 PM PDT

UTC

1990-04-04 22:51:09 UTC

Depth

6.6 km (4.1 mi), shallow

Epicenter

36.809° N, 121.394° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.15

Depth from

From location

Station coverage gap

38°

Stations used

37

• Ridgemark, CaliforniaPopulation 3,016. Forecast3 kmW
• Hollister, CaliforniaPopulation 37,462. Forecast5 kmS
• Salinas, CaliforniaPopulation 157,380. Forecast27 kmENE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast419 kmNW

After

1. 1.93 km SW of Lexington Hills, CaliforniaWed, Apr 4, 8:22 PM PDT · 13330 days ago · 13 km deep · 65 km away
2. 1.72 km NNW of Seacliff, CaliforniaWed, Apr 4, 9:04 PM PDT · 13330 days ago · 4 km deep · 52 km away
3. 2.44 km ESE of Interlaken, CaliforniaThu, Apr 5, 12:31 AM PDT · 13330 days ago · 11 km deep · 30 km away
4. 1.62 km SW of Lexington Hills, CaliforniaThu, Apr 5, 1:41 AM PDT · 13330 days ago · 14 km deep · 65 km away
5. 1.63 km ENE of Tres Pinos, CaliforniaThu, Apr 5, 9:46 AM PDT · 13330 days ago · 9 km deep · 10 km away
6. 1.51 km WSW of Freedom, CaliforniaThu, Apr 5, 6:11 PM PDT · 13329 days ago · 6 km deep · 37 km away
7. 2.83 km W of San Juan Bautista, CaliforniaFri, Apr 6, 5:05 PM PDT · 13328 days ago · 7 km deep · 17 km away
8. 1.95 km NNE of Tres Pinos, CaliforniaSat, Apr 7, 12:17 AM PDT · 13328 days ago · 4 km deep · 9 km away
9. 1.87 km N of Day Valley, CaliforniaSat, Apr 7, 1:30 AM PDT · 13328 days ago · 5 km deep · 54 km away
10. 1.816 km NW of Diablo Grande, CaliforniaSat, Apr 7, 2:21 AM PDT · 13328 days ago · 6 km deep · 76 km away
11. 1.511 km S of Tres Pinos, CaliforniaSat, Apr 7, 3:02 AM PDT · 13328 days ago · 8 km deep · 16 km away
12. 4.01 km NNE of Aromas, CaliforniaSat, Apr 7, 1:08 PM PDT · 13328 days ago · 6 km deep · 24 km away
13. 1.62 km NNE of Aromas, CaliforniaSat, Apr 7, 2:45 PM PDT · 13328 days ago · 5 km deep · 24 km away
14. 2.81 km ENE of Aromas, CaliforniaSat, Apr 7, 2:49 PM PDT · 13328 days ago · 5 km deep · 23 km away
15. 1.98 km SSE of San Juan Bautista, CaliforniaSat, Apr 7, 8:45 PM PDT · 13327 days ago · 10 km deep · 11 km away
16. 1.920 km S of Big Sur, CaliforniaSun, Apr 8, 4:46 PM PDT · 13326 days ago · 17 km deep · 90 km away
17. 1.816 km S of Davenport, CaliforniaSun, Apr 8, 7:30 PM PDT · 13326 days ago · 2 km deep · 69 km away
18. 1.921 km NE of Soledad, CaliforniaMon, Apr 9, 12:07 AM PDT · 13326 days ago · 6 km deep · 31 km away
19. 2.93 km NNW of Seacliff, CaliforniaMon, Apr 9, 1:09 AM PDT · 13326 days ago · 5 km deep · 52 km away
20. 2.25 km WSW of Davenport, CaliforniaMon, Apr 9, 2:39 AM PDT · 13326 days ago · 9 km deep · 79 km away
21. 2.75 km NNW of Aromas, CaliforniaMon, Apr 9, 3:48 AM PDT · 13326 days ago · 7 km deep · 28 km away
22. 1.95 km NNW of Aromas, CaliforniaMon, Apr 9, 4:52 AM PDT · 13326 days ago · 7 km deep · 28 km away
23. 2.15 km NNW of Aromas, CaliforniaMon, Apr 9, 5:33 AM PDT · 13326 days ago · 7 km deep · 28 km away
24. 2.35 km NNW of Aromas, CaliforniaMon, Apr 9, 5:35 AM PDT · 13326 days ago · 7 km deep · 28 km away
25. 2.313 km SSE of Tres Pinos, CaliforniaMon, Apr 9, 11:35 AM PDT · 13326 days ago · 2 km deep · 18 km away
26. 3.03 km N of Aromas, CaliforniaMon, Apr 9, 12:46 PM PDT · 13326 days ago · 6 km deep · 26 km away
27. 2.03 km SW of Hollister, CaliforniaMon, Apr 9, 2:34 PM PDT · 13326 days ago · 7 km deep · 4 km away
28. 2.05 km SW of Monte Sereno, CaliforniaMon, Apr 9, 6:41 PM PDT · 13325 days ago · 14 km deep · 72 km away
29. 1.82 km ESE of Aromas, CaliforniaMon, Apr 9, 7:18 PM PDT · 13325 days ago · 6 km deep · 21 km away
30. 2.52 km ESE of Aromas, CaliforniaMon, Apr 9, 8:18 PM PDT · 13325 days ago · 7 km deep · 21 km away
31. 3.62 km ESE of Aromas, CaliforniaMon, Apr 9, 8:28 PM PDT · 13325 days ago · 7 km deep · 21 km away
32. 2.23 km ESE of Aromas, CaliforniaMon, Apr 9, 8:54 PM PDT · 13325 days ago · 7 km deep · 20 km away
33. 2.43 km ESE of Aromas, CaliforniaMon, Apr 9, 10:04 PM PDT · 13325 days ago · 7 km deep · 20 km away
34. 1.84 km NW of Day Valley, CaliforniaTue, Apr 10, 1:03 AM PDT · 13325 days ago · 16 km deep · 53 km away
35. 2.71 km ENE of Interlaken, CATue, Apr 10, 1:51 AM PDT · 13325 days ago · 13 km deep · 33 km away
36. 1.9Central CaliforniaTue, Apr 10, 4:27 AM PDT · 13325 days ago · 6 km deep · 39 km away
37. 2.32 km ESE of Aromas, CaliforniaTue, Apr 10, 7:14 AM PDT · 13325 days ago · 7 km deep · 21 km away
38. 3.02 km ESE of Aromas, CaliforniaTue, Apr 10, 10:44 AM PDT · 13325 days ago · 7 km deep · 21 km away
39. 2.12 km ESE of Aromas, CaliforniaTue, Apr 10, 11:59 AM PDT · 13325 days ago · 7 km deep · 21 km away
40. 1.83 km SW of Hollister, CaliforniaTue, Apr 10, 12:22 PM PDT · 13325 days ago · 6 km deep · 3 km away
41. 1.85 km WNW of Volta, CaliforniaWed, Apr 11, 10:28 AM PDT · 13324 days ago · 7 km deep · 50 km away
42. 1.522 km NE of San Ardo, CaliforniaWed, Apr 11, 12:10 PM PDT · 13324 days ago · 4 km deep · 92 km away
43. 2.014 km SSE of Tres Pinos, CaliforniaWed, Apr 11, 12:49 PM PDT · 13324 days ago · 4 km deep · 19 km away
44. 2.812 km N of Morgan Hill, CaliforniaWed, Apr 11, 7:06 PM PDT · 13323 days ago · 5 km deep · 52 km away
45. 3.04 km ESE of Interlaken, CaliforniaWed, Apr 11, 9:45 PM PDT · 13323 days ago · 12 km deep · 29 km away
46. 2.34 km ESE of Interlaken, CaliforniaWed, Apr 11, 9:48 PM PDT · 13323 days ago · 12 km deep · 29 km away
47. 1.95 km ESE of Interlaken, CAWed, Apr 11, 10:35 PM PDT · 13323 days ago · 12 km deep · 29 km away
48. 2.522 km ENE of Soledad, CaliforniaThu, Apr 12, 12:20 AM PDT · 13323 days ago · 5 km deep · 42 km away
49. 2.69 km ESE of East Foothills, CaliforniaThu, Apr 12, 7:22 AM PDT · 13323 days ago · 7 km deep · 67 km away
50. 1.615 km E of Seven Trees, CaliforniaThu, Apr 12, 7:21 PM PDT · 13322 days ago · 2 km deep · 58 km away
51. 1.83 km SW of Hollister, CaliforniaFri, Apr 13, 10:16 AM PDT · 13322 days ago · 7 km deep · 4 km away
52. 1.52 km SW of San Juan Bautista, CaliforniaFri, Apr 13, 4:13 PM PDT · 13321 days ago · 6 km deep · 15 km away
53. 1.73 km N of Interlaken, CaliforniaFri, Apr 13, 9:01 PM PDT · 13321 days ago · 12 km deep · 36 km away
54. 2.15 km ESE of Interlaken, CaliforniaFri, Apr 13, 11:42 PM PDT · 13321 days ago · 13 km deep · 29 km away
55. 1.78 km ENE of Morgan Hill, CaliforniaSat, Apr 14, 9:52 AM PDT · 13321 days ago · 2 km deep · 41 km away
56. 1.67 km S of Tres Pinos, CaliforniaSat, Apr 14, 3:47 PM PDT · 13320 days ago · 9 km deep · 12 km away
57. 1.88 km ENE of San Martin, CaliforniaSat, Apr 14, 5:31 PM PDT · 13320 days ago · 7 km deep · 37 km away
58. 2.124 km ENE of Greenfield, CaliforniaSat, Apr 14, 6:28 PM PDT · 13320 days ago · 5 km deep · 57 km away
59. 2.11 km NNW of Lexington Hills, CaliforniaSun, Apr 15, 1:09 PM PDT · 13320 days ago · 7 km deep · 67 km away
60. 1.77 km NE of Hollister, CaliforniaSun, Apr 15, 4:18 PM PDT · 13319 days ago · 7 km deep · 11 km away

The first 60 of 191.

Before

1. 1.622 km NE of Soledad, CaliforniaWed, Apr 4, 12:58 PM PDT · 13331 days ago · 9 km deep · 38 km away
2. 1.714 km N of Morgan Hill, CaliforniaTue, Apr 3, 11:27 PM PDT · 13331 days ago · 7 km deep · 55 km away
3. 2.02 km SW of San Juan Bautista, CaliforniaTue, Apr 3, 11:37 AM PDT · 13332 days ago · 8 km deep · 15 km away
4. 1.92 km SW of San Juan Bautista, CaliforniaTue, Apr 3, 11:34 AM PDT · 13332 days ago · 8 km deep · 15 km away
5. 2.324 km NE of Greenfield, CaliforniaTue, Apr 3, 4:45 AM PDT · 13332 days ago · 7 km deep · 48 km away
6. 2.85 km WNW of San Juan Bautista, CaliforniaTue, Apr 3, 3:01 AM PDT · 13332 days ago · 7 km deep · 19 km away
7. 2.021 km E of Tres Pinos, CaliforniaTue, Apr 3, 12:14 AM PDT · 13332 days ago · 4 km deep · 27 km away
8. 2.122 km WNW of Big Sur, CaliforniaMon, Apr 2, 4:38 PM PDT · 13332 days ago · 11 km deep · 75 km away
9. 1.66 km NE of Ridgemark, CaliforniaMon, Apr 2, 6:34 AM PDT · 13333 days ago · 10 km deep · 8 km away
10. 1.635 km W of Three Rocks, CaliforniaSun, Apr 1, 7:44 PM PDT · 13333 days ago · 4 km deep · 61 km away
11. 1.57 km ENE of Lockwood, CaliforniaSun, Apr 1, 5:02 PM PDT · 13333 days ago · 5 km deep · 98 km away
12. 1.73 km SW of Lexington Hills, CaliforniaSun, Apr 1, 1:40 PM PDT · 13334 days ago · 13 km deep · 65 km away
13. 2.52 km W of San Juan Bautista, CaliforniaSun, Apr 1, 10:05 AM PDT · 13334 days ago · 3 km deep · 16 km away
14. 2.614 km N of Morgan Hill, CaliforniaSun, Apr 1, 6:52 AM PDT · 13334 days ago · 6 km deep · 55 km away
15. 2.52 km SW of San Juan Bautista, CaliforniaSun, Apr 1, 4:38 AM PDT · 13334 days ago · 8 km deep · 15 km away
16. 1.824 km NE of Greenfield, CaliforniaSun, Apr 1, 12:51 AM PST · 13334 days ago · 5 km deep · 48 km away
17. 2.07 km NE of Lockwood, CaliforniaSat, Mar 31, 11:01 PM PST · 13334 days ago · 8 km deep · 98 km away
18. 2.15 km SSW of Tres Pinos, CaliforniaSat, Mar 31, 5:28 PM PST · 13334 days ago · 8 km deep · 7 km away
19. 1.86 km NE of Lockwood, CaliforniaSat, Mar 31, 10:08 AM PST · 13335 days ago · 8 km deep · 98 km away
20. 3.123 km NE of San Ardo, CaliforniaSat, Mar 31, 5:28 AM PST · 13335 days ago · 8 km deep · 92 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc155257. Read Sat, Oct 3, 2026, 9:43 AM UTC.