M1.9 earthquake 10 km SE of Parkfield, California

Magnitude

1.9 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Thu, Mar 31, 1977, 11:02 PM PST

UTC

1977-04-01 07:02:54 UTC

Depth

6.3 km (3.9 mi), shallow

Epicenter

35.822° N, 120.367° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.7 km horizontally, 0.5 km in depth

Magnitude uncertainty

±0.11

Depth from

From location

Station coverage gap

216°, poorly surrounded by stations

Stations used

13

• Shandon, CaliforniaPopulation 1,295. Forecast19 kmN
• Avenal, CaliforniaPopulation 13,301. Forecast29 kmSW
• Santa Maria, CaliforniaPopulation 105,093. Forecast97 kmN
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast276 kmNW

After

1. 2.614 km NNW of San Simeon, CaliforniaFri, Apr 1, 7:46 AM PST · 18081 days ago · 7 km deep · 83 km away
2. 1.914 km SE of Parkfield, CaliforniaFri, Apr 1, 4:22 PM PST · 18081 days ago · 8 km deep · 4 km away
3. 1.823 km NW of Parkfield, CaliforniaFri, Apr 1, 8:45 PM PST · 18080 days ago · 6 km deep · 34 km away
4. 2.523 km NW of Parkfield, CaliforniaSat, Apr 2, 1:05 AM PST · 18080 days ago · 6 km deep · 34 km away
5. 2.622 km ENE of San Ardo, CaliforniaSat, Apr 2, 2:52 AM PST · 18080 days ago · 3 km deep · 42 km away
6. 3.117 km NW of San Simeon, CaliforniaSat, Apr 2, 10:51 AM PST · 18080 days ago · 9 km deep · 86 km away
7. 3.123 km ENE of Soledad, CaliforniaSun, Apr 3, 1:29 AM PST · 18079 days ago · 3 km deep · 99 km away
8. 2.024 km ENE of Soledad, CaliforniaSun, Apr 3, 9:18 AM PST · 18079 days ago · 6 km deep · 97 km away
9. 2.824 km NE of Greenfield, CaliforniaSun, Apr 3, 12:44 PM PST · 18079 days ago · 4 km deep · 95 km away
10. 1.623 km NE of Greenfield, CaliforniaMon, Apr 4, 9:40 AM PST · 18078 days ago · 8 km deep · 92 km away
11. 1.811 km NW of Parkfield, CaliforniaMon, Apr 4, 10:34 AM PST · 18078 days ago · 7 km deep · 22 km away
12. 2.524 km ENE of Greenfield, CaliforniaMon, Apr 4, 11:04 AM PST · 18078 days ago · 6 km deep · 87 km away
13. 2.324 km ENE of Greenfield, CaliforniaMon, Apr 4, 11:06 AM PST · 18078 days ago · 6 km deep · 87 km away
14. 2.04 km NNW of Avenal, CaliforniaMon, Apr 4, 10:34 PM PST · 18077 days ago · 9 km deep · 32 km away
15. 2.523 km NE of San Ardo, CaliforniaThu, Apr 7, 6:18 PM PST · 18075 days ago · 8 km deep · 54 km away
16. 1.923 km NE of Greenfield, CaliforniaSat, Apr 9, 1:12 PM PST · 18073 days ago · 5 km deep · 95 km away
17. 2.325 km ENE of San Ardo, CaliforniaFri, Apr 15, 1:31 AM PST · 18067 days ago · 1 km deep · 37 km away
18. 1.924 km NE of Greenfield, CaliforniaFri, Apr 15, 5:19 AM PST · 18067 days ago · 7 km deep · 92 km away
19. 1.725 km NE of Greenfield, CaliforniaMon, Apr 18, 3:12 AM PST · 18064 days ago · 7 km deep · 92 km away
20. 2.123 km NE of San Ardo, CaliforniaMon, Apr 18, 4:03 AM PST · 18064 days ago · 7 km deep · 55 km away
21. 1.823 km ENE of Soledad, CaliforniaTue, Apr 19, 2:50 AM PST · 18063 days ago · 4 km deep · 99 km away
22. 2.023 km ENE of Soledad, CaliforniaTue, Apr 19, 7:30 PM PST · 18063 days ago · 4 km deep · 98 km away
23. 2.224 km NE of King City, CaliforniaWed, Apr 20, 7:16 PM PST · 18062 days ago · 1 km deep · 78 km away
24. 3.119 km WNW of San Simeon, CaliforniaThu, Apr 21, 3:29 PM PST · 18061 days ago · 8 km deep · 93 km away
25. 1.82 km E of San Ardo, CaliforniaSun, Apr 24, 6:19 PM PDT · 18058 days ago · 15 km deep · 51 km away
26. 2.226 km W of Three Rocks, CaliforniaMon, Apr 25, 5:56 PM PDT · 18057 days ago · 11 km deep · 77 km away
27. 2.125 km NNE of King City, CaliforniaTue, Apr 26, 9:02 PM PDT · 18056 days ago · 2 km deep · 85 km away
28. 1.722 km NE of San Lucas, CaliforniaWed, Apr 27, 1:48 PM PDT · 18055 days ago · 5 km deep · 70 km away
29. 2.524 km NE of Greenfield, CaliforniaFri, Apr 29, 11:11 PM PDT · 18052 days ago · 7 km deep · 95 km away
30. 1.723 km ENE of Soledad, CaliforniaSat, Apr 30, 10:20 AM PDT · 18052 days ago · 6 km deep · 98 km away
31. 2.924 km ENE of Soledad, CaliforniaSat, Apr 30, 6:32 PM PDT · 18052 days ago · 3 km deep · 98 km away
32. 1.723 km ENE of Soledad, CaliforniaSat, Apr 30, 9:37 PM PDT · 18051 days ago · 3 km deep · 98 km away
33. 1.621 km NW of Parkfield, CaliforniaMon, May 2, 10:06 AM PDT · 18050 days ago · 4 km deep · 32 km away
34. 1.817 km NW of Parkfield, CaliforniaMon, May 2, 3:42 PM PDT · 18050 days ago · 2 km deep · 28 km away
35. 2.525 km NE of Greenfield, CaliforniaTue, May 3, 10:57 PM PDT · 18048 days ago · 4 km deep · 95 km away
36. 3.216 km W of Three Rocks, CaliforniaTue, May 3, 11:04 PM PDT · 18048 days ago · 15 km deep · 79 km away
37. 2.324 km NE of Greenfield, CaliforniaWed, May 4, 3:30 AM PDT · 18048 days ago · 1 km deep · 95 km away
38. 1.710 km SSW of San Lucas, CaliforniaFri, May 6, 10:48 PM PDT · 18045 days ago · 13 km deep · 68 km away
39. 2.136 km W of Three Rocks, CaliforniaTue, May 10, 7:53 PM PDT · 18042 days ago · 3 km deep · 89 km away
40. 2.225 km WSW of Lockwood, CaliforniaSun, May 15, 1:02 PM PDT · 18037 days ago · 8 km deep · 89 km away
41. 1.71 km ESE of San Ardo, CaliforniaSun, May 15, 6:59 PM PDT · 18037 days ago · 11 km deep · 52 km away
42. 2.323 km NE of Greenfield, CaliforniaTue, May 17, 8:20 AM PDT · 18035 days ago · 7 km deep · 94 km away
43. 1.624 km NE of Greenfield, CaliforniaWed, May 18, 2:49 AM PDT · 18034 days ago · 7 km deep · 93 km away
44. 2.030 km NE of San Lucas, CaliforniaFri, May 20, 9:27 PM PDT · 18032 days ago · 11 km deep · 64 km away
45. 2.714km SW of Avila Beach, CASat, May 21, 8:49 AM PDT · 18031 days ago · 6 km deep · 92 km away
46. 1.610 km N of Lockwood, CaliforniaSun, May 22, 10:09 PM PDT · 18029 days ago · 11 km deep · 67 km away
47. 2.023 km NE of San Ardo, CaliforniaWed, May 25, 8:15 PM PDT · 18027 days ago · 7 km deep · 54 km away
48. 1.521 km ENE of San Lucas, CaliforniaSat, May 28, 12:24 AM PDT · 18024 days ago · 8 km deep · 61 km away
49. 2.124 km NE of Greenfield, CaliforniaSun, May 29, 9:47 PM PDT · 18022 days ago · 7 km deep · 95 km away

Before

1. 1.623 km NE of Greenfield, CaliforniaThu, Mar 31, 4:58 AM PST · 18082 days ago · 5 km deep · 93 km away
2. 2.018 km WNW of Coalinga, CaliforniaThu, Mar 31, 3:32 AM PST · 18082 days ago · 5 km deep · 45 km away
3. 1.924 km ENE of Greenfield, CaliforniaWed, Mar 30, 7:34 PM PST · 18083 days ago · 4 km deep · 86 km away
4. 1.516 km NW of Parkfield, CaliforniaWed, Mar 30, 11:20 AM PST · 18083 days ago · 1 km deep · 27 km away
5. 2.524 km NE of Greenfield, CaliforniaWed, Mar 30, 7:00 AM PST · 18083 days ago · 2 km deep · 96 km away
6. 1.524 km ENE of Greenfield, CaliforniaTue, Mar 29, 1:32 PM PST · 18084 days ago · 1 km deep · 90 km away
7. 2.323 km NE of King City, CaliforniaMon, Mar 28, 9:16 PM PST · 18084 days ago · 3 km deep · 80 km away
8. 2.326 km ENE of Greenfield, CaliforniaMon, Mar 28, 5:50 PM PST · 18085 days ago · 9 km deep · 87 km away
9. 3.37 km W of Three Rocks, CaliforniaMon, Mar 28, 4:06 PM PST · 18085 days ago · 6 km deep · 77 km away
10. 3.125 km WNW of Three Rocks, CaliforniaSun, Mar 27, 3:39 PM PST · 18086 days ago · 3 km deep · 86 km away
11. 2.822 km NE of San Lucas, CaliforniaSun, Mar 27, 3:32 AM PST · 18086 days ago · 9 km deep · 63 km away
12. 2.423 km ENE of Soledad, CaliforniaFri, Mar 25, 8:37 PM PST · 18087 days ago · 3 km deep · 100 km away
13. 2.123 km NNE of San Lucas, CaliforniaFri, Mar 25, 5:19 AM PST · 18088 days ago · 4 km deep · 71 km away
14. 1.516 km NW of Parkfield, CaliforniaThu, Mar 24, 2:22 AM PST · 18089 days ago · 4 km deep · 27 km away
15. 3.1Central CaliforniaWed, Mar 23, 10:03 PM PST · 18089 days ago · 5 km deep · 71 km away
16. 1.623 km NE of Greenfield, CaliforniaWed, Mar 23, 4:57 AM PST · 18090 days ago · 5 km deep · 94 km away
17. 1.923 km NE of Greenfield, CaliforniaWed, Mar 23, 4:34 AM PST · 18090 days ago · 5 km deep · 95 km away
18. 1.624 km NE of Greenfield, CaliforniaWed, Mar 23, 2:47 AM PST · 18090 days ago · 5 km deep · 94 km away
19. 2.424 km NE of Greenfield, CaliforniaTue, Mar 22, 11:12 PM PST · 18090 days ago · 5 km deep · 94 km away
20. 2.525 km ENE of Greenfield, CaliforniaMon, Mar 21, 5:41 PM PST · 18092 days ago · 5 km deep · 86 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1034621. Read Fri, Oct 2, 2026, 4:06 PM UTC.