M1.7 earthquake 11 km NNE of Cayucos, California

Magnitude

1.7 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Sun, Jul 23, 1978, 8:37 PM PDT

UTC

1978-07-24 03:37:44 UTC

Depth

4.6 km (2.9 mi), shallow

Epicenter

35.537° N, 120.843° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 8.0 km in depth

Magnitude uncertainty

±0.08

Depth from

From location

Station coverage gap

188°, poorly surrounded by stations

Stations used

10

• Cayucos, CaliforniaPopulation 2,592. Forecast11 kmNNE
• Atascadero, CaliforniaPopulation 29,819. Forecast16 kmWNW
• Santa Maria, CaliforniaPopulation 105,093. Forecast75 kmNNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast289 kmNW

After

1. 1.719 km NW of Parkfield, CaliforniaFri, Jul 28, 2:15 AM PDT · 17601 days ago · 5 km deep · 59 km away
2. 2.217 km WSW of Lockwood, CaliforniaSat, Jul 29, 4:43 PM PDT · 17599 days ago · 12 km deep · 54 km away
3. 1.98 km WSW of San Miguel, CaliforniaTue, Aug 1, 5:48 AM PDT · 17597 days ago · 5 km deep · 23 km away
4. 2.818 km NW of Parkfield, CaliforniaWed, Aug 2, 7:59 AM PDT · 17596 days ago · 5 km deep · 59 km away
5. 1.621 km NW of Parkfield, CaliforniaThu, Aug 3, 11:51 PM PDT · 17594 days ago · 4 km deep · 60 km away
6. 1.821 km NW of Parkfield, CaliforniaSat, Aug 5, 2:26 AM PDT · 17593 days ago · 2 km deep · 60 km away
7. 1.64 km NE of Bradley, CaliforniaSat, Aug 5, 3:43 AM PDT · 17593 days ago · 10 km deep · 41 km away
8. 1.62 km SSE of Parkfield, CaliforniaMon, Aug 7, 12:22 PM PDT · 17590 days ago · 10 km deep · 53 km away
9. 1.821 km NW of Parkfield, CaliforniaFri, Aug 11, 5:23 PM PDT · 17586 days ago · 4 km deep · 60 km away
10. 1.523 km NNE of San Lucas, CaliforniaMon, Aug 14, 7:59 PM PDT · 17583 days ago · 4 km deep · 86 km away
11. 2.010 km SSW of Avenal, CaliforniaMon, Aug 14, 11:15 PM PDT · 17583 days ago · 14 km deep · 74 km away
12. 2.18 km SSW of Avenal, CaliforniaMon, Aug 14, 11:26 PM PDT · 17583 days ago · 14 km deep · 76 km away
13. 2.323 km NNE of San Lucas, CaliforniaWed, Aug 16, 10:43 PM PDT · 17581 days ago · 6 km deep · 85 km away
14. 2.237 km SE of Big Sur, CaliforniaFri, Aug 18, 8:14 PM PDT · 17579 days ago · 10 km deep · 83 km away
15. 1.922 km NE of San Lucas, CaliforniaSat, Aug 19, 3:33 PM PDT · 17578 days ago · 6 km deep · 82 km away
16. 2.09 km SSW of Avenal, CaliforniaSun, Aug 20, 12:34 PM PDT · 17577 days ago · 14 km deep · 76 km away
17. 1.814 km SE of Parkfield, CaliforniaFri, Aug 25, 2:54 AM PDT · 17573 days ago · 8 km deep · 54 km away
18. 2.651 km WSW of San Simeon, CaliforniaWed, Aug 30, 5:37 PM PDT · 17567 days ago · 3 km deep · 77 km away
19. 1.513 km NW of Parkfield, CaliforniaSun, Sep 3, 3:24 PM PDT · 17563 days ago · 5 km deep · 56 km away
20. 2.339 km SW of Cambria, CaliforniaMon, Sep 4, 4:50 PM PDT · 17562 days ago · 5 km deep · 54 km away
21. 2.522 km ENE of San Ardo, CaliforniaMon, Sep 4, 7:41 PM PDT · 17562 days ago · 6 km deep · 67 km away
22. 2.222 km ENE of San Lucas, CaliforniaMon, Sep 4, 7:45 PM PDT · 17562 days ago · 9 km deep · 78 km away
23. 1.814 km NW of Parkfield, CaliforniaTue, Sep 5, 4:06 PM PDT · 17561 days ago · 5 km deep · 57 km away
24. 1.713 km WSW of Cayucos, CaliforniaWed, Sep 6, 3:53 AM PDT · 17561 days ago · 4 km deep · 24 km away
25. 2.125 km NNE of King City, CaliforniaWed, Sep 6, 7:37 AM PDT · 17561 days ago · 1 km deep · 97 km away
26. 1.623 km NE of King City, CaliforniaFri, Sep 8, 1:24 AM PDT · 17559 days ago · 2 km deep · 91 km away
27. 2.017 km NW of Parkfield, CaliforniaFri, Sep 8, 9:01 AM PDT · 17559 days ago · 5 km deep · 58 km away
28. 1.929 km SE of Big Sur, CaliforniaWed, Sep 13, 6:15 AM PDT · 17554 days ago · 10 km deep · 90 km away
29. 2.26 km NW of Parkfield, CaliforniaWed, Sep 13, 7:22 PM PDT · 17553 days ago · 10 km deep · 55 km away
30. 1.66 km NW of Parkfield, CaliforniaWed, Sep 13, 7:24 PM PDT · 17553 days ago · 10 km deep · 55 km away
31. 1.55 km ENE of Garden Farms, CaliforniaMon, Sep 18, 5:25 PM PDT · 17548 days ago · 4 km deep · 29 km away
32. 2.125 km WSW of Coalinga, CaliforniaTue, Sep 19, 4:30 PM PDT · 17547 days ago · 2 km deep · 62 km away
33. 2.26km ENE of Orcutt, CATue, Sep 19, 5:39 PM PDT · 17547 days ago · 0 km deep · 83 km away
34. 1.910 km NNW of Parkfield, CaliforniaWed, Sep 20, 1:55 AM PDT · 17547 days ago · 13 km deep · 59 km away
35. 2.023 km NW of Parkfield, CaliforniaThu, Sep 21, 12:34 AM PDT · 17546 days ago · 3 km deep · 61 km away

Before

1. 1.99 km NW of Parkfield, CaliforniaSun, Jul 23, 8:34 AM PDT · 17606 days ago · 7 km deep · 56 km away
2. 3.29 km NW of Parkfield, CaliforniaSun, Jul 23, 7:38 AM PDT · 17606 days ago · 7 km deep · 56 km away
3. 1.616 km NW of Parkfield, CaliforniaFri, Jul 21, 6:29 AM PDT · 17608 days ago · 4 km deep · 58 km away
4. 2.120 km NW of Parkfield, CaliforniaFri, Jul 21, 5:36 AM PDT · 17608 days ago · 8 km deep · 60 km away
5. 1.822 km NE of San Lucas, CaliforniaThu, Jul 20, 12:29 AM PDT · 17609 days ago · 7 km deep · 81 km away
6. 2.620 km SW of Los Osos, CaliforniaTue, Jul 11, 2:07 AM PDT · 17618 days ago · 9 km deep · 44 km away
7. 2.013 km NW of Parkfield, CaliforniaSat, Jul 8, 10:18 PM PDT · 17620 days ago · 4 km deep · 57 km away
8. 1.513 km NW of Parkfield, CaliforniaThu, Jul 6, 10:40 PM PDT · 17622 days ago · 5 km deep · 56 km away
9. 2.36 km N of Avenal, CaliforniaSun, Jul 2, 1:00 PM PDT · 17626 days ago · 6 km deep · 87 km away
10. 1.723 km NE of King City, CaliforniaWed, Jun 28, 11:06 AM PDT · 17631 days ago · 4 km deep · 91 km away
11. 1.813 km SSE of Parkfield, CaliforniaSun, Jun 25, 1:01 AM PDT · 17634 days ago · 9 km deep · 53 km away
12. 1.74 km NW of Parkfield, CaliforniaFri, Jun 23, 8:52 PM PDT · 17635 days ago · 5 km deep · 55 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1041192. Read Mon, Oct 5, 2026, 5:35 AM UTC.