M2.4 earthquake 2 km NE of Pacheco, California

Magnitude

2.4 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Tue, Oct 17, 1978, 5:37 PM PDT

UTC

1978-10-18 00:37:31 UTC

Depth

15.1 km (9.4 mi), shallow

Epicenter

37.995° N, 122.057° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.6 km in depth

Magnitude uncertainty

±0.09

Depth from

From location

Station coverage gap

52°

Stations used

27

• Pacheco, CaliforniaPopulation 3,685. Forecast2 kmNE
• Concord, CaliforniaPopulation 128,667. Forecast3 kmNW
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast556 kmNW

After

1. 1.75 km NE of East Foothills, CaliforniaFri, Oct 20, 6:13 PM PDT · 17516 days ago · 6 km deep · 69 km away
2. 2.00 km WSW of Lexington Hills, CaliforniaSat, Oct 21, 3:12 AM PDT · 17516 days ago · 10 km deep · 93 km away
3. 1.87 km S of Sunol, CaliforniaSat, Oct 21, 8:13 AM PDT · 17515 days ago · 8 km deep · 54 km away
4. 1.96 km ENE of East Foothills, CaliforniaSun, Oct 22, 12:30 AM PDT · 17515 days ago · 8 km deep · 71 km away
5. 2.09 km E of Moskowite Corner, CaliforniaMon, Oct 23, 9:21 AM PDT · 17513 days ago · 14 km deep · 48 km away
6. 1.616 km ESE of Hidden Valley Lake, CaliforniaTue, Oct 24, 10:13 AM PDT · 17512 days ago · 5 km deep · 87 km away
7. 3.114 km N of Morgan Hill, CaliforniaFri, Oct 27, 5:00 AM PDT · 17510 days ago · 5 km deep · 90 km away
8. 1.716 km ESE of Hidden Valley Lake, CaliforniaFri, Oct 27, 5:11 AM PDT · 17510 days ago · 8 km deep · 87 km away
9. 1.87 km SW of Calistoga, CaliforniaSat, Oct 28, 3:50 AM PDT · 17509 days ago · 5 km deep · 77 km away
10. 2.612 km ESE of Hidden Valley Lake, CaliforniaSat, Oct 28, 1:50 PM PDT · 17508 days ago · 7 km deep · 91 km away
11. 1.64 km SSW of Alamo, CaliforniaSun, Oct 29, 8:43 PM PST · 17507 days ago · 12 km deep · 21 km away
12. 2.03 km N of East Foothills, CaliforniaThu, Nov 2, 3:09 AM PST · 17504 days ago · 1 km deep · 68 km away
13. 1.56 km SSE of Sunol, CaliforniaThu, Nov 2, 11:48 AM PST · 17503 days ago · 8 km deep · 53 km away
14. 1.711 km ESE of East Foothills, CaliforniaFri, Nov 3, 12:15 AM PST · 17503 days ago · 7 km deep · 80 km away
15. 1.78 km ESE of Alum Rock, CaliforniaSat, Nov 4, 2:00 PM PST · 17501 days ago · 3 km deep · 78 km away
16. 1.810 km S of Muir Beach, CaliforniaSun, Nov 5, 7:23 AM PST · 17500 days ago · 9 km deep · 52 km away
17. 1.89 km N of Boulder Creek, CaliforniaMon, Nov 6, 7:24 PM PST · 17499 days ago · 11 km deep · 87 km away
18. 2.09 km ESE of East Foothills, CaliforniaMon, Nov 6, 11:09 PM PST · 17499 days ago · 8 km deep · 78 km away
19. 1.613 km SSE of Livermore, CaliforniaTue, Nov 7, 2:07 AM PST · 17499 days ago · 2 km deep · 56 km away
20. 1.62 km SSE of Concord, CaliforniaTue, Nov 7, 2:54 AM PST · 17499 days ago · 10 km deep · 5 km away
21. 2.21 km NNE of Montara, CaliforniaTue, Nov 7, 5:53 PM PST · 17498 days ago · 7 km deep · 63 km away
22. 2.16 km NNE of Chinatown, CaliforniaWed, Nov 8, 3:43 PM PST · 17497 days ago · 1 km deep · 32 km away
23. 2.017 km ENE of East Foothills, CaliforniaSat, Nov 11, 6:24 PM PST · 17494 days ago · 5 km deep · 74 km away
24. 1.616 km E of East Foothills, CaliforniaSat, Nov 11, 7:26 PM PST · 17494 days ago · 4 km deep · 78 km away
25. 2.08 km ESE of East Foothills, CaliforniaTue, Nov 14, 5:51 PM PST · 17491 days ago · 8 km deep · 77 km away
26. 1.89 km ESE of East Foothills, CaliforniaTue, Nov 14, 6:10 PM PST · 17491 days ago · 8 km deep · 77 km away
27. 1.916 km ENE of East Foothills, CaliforniaThu, Nov 16, 12:41 AM PST · 17490 days ago · 6 km deep · 74 km away
28. 1.85 km SSW of Saint Helena, CaliforniaFri, Nov 17, 3:38 AM PST · 17489 days ago · 5 km deep · 64 km away
29. 2.112 km SSW of Dillon Beach, CaliforniaSat, Nov 18, 5:53 AM PST · 17487 days ago · 2 km deep · 85 km away
30. 1.810 km ESE of East Foothills, CaliforniaMon, Nov 20, 8:00 PM PST · 17485 days ago · 8 km deep · 79 km away
31. 1.510 km ESE of East Foothills, CaliforniaMon, Nov 20, 8:44 PM PST · 17485 days ago · 8 km deep · 78 km away
32. 1.74 km E of Livermore, CaliforniaThu, Nov 23, 4:16 AM PST · 17482 days ago · 9 km deep · 46 km away
33. 2.114 km SE of Livermore, CaliforniaSun, Nov 26, 8:22 PM PST · 17479 days ago · 1 km deep · 57 km away
34. 1.711 km SE of Sunol, CaliforniaThu, Nov 30, 2:43 PM PST · 17475 days ago · 3 km deep · 57 km away
35. 2.113 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 30, 3:12 PM PST · 17475 days ago · 8 km deep · 90 km away
36. 2.212 km ESE of Hidden Valley Lake, CaliforniaThu, Nov 30, 9:40 PM PST · 17475 days ago · 10 km deep · 92 km away
37. 1.76 km NE of Rohnert Park, CaliforniaSun, Dec 3, 5:46 PM PST · 17472 days ago · 8 km deep · 68 km away
38. 2.48 km SE of Sunol, CaliforniaMon, Dec 4, 6:29 AM PST · 17471 days ago · 10 km deep · 55 km away
39. 2.419 km WSW of Diablo Grande, CaliforniaThu, Dec 7, 9:10 PM PST · 17468 days ago · 7 km deep · 92 km away
40. 2.112 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:51 AM PST · 17467 days ago · 8 km deep · 91 km away
41. 1.512 km ESE of Hidden Valley Lake, CaliforniaFri, Dec 8, 9:54 AM PST · 17467 days ago · 8 km deep · 91 km away
42. 1.64 km E of Saint Helena, CaliforniaFri, Dec 8, 11:59 AM PST · 17467 days ago · 5 km deep · 65 km away
43. 1.7Northern CaliforniaSat, Dec 9, 8:07 AM PST · 17466 days ago · 18 km deep · 93 km away
44. 2.0Northern CaliforniaSat, Dec 9, 9:56 PM PST · 17466 days ago · 8 km deep · 91 km away
45. 2.110 km SE of Sonoma, CaliforniaMon, Dec 11, 3:46 AM PST · 17465 days ago · 7 km deep · 37 km away
46. 1.912 km ESE of Hidden Valley Lake, CaliforniaWed, Dec 13, 10:06 AM PST · 17462 days ago · 8 km deep · 91 km away
47. 2.13 km E of Berkeley, CaliforniaThu, Dec 14, 4:04 AM PST · 17462 days ago · 11 km deep · 20 km away
48. 1.93 km E of Moraga, CaliforniaThu, Dec 14, 8:51 PM PST · 17461 days ago · 2 km deep · 18 km away

Before

1. 1.63 km SW of Oakville, CaliforniaSun, Oct 15, 7:59 AM PDT · 17521 days ago · 7 km deep · 56 km away
2. 1.912 km E of Seven Trees, CaliforniaWed, Oct 11, 9:48 AM PDT · 17525 days ago · 1 km deep · 85 km away
3. 1.67 km NE of East Foothills, CaliforniaTue, Oct 10, 9:04 PM PDT · 17526 days ago · 11 km deep · 67 km away
4. 1.86 km N of Benicia, CaliforniaThu, Oct 5, 4:03 PM PDT · 17531 days ago · 1 km deep · 16 km away
5. 2.03 km NW of Bayview, CaliforniaMon, Oct 2, 4:28 PM PDT · 17534 days ago · 7 km deep · 26 km away
6. 2.48 km ESE of East Foothills, CaliforniaSun, Oct 1, 3:41 AM PDT · 17536 days ago · 1 km deep · 76 km away
7. 2.016 km E of Seven Trees, CaliforniaFri, Sep 29, 6:33 PM PDT · 17537 days ago · 7 km deep · 86 km away
8. 1.61 km SSW of Monument Hills, CaliforniaThu, Sep 28, 6:16 PM PDT · 17538 days ago · 9 km deep · 74 km away
9. 2.06 km WSW of Kenwood, CaliforniaWed, Sep 27, 1:30 PM PDT · 17539 days ago · 7 km deep · 66 km away
10. 2.93 km ENE of East Foothills, CaliforniaTue, Sep 26, 12:52 PM PDT · 17540 days ago · 1 km deep · 71 km away
11. 1.96 km ESE of Santa Rosa, CaliforniaWed, Sep 20, 9:07 AM PDT · 17546 days ago · 8 km deep · 70 km away
12. 2.88 km NW of Broadmoor, CaliforniaTue, Sep 19, 8:52 AM PDT · 17547 days ago · 6 km deep · 53 km away

From the USGS Earthquake Hazards Program and its partner networks, event nc1042890. Read Sun, Oct 4, 2026, 11:43 PM UTC.