California earthquakes

M1.9 earthquake 2 km ESE of Aromas, California

A magnitude 1.9 earthquake struck 2 km ESE of Aromas, California on Sun, Aug 27, 1978, 10:33 PM PDT (05:33 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.2 37km SSW of Half Moon Bay, CA. This one was a foreshock.

Aromas forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude
1.9 (md), micro
Local time
UTC
1978-08-28 05:33:01 UTC
Depth
7.0 km (4.3 mi), shallow
Epicenter
36.883° N, 121.618° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
54°
Stations used
39

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 169 in the 60 days after this one and 54 in the 30 days before it.

After

  1. 3.021 km NE of Soledad, California · 17565 days ago · 7 km deep · 58 km away
  2. 2.115 km SE of Livermore, California · 17565 days ago · 2 km deep · 76 km away
  3. 2.39 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 53 km away
  4. 1.79 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 53 km away
  5. 4.19 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 53 km away
  6. 2.010 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 52 km away
  7. 1.89 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 53 km away
  8. 3.810 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 52 km away
  9. 1.59 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 52 km away
  10. 2.210 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 52 km away
  11. 2.69 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 53 km away
  12. 2.59 km ESE of East Foothills, California · 17565 days ago · 5 km deep · 53 km away
  13. 1.510 km ESE of East Foothills, California · 17565 days ago · 8 km deep · 51 km away
  14. 2.110 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 52 km away
  15. 1.810 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 52 km away
  16. 1.610 km ESE of East Foothills, California · 17565 days ago · 7 km deep · 52 km away
  17. 2.010 km ESE of East Foothills, California · 17564 days ago · 8 km deep · 52 km away
  18. 2.410 km ESE of East Foothills, California · 17564 days ago · 8 km deep · 52 km away
  19. 1.510 km ESE of East Foothills, California · 17564 days ago · 8 km deep · 52 km away
  20. 2.616 km SSE of Tres Pinos, California · 17564 days ago · 6 km deep · 40 km away
  21. 1.816 km SSE of Tres Pinos, California · 17564 days ago · 6 km deep · 40 km away
  22. 2.016 km SSE of Tres Pinos, California · 17564 days ago · 6 km deep · 40 km away
  23. 2.216 km SSE of Tres Pinos, California · 17564 days ago · 6 km deep · 40 km away
  24. 2.415 km SSE of Tres Pinos, California · 17564 days ago · 6 km deep · 40 km away
  25. 2.0Central California · 17563 days ago · 2 km deep · 48 km away
  26. 1.716 km NE of East Foothills, California · 17563 days ago · 6 km deep · 68 km away
  27. 1.710 km ESE of East Foothills, California · 17563 days ago · 7 km deep · 52 km away
  28. 2.46 km ENE of Seven Trees, California · 17562 days ago · 5 km deep · 50 km away
  29. 2.46 km ENE of Seven Trees, California · 17561 days ago · 6 km deep · 50 km away
  30. 3.36 km ENE of Seven Trees, California · 17561 days ago · 5 km deep · 50 km away
  31. 1.713 km E of Seven Trees, California · 17560 days ago · 1 km deep · 46 km away
  32. 1.87 km NE of Interlaken, California · 17560 days ago · 4 km deep · 14 km away
  33. 1.915 km SW of Los Banos, California · 17560 days ago · 6 km deep · 58 km away
  34. 2.323 km NE of Greenfield, California · 17559 days ago · 9 km deep · 69 km away
  35. 1.92 km ENE of Ridgemark, California · 17558 days ago · 6 km deep · 25 km away
  36. 1.621 km NE of Soledad, California · 17558 days ago · 0 km deep · 50 km away
  37. 1.79 km ESE of Gilroy, California · 17558 days ago · 4 km deep · 17 km away
  38. 2.66 km ENE of Seven Trees, California · 17557 days ago · 5 km deep · 50 km away
  39. 1.612 km SW of Soledad, California · 17557 days ago · 11 km deep · 62 km away
  40. 2.125 km NNE of King City, California · 17556 days ago · 1 km deep · 78 km away
  41. 2.59 km SSE of Tres Pinos, California · 17555 days ago · 5 km deep · 35 km away
  42. 1.86 km NE of Ridgemark, California · 17555 days ago · 5 km deep · 26 km away
  43. 1.623 km NE of King City, California · 17555 days ago · 2 km deep · 86 km away
  44. 1.81 km SE of East Foothills, California · 17554 days ago · 5 km deep · 56 km away
  45. 1.63 km NE of Tres Pinos, California · 17554 days ago · 8 km deep · 30 km away
  46. 2.35 km ENE of Aromas, California · 17553 days ago · 8 km deep · 4 km away
  47. 2.310 km S of Tres Pinos, California · 17552 days ago · 3 km deep · 33 km away
  48. 3.410 km S of Tres Pinos, California · 17552 days ago · 4 km deep · 33 km away
  49. 2.46 km ENE of Seven Trees, California · 17552 days ago · 5 km deep · 50 km away
  50. 1.610 km S of Tres Pinos, California · 17552 days ago · 3 km deep · 33 km away
  51. 2.26 km E of East Foothills, California · 17551 days ago · 7 km deep · 56 km away
  52. 1.929 km SE of Big Sur, California · 17549 days ago · 10 km deep · 90 km away
  53. 1.627 km NE of Soledad, California · 17549 days ago · 9 km deep · 57 km away
  54. 1.510 km S of Tres Pinos, California · 17548 days ago · 3 km deep · 33 km away
  55. 3.210 km S of Tres Pinos, California · 17548 days ago · 4 km deep · 33 km away
  56. 1.99 km S of Tres Pinos, California · 17548 days ago · 4 km deep · 32 km away
  57. 2.19 km S of Tres Pinos, California · 17548 days ago · 3 km deep · 32 km away
  58. 1.79 km S of Tres Pinos, California · 17547 days ago · 4 km deep · 32 km away
  59. 1.89 km S of Tres Pinos, California · 17547 days ago · 4 km deep · 32 km away
  60. 2.36 km E of East Foothills, California · 17547 days ago · 7 km deep · 57 km away

The first 60 of 169.

Before

  1. 3.26 km SE of Sunol, California · 17566 days ago · 10 km deep · 77 km away
  2. 2.32 km ESE of Tres Pinos, California · 17566 days ago · 9 km deep · 31 km away
  3. 1.721 km NE of Soledad, California · 17566 days ago · 5 km deep · 58 km away
  4. 1.53 km W of Ridgemark, California · 17566 days ago · 7 km deep · 21 km away
  5. 2.23 km NNW of Hollister, California · 17566 days ago · 7 km deep · 18 km away
  6. 1.78 km NE of Gilroy, California · 17566 days ago · 8 km deep · 22 km away
  7. 1.64 km SW of Tres Pinos, California · 17569 days ago · 6 km deep · 28 km away
  8. 3.126 km WNW of Diablo Grande, California · 17569 days ago · 5 km deep · 69 km away
  9. 2.08 km WSW of Saratoga, California · 17570 days ago · 10 km deep · 57 km away
  10. 2.31 km SW of Los Altos Hills, California · 17571 days ago · 4 km deep · 72 km away
  11. 1.723 km ENE of Soledad, California · 17571 days ago · 6 km deep · 65 km away
  12. 1.72 km SW of San Juan Bautista, California · 17571 days ago · 7 km deep · 8 km away
  13. 1.68 km N of Morgan Hill, California · 17572 days ago · 4 km deep · 36 km away
  14. 1.821 km NE of Soledad, California · 17572 days ago · 5 km deep · 53 km away
  15. 2.124 km E of Tres Pinos, California · 17574 days ago · 1 km deep · 52 km away
  16. 2.024 km E of Tres Pinos, California · 17574 days ago · 0 km deep · 52 km away
  17. 1.922 km NE of San Lucas, California · 17574 days ago · 6 km deep · 96 km away
  18. 2.237 km SE of Big Sur, California · 17575 days ago · 10 km deep · 99 km away
  19. 1.86 km NNE of Ridgemark, California · 17575 days ago · 6 km deep · 26 km away
  20. 2.6Central California · 17576 days ago · 7 km deep · 7 km away

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1041916. Read Wed, Sep 30, 2026, 8:21 PM UTC.