California earthquakes

M1.8 earthquake 7km SW of Ridgemark, CA

A magnitude 1.8 earthquake struck 7km SW of Ridgemark, CA on Wed, Apr 21, 2021, 9:07 PM PDT (04:07 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.6 3km NE of Pinnacles, CA. This one was a foreshock.

Ridgemark 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
1.8 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-04-22 04:07:27 UTC
Depth
11.0 km (6.8 mi), shallow
Epicenter
36.760° N, 121.417° 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 0.3 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.27
Depth from
From location
Station coverage gap
80°
Stations used
37

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 134 in the 60 days after this one and 68 in the 30 days before it.

After

  1. 1.814km ESE of Pinnacles, CA · 1989 days ago · 11 km deep · 49 km away
  2. 2.211km NE of New Idria, CA · 1989 days ago · 9 km deep · 78 km away
  3. 1.98km WNW of Del Monte Forest, CA · 1989 days ago · 14 km deep · 58 km away
  4. 2.522km NE of San Lucas, CA · 1988 days ago · 10 km deep · 73 km away · felt by 2
  5. 2.39km SSE of San Juan Bautista, CA · 1988 days ago · 7 km deep · 7 km away
  6. 2.89km SSE of San Juan Bautista, CA · 1988 days ago · 8 km deep · 7 km away · felt by 22
  7. 3.615km N of Morgan Hill, CA · 1988 days ago · 8 km deep · 60 km away · felt by 2,036
  8. 2.515km N of Morgan Hill, CA · 1988 days ago · 7 km deep · 60 km away · felt by 52
  9. 1.523km NE of King City, CA · 1987 days ago · 8 km deep · 62 km away
  10. 1.97km NNW of Pinnacles, CA · 1987 days ago · 6 km deep · 29 km away · felt by 2
  11. 2.12km WNW of Newman, CA · 1986 days ago · 0 km deep · 70 km away
  12. 2.116km NW of Pinnacles, CA · 1985 days ago · 8 km deep · 20 km away
  13. 1.59km NNE of Gonzales, CA · 1985 days ago · 1 km deep · 20 km away
  14. 1.512km NW of Pinnacles, CA · 1985 days ago · 5 km deep · 23 km away
  15. 1.613km W of San Ardo, CA · 1985 days ago · 11 km deep · 89 km away
  16. 2.02km SSW of Hollister, CA · 1984 days ago · 6 km deep · 8 km away
  17. 2.57km NNW of Pinnacles, CA · 1983 days ago · 5 km deep · 28 km away · felt by 1
  18. 1.62km WSW of King City, CA · 1983 days ago · 10 km deep · 66 km away
  19. 2.04km N of Hollister, CA · 1982 days ago · 7 km deep · 13 km away
  20. 1.625km SSW of Los Banos, CA · 1982 days ago · 10 km deep · 44 km away
  21. 2.122km ENE of San Lucas, CA · 1982 days ago · 9 km deep · 80 km away
  22. 2.413km NW of Pinnacles, CA · 1982 days ago · 5 km deep · 23 km away
  23. 2.220km SE of Pinnacles, CA · 1982 days ago · 10 km deep · 55 km away
  24. 1.86km SW of San Ardo, CA · 1980 days ago · 10 km deep · 96 km away
  25. 2.128km NE of Pinnacles, CA · 1980 days ago · 4 km deep · 44 km away
  26. 1.63km ESE of Aromas, CA · 1980 days ago · 8 km deep · 22 km away
  27. 1.611km SSW of Tres Pinos, CA · 1980 days ago · 5 km deep · 9 km away
  28. 1.59km SE of Pinnacles, CA · 1979 days ago · 7 km deep · 44 km away
  29. 2.316km NW of Pinnacles, CA · 1979 days ago · 4 km deep · 19 km away
  30. 2.116km NW of Pinnacles, CA · 1979 days ago · 4 km deep · 19 km away · felt by 1
  31. 1.522km SW of New Idria, CA · 1978 days ago · 6 km deep · 72 km away
  32. 3.229km NE of Pinnacles, CA · 1978 days ago · 7 km deep · 42 km away · felt by 8
  33. 1.629km NE of Pinnacles, CA · 1978 days ago · 0 km deep · 42 km away
  34. 1.64km NE of Pinnacles, CA · 1978 days ago · 8 km deep · 35 km away
  35. 2.510km E of Alum Rock, CA · 1976 days ago · 7 km deep · 71 km away · felt by 2
  36. 2.022km ENE of San Ardo, CA · 1976 days ago · 6 km deep · 96 km away
  37. 1.612km NNE of Hollister, CA · 1976 days ago · 7 km deep · 21 km away
  38. 2.216km SSE of Tres Pinos, CA · 1976 days ago · 9 km deep · 17 km away
  39. 1.516km S of Tres Pinos, CA · 1976 days ago · 2 km deep · 15 km away
  40. 1.922km SE of Pinnacles, CA · 1976 days ago · 8 km deep · 57 km away
  41. 2.522km ENE of San Ardo, CA · 1976 days ago · 6 km deep · 96 km away · felt by 3
  42. 1.86km N of Pinnacles, CA · 1975 days ago · 10 km deep · 32 km away
  43. 1.85km ESE of Interlaken, CA · 1975 days ago · 10 km deep · 31 km away
  44. 2.315km E of Seven Trees, CA · 1975 days ago · 5 km deep · 64 km away · felt by 1
  45. 1.715km NW of Pinnacles, CA · 1975 days ago · 10 km deep · 21 km away
  46. 1.710km NW of Pinnacles, CA · 1974 days ago · 6 km deep · 25 km away
  47. 1.716km NW of Pinnacles, CA · 1973 days ago · 6 km deep · 19 km away
  48. 1.55km WSW of Lexington Hills, CA · 1971 days ago · 13 km deep · 69 km away
  49. 1.55km NNW of Pinnacles, CA · 1971 days ago · 4 km deep · 31 km away
  50. 2.09km SSW of Tres Pinos, CA · 1970 days ago · 0 km deep · 7 km away
  51. 1.915km NW of Pinnacles, CA · 1969 days ago · 6 km deep · 21 km away
  52. 1.510km NE of San Martin, CA · 1969 days ago · 8 km deep · 45 km away
  53. 1.94km NE of Pinnacles, CA · 1968 days ago · 4 km deep · 35 km away
  54. 1.63km NNE of Pinnacles, CA · 1968 days ago · 9 km deep · 34 km away
  55. 1.511km S of Tres Pinos, CA · 1967 days ago · 4 km deep · 12 km away
  56. 1.512km SE of Pinnacles, CA · 1967 days ago · 8 km deep · 47 km away
  57. 1.715km SE of Pinnacles, CA · 1966 days ago · 11 km deep · 50 km away
  58. 1.711km W of Bonny Doon, CA · 1966 days ago · 11 km deep · 83 km away
  59. 1.88km S of Los Banos, CA · 1966 days ago · 0 km deep · 55 km away
  60. 2.16km SW of San Ardo, CA · 1966 days ago · 10 km deep · 96 km away

The first 60 of 134.

Before

  1. 2.123km S of South Dos Palos, CA · 1991 days ago · 0 km deep · 65 km away · felt by 1
  2. 3.03km SW of San Juan Bautista, CA · 1992 days ago · 6 km deep · 15 km away · felt by 80
  3. 2.26km NNW of Pinnacles, CA · 1993 days ago · 5 km deep · 30 km away
  4. 1.95km ESE of Interlaken, CA · 1994 days ago · 10 km deep · 31 km away
  5. 2.27km ENE of Aromas, CA · 1994 days ago · 6 km deep · 23 km away
  6. 2.39km SSE of San Juan Bautista, CA · 1995 days ago · 5 km deep · 6 km away · felt by 1
  7. 1.810km ENE of Morgan Hill, CA · 1996 days ago · 6 km deep · 46 km away
  8. 1.617km N of Pinnacles, CA · 1997 days ago · 10 km deep · 24 km away
  9. 2.214km SE of Livermore, CA · 1998 days ago · 4 km deep · 94 km away · felt by 2
  10. 1.59km ENE of Milpitas, CA · 1998 days ago · 7 km deep · 87 km away
  11. 2.45km ESE of Aromas, CA · 1998 days ago · 6 km deep · 20 km away · felt by 3
  12. 2.15km WNW of San Juan Bautista, CA · 1998 days ago · 7 km deep · 19 km away
  13. 1.615km NW of Pinnacles, CA · 1999 days ago · 8 km deep · 20 km away
  14. 2.19km NW of Pinnacles, CA · 1999 days ago · 7 km deep · 27 km away
  15. 2.15km NNE of Pinnacles, CA · 2000 days ago · 8 km deep · 33 km away
  16. 1.78km ESE of Greenfield, CA · 2000 days ago · 6 km deep · 57 km away · felt by 1
  17. 2.09km ENE of Milpitas, CA · 2001 days ago · 7 km deep · 86 km away
  18. 1.76km SW of San Ardo, CA · 2001 days ago · 10 km deep · 97 km away
  19. 2.314km SE of Livermore, CA · 2001 days ago · 4 km deep · 94 km away · felt by 2
  20. 2.914km SE of Livermore, CA · 2002 days ago · 4 km deep · 94 km away · felt by 70

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73552845. Read Sat, Oct 3, 2026, 8:04 PM UTC.