M1.8 earthquake 3km S of Concord, CA

Magnitude

1.8 (Md, duration), micro

Magnitude from

Northern California Seismic System

Local time

Wed, Apr 21, 2021, 8:38 PM PDT

UTC

2021-04-22 03:38:27 UTC

Depth

10.5 km (6.5 mi), shallow

Epicenter

37.942° N, 122.020° W

Region

California

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.1 km horizontally, 0.2 km in depth

Magnitude uncertainty

±0.13

Depth from

From location

Station coverage gap

82°

Stations used

41

• Waldon, CaliforniaPopulation 5,364. Forecast4 kmENE
• Pleasant Hill, CaliforniaPopulation 34,810. Forecast4 kmE
• Concord, CaliforniaPopulation 128,667. Forecast4 kmSSE
• Los Angeles, CaliforniaPopulation 3,820,914. Forecast550 kmNW

After

1. 1.910km SSE of Elmira, CAWed, Apr 21, 11:39 PM PDT · 1992 days ago · 23 km deep · 39 km away
2. 1.64km W of Kenwood, CAThu, Apr 22, 12:49 PM PDT · 1991 days ago · 7 km deep · 72 km away
3. 1.83km WSW of Oakley, CASat, Apr 24, 9:57 PM PDT · 1989 days ago · 17 km deep · 24 km away
4. 3.615km N of Morgan Hill, CASat, Apr 24, 9:59 PM PDT · 1989 days ago · 8 km deep · 82 km away · felt by 2,036
5. 2.515km N of Morgan Hill, CASat, Apr 24, 10:00 PM PDT · 1989 days ago · 7 km deep · 82 km away · felt by 52
6. 2.52km N of Piedmont, CAMon, Apr 26, 4:44 AM PDT · 1988 days ago · 6 km deep · 22 km away · felt by 1,284
7. 1.77km W of Newark, CAMon, Apr 26, 12:22 PM PDT · 1987 days ago · 14 km deep · 46 km away
8. 1.54km SW of Glen Ellen, CATue, Apr 27, 11:18 PM PDT · 1986 days ago · 5 km deep · 65 km away
9. 2.82km N of Piedmont, CAWed, Apr 28, 12:18 AM PDT · 1986 days ago · 6 km deep · 22 km away · felt by 2,614
10. 2.16km W of Yountville, CAThu, Apr 29, 2:36 AM PDT · 1985 days ago · 5 km deep · 63 km away
11. 2.11km WNW of Danville, CASun, May 2, 1:51 PM PDT · 1981 days ago · 7 km deep · 13 km away · felt by 3
12. 1.64km NNW of Pacifica, CATue, May 4, 5:07 PM PDT · 1979 days ago · 6 km deep · 54 km away
13. 2.510km E of Alum Rock, CAThu, May 6, 6:42 AM PDT · 1978 days ago · 7 km deep · 71 km away · felt by 2
14. 1.50km NW of Danville, CAThu, May 6, 10:13 AM PDT · 1978 days ago · 7 km deep · 13 km away
15. 2.315km E of Seven Trees, CASat, May 8, 12:04 AM PDT · 1976 days ago · 5 km deep · 78 km away · felt by 1
16. 1.62km W of Concord, CASat, May 8, 4:26 PM PDT · 1975 days ago · 3 km deep · 3 km away
17. 1.91km N of East Richmond Heights, CASat, May 8, 8:18 PM PDT · 1975 days ago · 9 km deep · 26 km away
18. 2.312km SW of Muir Beach, CASat, May 8, 9:06 PM PDT · 1975 days ago · 6 km deep · 60 km away
19. 1.76km SW of Calistoga, CASun, May 9, 4:55 AM PDT · 1975 days ago · 8 km deep · 84 km away
20. 1.95km W of Glen Ellen, CAMon, May 10, 11:21 AM PDT · 1974 days ago · 5 km deep · 69 km away
21. 1.55km WSW of Lexington Hills, CATue, May 11, 1:47 PM PDT · 1972 days ago · 13 km deep · 88 km away
22. 1.510km NE of San Martin, CAThu, May 13, 6:29 PM PDT · 1970 days ago · 8 km deep · 98 km away
23. 1.58km SE of Middletown, CAFri, May 14, 3:48 AM PDT · 1970 days ago · 5 km deep · 97 km away
24. 1.61km ENE of Alameda, CAFri, May 14, 10:05 AM PDT · 1970 days ago · 7 km deep · 27 km away
25. 1.54km NW of Dublin, CASat, May 15, 1:59 AM PDT · 1969 days ago · 5 km deep · 24 km away
26. 2.215km NNE of Angwin, CAMon, May 17, 12:39 AM PDT · 1967 days ago · 8 km deep · 92 km away
27. 2.015km NNE of Angwin, CAMon, May 17, 1:03 AM PDT · 1967 days ago · 9 km deep · 91 km away
28. 1.615km NNE of Angwin, CAMon, May 17, 3:58 AM PDT · 1967 days ago · 9 km deep · 91 km away
29. 1.714km NNE of Angwin, CAMon, May 17, 1:47 PM PDT · 1966 days ago · 9 km deep · 91 km away
30. 2.06km S of Calistoga, CAMon, May 17, 2:21 PM PDT · 1966 days ago · 7 km deep · 81 km away · felt by 2
31. 1.616km NE of Alum Rock, CATue, May 18, 2:19 AM PDT · 1966 days ago · 3 km deep · 62 km away
32. 1.82km ESE of Berkeley, CATue, May 18, 12:29 PM PDT · 1965 days ago · 9 km deep · 22 km away
33. 1.72km ESE of Berkeley, CAWed, May 19, 3:04 AM PDT · 1965 days ago · 9 km deep · 22 km away
34. 1.96km SW of Clayton, CAWed, May 19, 8:10 PM PDT · 1964 days ago · 12 km deep · 6 km away · felt by 4
35. 1.513km ESE of Hidden Valley Lake, CAThu, May 20, 12:05 PM PDT · 1963 days ago · 8 km deep · 98 km away
36. 1.66km SE of St. Helena, CAThu, May 20, 5:35 PM PDT · 1963 days ago · 10 km deep · 68 km away
37. 1.65km NW of Dublin, CAMon, May 24, 8:15 AM PDT · 1960 days ago · 6 km deep · 24 km away
38. 2.25km NW of Dublin, CAMon, May 24, 11:19 PM PDT · 1959 days ago · 3 km deep · 24 km away · felt by 46
39. 2.06km WNW of Dublin, CAMon, May 24, 11:19 PM PDT · 1959 days ago · 7 km deep · 24 km away
40. 2.25km WNW of Dublin, CAMon, May 24, 11:20 PM PDT · 1959 days ago · 7 km deep · 24 km away · felt by 10
41. 2.17km ESE of Roseland, CATue, May 25, 2:59 AM PDT · 1959 days ago · 10 km deep · 75 km away · felt by 2
42. 2.16km WNW of Dublin, CATue, May 25, 3:16 PM PDT · 1958 days ago · 7 km deep · 24 km away · felt by 18
43. 1.65km NW of Dublin, CATue, May 25, 7:48 PM PDT · 1958 days ago · 7 km deep · 24 km away
44. 1.95km NW of Dublin, CAWed, May 26, 6:30 PM PDT · 1957 days ago · 4 km deep · 23 km away
45. 1.89km E of Blackhawk, CAThu, May 27, 11:47 AM PDT · 1956 days ago · 13 km deep · 23 km away
46. 2.010km E of Blackhawk, CAThu, May 27, 11:50 AM PDT · 1956 days ago · 15 km deep · 23 km away · felt by 2
47. 1.79km NNE of Yountville, CAThu, May 27, 6:53 PM PDT · 1956 days ago · 6 km deep · 64 km away
48. 1.61km SW of Danville, CAFri, May 28, 9:09 PM PDT · 1955 days ago · 10 km deep · 14 km away
49. 2.24km WSW of Daly City, CASun, May 30, 2:23 AM PDT · 1954 days ago · 12 km deep · 52 km away · felt by 8
50. 1.82km ENE of Oakland, CASun, May 30, 12:12 PM PDT · 1953 days ago · 10 km deep · 23 km away
51. 2.42km ENE of Pacheco, CATue, Jun 1, 7:21 AM PDT · 1952 days ago · 15 km deep · 6 km away
52. 1.67km SW of Los Altos Hills, CATue, Jun 1, 8:40 AM PDT · 1952 days ago · 9 km deep · 70 km away
53. 3.69km E of Alum Rock, CAThu, Jun 3, 5:15 AM PDT · 1950 days ago · 7 km deep · 68 km away · felt by 1,401
54. 1.79km E of Alum Rock, CAThu, Jun 3, 5:28 AM PDT · 1950 days ago · 6 km deep · 68 km away
55. 2.19km E of Alum Rock, CAThu, Jun 3, 6:58 AM PDT · 1950 days ago · 6 km deep · 68 km away · felt by 31
56. 2.49km SE of Livermore, CASat, Jun 5, 12:10 PM PDT · 1947 days ago · 7 km deep · 45 km away
57. 1.611km WSW of Saratoga, CASat, Jun 5, 7:34 PM PDT · 1947 days ago · 8 km deep · 79 km away
58. 1.73km N of Piedmont, CATue, Jun 8, 10:57 PM PDT · 1944 days ago · 6 km deep · 22 km away
59. 1.61km W of Alamo, CAWed, Jun 9, 11:56 AM PDT · 1943 days ago · 9 km deep · 10 km away
60. 1.99km E of Alum Rock, CAThu, Jun 10, 9:08 PM PDT · 1942 days ago · 7 km deep · 68 km away

The first 60 of 73.

Before

1. 1.66km SSW of Calistoga, CATue, Apr 20, 7:42 AM PDT · 1994 days ago · 6 km deep · 83 km away
2. 2.36km WSW of Colma, CAMon, Apr 19, 7:54 AM PDT · 1995 days ago · 8 km deep · 54 km away · felt by 13
3. 1.63km NNW of Angwin, CASun, Apr 18, 9:47 AM PDT · 1996 days ago · 0 km deep · 83 km away
4. 1.66km SSW of Calistoga, CASat, Apr 17, 5:44 PM PDT · 1996 days ago · 9 km deep · 83 km away
5. 1.810km ENE of Morgan Hill, CAFri, Apr 16, 4:11 AM PDT · 1998 days ago · 6 km deep · 96 km away
6. 2.214km SE of Livermore, CAThu, Apr 15, 1:19 AM PDT · 1999 days ago · 4 km deep · 50 km away · felt by 2
7. 1.59km ENE of Milpitas, CAWed, Apr 14, 11:50 PM PDT · 1999 days ago · 7 km deep · 55 km away
8. 2.13km WNW of Pacifica, CASun, Apr 11, 8:47 PM PDT · 2002 days ago · 9 km deep · 56 km away · felt by 13
9. 2.09km ENE of Milpitas, CASun, Apr 11, 2:10 PM PDT · 2002 days ago · 7 km deep · 56 km away
10. 2.314km SE of Livermore, CASun, Apr 11, 2:02 AM PDT · 2003 days ago · 4 km deep · 50 km away · felt by 2
11. 3.36km S of Calistoga, CASat, Apr 10, 7:13 AM PDT · 2004 days ago · 9 km deep · 81 km away · felt by 262
12. 2.914km SE of Livermore, CASat, Apr 10, 4:50 AM PDT · 2004 days ago · 4 km deep · 50 km away · felt by 70
13. 1.66km NNE of Windsor, CAWed, Apr 7, 1:57 PM PDT · 2006 days ago · 5 km deep · 99 km away
14. 1.81km SW of East Richmond Heights, CAWed, Apr 7, 11:32 AM PDT · 2007 days ago · 4 km deep · 26 km away
15. 2.56km S of Calistoga, CAWed, Apr 7, 8:17 AM PDT · 2007 days ago · 9 km deep · 81 km away · felt by 10
16. 2.40km W of Pleasant Hill, CAWed, Apr 7, 6:45 AM PDT · 2007 days ago · 11 km deep · 4 km away · felt by 54
17. 2.420km SE of Livermore, CAMon, Apr 5, 6:44 PM PDT · 2008 days ago · 2 km deep · 55 km away
18. 1.610km NE of Milpitas, CAFri, Apr 2, 1:51 AM PDT · 2012 days ago · 5 km deep · 53 km away
19. 2.14km WSW of Pleasanton, CAThu, Apr 1, 9:50 AM PDT · 2013 days ago · 8 km deep · 34 km away
20. 1.610km WNW of Calistoga, CAThu, Apr 1, 2:33 AM PDT · 2013 days ago · 8 km deep · 95 km away · felt by 1

From the USGS Earthquake Hazards Program and its partner networks, event nc73552835. Read Mon, Oct 5, 2026, 6:13 AM UTC.