Earthquake & tsunami bulletins in the South Atlantic Ocean

Undersea earthquakes of magnitude 5.5 and above (USGS) and the tsunami bulletins NAVAREA coordinators relay.

in force
1
last 12 months
21
vs previous 12 (19)
+11%
since 1997
583

Coverage note: the NGA archive ends 2024-05 and live collection began 2026-08-17. Warnings issued in between are here only if they were still in force when collection started, so 2024–2026 are under-counted.

In force now · 1

  1. USGS-US7000TDRVin force2026-09-02
    An earthquake of magnitude 6.2 struck the South Sandwich Islands region at 02:23:46 UTC on September 26, at a depth of 126 kilometers.
    South Sandwich Islands Region

Longest in force

  1. USGS-US7000TDRVin force2026-09-02 · 0 d
    An earthquake of magnitude 6.2 struck the South Sandwich Islands region at 02:23:46 UTC on September 26, at a depth of 126 kilometers.
    South Sandwich Islands Region

By year

97
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00
01
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03
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05
06
07
08
09
10
11
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13
14
15
16
17
18
19
20
21
22
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25
26

By month (all years)

J
F
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A
M
J
J
A
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O
N
D

Other hazards in the South Atlantic Ocean

Archive · 582 cancelled

  1. USGS-US1000HWZQ2018-11-27 → 2018-11-30
    Earthquake magnitude 5.7 (mww) in 0.942S 013.828W, depth 10 km at 271203Z nov 18
    North of Ascension Island
  2. USGS-US1000HVN92018-11-23 → 2018-11-26
    Earthquake magnitude 5.6 (mww) in 56.302S 026.988W, depth 76 km at 231051Z nov 18
    South Sandwich Islands Region
  3. USGS-US1000HSAF2018-11-15 → 2018-11-18
    Earthquake magnitude 6.4 (mww) in 56.706S 025.546W, depth 15 km at 152002Z nov 18
    South Sandwich Islands Region
  4. USGS-US1000HS5V2018-11-15 → 2018-11-18
    Earthquake magnitude 5.5 (mww) in 56.815S 025.572W, depth 10 km at 151649Z nov 18
    South Sandwich Islands Region
  5. USGS-US1000HPLE2018-11-09 → 2018-11-12
    Earthquake magnitude 5.7 (mww) in 42.713S 016.020W, depth 10 km at 090754Z nov 18
    Southern Mid-atlantic Ridge
  6. USGS-US1000HPL62018-11-09 → 2018-11-12
    Earthquake magnitude 5.5 (mb) in 42.596S 016.156W, depth 10 km at 090739Z nov 18
    Southern Mid-atlantic Ridge
  7. USGS-US2000I5JK2018-11-01 → 2018-11-04
    Earthquake magnitude 5.8 (mww) in 58.074S 025.206W, depth 29 km at 011930Z nov 18
    South Sandwich Islands Region
  8. USGS-US1000HIQV2018-10-29 → 2018-11-01
    Earthquake magnitude 5.6 (mww) in 57.542S 066.164W, depth 10 km at 292107Z oct 18
    Drake Passage
  9. USGS-US1000HIP52018-10-29 → 2018-11-01
    Earthquake magnitude 5.8 (mww) in 57.550S 066.304W, depth 10 km at 292017Z oct 18
    Drake Passage
  10. USGS-US1000HIED2018-10-29 → 2018-11-01
    Earthquake magnitude 6.3 (mww) in 57.434S 066.383W, depth 10 km at 290654Z oct 18
    Drake Passage
  11. USGS-US1000HD7H2018-10-17 → 2018-10-20
    Earthquake magnitude 5.5 (mww) in 43.620S 016.332W, depth 10 km at 170357Z oct 18
    Southern Mid-atlantic Ridge
  12. USGS-US1000H7JC2018-10-05 → 2018-10-08
    Earthquake magnitude 5.8 (mww) in 5.691S 011.525W, depth 10 km at 051459Z oct 18
    Ascension Island Region
  13. USGS-US1000H36V2018-09-27 → 2018-09-30
    Earthquake magnitude 5.8 (mww) in 58.185S 009.590W, depth 10 km at 271025Z sep 18
    East of the South Sandwich Islands
  14. USGS-US2000H8H62018-09-05 → 2018-09-08
    Earthquake magnitude 5.6 (mww) in 58.318S 024.932W, depth 10 km at 050036Z sep 18
    South Sandwich Islands Region
  15. USGS-US2000H7AJ2018-09-03 → 2018-09-06
    Earthquake magnitude 5.6 (mww) in 58.012S 025.263W, depth 29 km at 032035Z sep 18
    South Sandwich Islands Region
  16. USGS-US1000G8KF2018-08-14 → 2018-08-17
    Earthquake magnitude 6.1 (mww) in 58.134S 025.273W, depth 25 km at 140329Z aug 18
    South Sandwich Islands Region
  17. USGS-US1000G5WH2018-08-09 → 2018-08-12
    Earthquake magnitude 5.6 (mww) in 33.354S 002.482E, depth 10 km at 091653Z aug 18
    South Atlantic Ocean
  18. USGS-US1000G2VT2018-08-03 → 2018-08-06
    Earthquake magnitude 5.8 (mww) in 0.871S 021.996W, depth 10 km at 031850Z aug 18
    Central Mid-atlantic Ridge
  19. USGS-US2000GDSQ2018-07-25 → 2018-07-28
    Earthquake magnitude 5.7 (mww) in 56.062S 027.681W, depth 125 km at 251945Z jul 18
    South Sandwich Islands Region
  20. USGS-US2000GBR32018-07-23 → 2018-07-26
    Earthquake magnitude 6.0 (mww) in 0.299S 019.252W, depth 10 km at 231035Z jul 18
    Central Mid-atlantic Ridge
  21. USGS-US1000F1U82018-06-26 → 2018-06-29
    Earthquake magnitude 5.6 (mww) in 59.535S 029.662W, depth 25 km at 260148Z jun 18
    South Sandwich Islands Region
  22. USGS-US1000EJVV2018-06-06 → 2018-06-09
    Earthquake magnitude 5.6 (mww) in 58.360S 025.756W, depth 31 km at 061851Z jun 18
    South Sandwich Islands Region
  23. USGS-US1000E4VP2018-05-14 → 2018-05-17
    Earthquake magnitude 5.5 (mww) in 55.916S 027.056W, depth 10 km at 141814Z may 18
    South Sandwich Islands Region
  24. USGS-US2000DWPI2018-04-09 → 2018-04-12
    Earthquake magnitude 5.6 (mww) in 57.659S 027.899W, depth 245 km at 090020Z apr 18
    South Sandwich Islands Region
  25. USGS-US1000D5K62018-03-17 → 2018-03-20
    Earthquake magnitude 5.7 (mww) in 47.679S 013.509W, depth 10 km at 170550Z mar 18
    Southern Mid-atlantic Ridge
  26. USGS-US1000D2W02018-03-10 → 2018-03-13
    Earthquake magnitude 5.9 (mww) in 1.423S 015.210W, depth 10 km at 102145Z mar 18
    North of Ascension Island
  27. USGS-US1000D2RU2018-03-10 → 2018-03-13
    Earthquake magnitude 5.5 (mww) in 56.364S 027.864W, depth 10 km at 101427Z mar 18
    South Sandwich Islands Region
  28. USGS-US2000D2JG2018-02-15 → 2018-02-18
    Earthquake magnitude 5.6 (mww) in 0.068S 017.841W, depth 10 km at 150827Z feb 18
    North of Ascension Island
  29. USGS-US2000CQNN2018-01-28 → 2018-01-31
    Earthquake magnitude 6.6 (mww) in 53.062S 009.684E, depth 10 km at 281603Z jan 18
    Southwest of Africa
  30. USGS-US2000CNGH2018-01-23 → 2018-01-26
    Earthquake magnitude 5.6 (mb) in 5.777S 012.543W, depth 10 km at 232309Z jan 18
    Ascension Island Region
  31. USGS-US2000C3Y62017-12-13 → 2017-12-16
    Earthquake magnitude 6.5 (mww) in 54.219S 002.163E, depth 17 km at 131803Z dec 17
    Bouvet Island Region
  32. USGS-US1000BJ7T2017-11-30 → 2017-12-03
    Earthquake magnitude 6.5 (mww) in 1.080S 023.432W, depth 10 km at 300632Z nov 17
    Central Mid-atlantic Ridge
  33. USGS-US2000BVRY2017-11-29 → 2017-12-02
    Earthquake magnitude 5.5 (mww) in 25.643S 013.864W, depth 10 km at 290336Z nov 17
    Southern Mid-atlantic Ridge
  34. USGS-US2000BNNL2017-11-15 → 2017-11-18
    Earthquake magnitude 5.6 (mww) in 59.031S 017.101W, depth 10 km at 150202Z nov 17
    East of the South Sandwich Islands
  35. USGS-US2000BLUL2017-11-11 → 2017-11-14
    Earthquake magnitude 6.1 (mww) in 11.742S 014.114W, depth 10 km at 110036Z nov 17
    Ascension Island Region
  36. USGS-US1000AVUE2017-10-23 → 2017-10-26
    Earthquake magnitude 5.8 (mww) in 52.344S 016.781E, depth 10 km at 230832Z oct 17
    Southwest of Africa
  37. USGS-US1000APZZ2017-10-11 → 2017-10-14
    Earthquake magnitude 5.6 (mww) in 54.259S 008.336E, depth 10 km at 110008Z oct 17
    Bouvet Island Region
  38. USGS-US1000APQL2017-10-10 → 2017-10-13
    Earthquake magnitude 6.7 (mww) in 54.263S 008.609E, depth 9 km at 101853Z oct 17
    Bouvet Island Region
  39. USGS-US2000B25H2017-10-06 → 2017-10-09
    Earthquake magnitude 5.6 (mww) in 35.310S 015.552W, depth 10 km at 061741Z oct 17
    Tristan Da Cunha Region
  40. USGS-US2000APRU2017-09-18 → 2017-09-21
    Earthquake magnitude 5.5 (mww) in 18.546S 012.696W, depth 10 km at 180528Z sep 17
    Southern Mid-atlantic Ridge
  41. USGS-US2000ANJP2017-09-15 → 2017-09-18
    Earthquake magnitude 5.5 (mww) in 55.444S 028.362W, depth 9 km at 151848Z sep 17
    South Sandwich Islands Region
  42. USGS-US2000AFH92017-09-04 → 2017-09-07
    Earthquake magnitude 6.1 (mww) in 57.739S 025.613W, depth 25 km at 040807Z sep 17
    South Sandwich Islands Region
  43. USGS-US2000A98R2017-08-18 → 2017-08-21
    Earthquake magnitude 6.6 (mww) in 1.112S 013.661W, depth 35 km at 180259Z aug 17
    North of Ascension Island
  44. USGS-US2000A6UL2017-08-10 → 2017-08-13
    Earthquake magnitude 5.5 (mww) in 25.009S 013.600W, depth 10 km at 100951Z aug 17
    Southern Mid-atlantic Ridge
  45. USGS-US100098BT2017-07-09 → 2017-07-12
    Earthquake magnitude 5.5 (mww) in 56.070S 027.543W, depth 61 km at 090557Z jul 17
    South Sandwich Islands Region
  46. USGS-US10008WEJ2017-05-30 → 2017-06-02
    Earthquake magnitude 5.7 (mww) in 58.628S 026.242W, depth 76 km at 301129Z may 17
    South Sandwich Islands Region
  47. USGS-US10008RHI2017-05-11 → 2017-05-14
    Earthquake magnitude 5.7 (mww) in 56.584S 025.844W, depth 13 km at 111541Z may 17
    South Sandwich Islands Region
  48. USGS-US10008RD32017-05-11 → 2017-05-14
    Earthquake magnitude 5.6 (mww) in 56.397S 025.787W, depth 10 km at 110109Z may 17
    South Sandwich Islands Region
  49. USGS-US10008RB62017-05-10 → 2017-05-13
    Earthquake magnitude 6.5 (mww) in 56.414S 025.743W, depth 15 km at 102323Z may 17
    South Sandwich Islands Region
  50. USGS-US10008N0I2017-05-02 → 2017-05-05
    Earthquake magnitude 5.9 (mww) in 11.712S 013.938W, depth 10 km at 021510Z may 17
    Ascension Island Region

Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts and your national MSI service.

Earthquake & tsunami bulletins in the South Atlantic Ocean — page 5 · seahazards