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
    Earthquake magnitude 6.2 (mww) in 56.206S 027.909W, depth 126 km at 022346Z sep 26
    South Sandwich Islands Region

Longest in force

  1. USGS-US7000TDRVin force2026-09-02 · 0 d
    Earthquake magnitude 6.2 (mww) in 56.206S 027.909W, depth 126 km at 022346Z sep 26
    South Sandwich Islands Region

By year

97
98
99
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

By month (all years)

J
F
M
A
M
J
J
A
S
O
N
D

Other hazards in the South Atlantic Ocean

Archive · 582 cancelled

  1. USGS-US7000T0NG2026-07-15 → 2026-07-18
    Earthquake magnitude 5.5 (mww) in 59.967S 018.990W, depth 15 km at 151451Z jul 26
    East of the South Sandwich Islands
  2. USGS-US7000SZPB2026-07-11 → 2026-07-14
    Earthquake magnitude 6.4 (mww) in 55.535S 028.911W, depth 26 km at 111026Z jul 26
    South Sandwich Islands Region
  3. USGS-US6000TAKD2026-07-07 → 2026-07-10
    297 km sse of ushuaia, argentina
  4. USGS-US7000SUSV2026-06-20 → 2026-06-23
    147 km ne of georgetown, saint helena
  5. USGS-US7000STTI2026-06-17 → 2026-06-20
    Earthquake magnitude 6.6 (mww) in 0.584S 020.048W, depth 10 km at 171856Z jun 26
    Central Mid-atlantic Ridge
  6. USGS-US7000SRGZ2026-06-08 → 2026-06-11
    Earthquake magnitude 5.9 (mww) in 55.773S 004.344W, depth 10 km at 081420Z jun 26
    Southern Mid-atlantic Ridge
  7. USGS-US6000SZ3X2026-05-20 → 2026-05-23
    Earthquake magnitude 5.7 (mww) in 56.112S 027.877W, depth 101 km at 202300Z may 26
    South Sandwich Islands Region
  8. USGS-US6000S9II2026-02-16 → 2026-02-19
    Earthquake magnitude 5.5 (mww) in 17.746S 013.187W, depth 10 km at 161732Z feb 26
    Southern Mid-atlantic Ridge
  9. USGS-US6000S9I02026-02-16 → 2026-02-19
    Earthquake magnitude 5.7 (mww) in 57.911S 025.352W, depth 27 km at 161452Z feb 26
    South Sandwich Islands Region
  10. USGS-US6000S55S2026-01-29 → 2026-02-01
    Earthquake magnitude 6.0 (mww) in 57.772S 025.599W, depth 64 km at 290730Z jan 26
    South Sandwich Islands Region
  11. USGS-US7000RS1T2026-01-26 → 2026-01-29
    Earthquake magnitude 5.8 (mww) in 35.461S 017.360W, depth 10 km at 260249Z jan 26
    Southern Mid-atlantic Ridge
  12. USGS-US6000RVHE2025-12-17 → 2025-12-20
    Earthquake magnitude 5.6 (mww) in 58.664S 025.223W, depth 35 km at 171705Z dec 25
    South Sandwich Islands Region
  13. USGS-US6000RTG82025-12-08 → 2025-12-11
    Earthquake magnitude 5.5 (mb) in 58.801S 025.488W, depth 30 km at 081841Z dec 25
    South Sandwich Islands Region
  14. USGS-US6000RLS22025-11-05 → 2025-11-08
    Earthquake magnitude 5.6 (mww) in 57.963S 025.221W, depth 23 km at 052203Z nov 25
    South Sandwich Islands Region
  15. USGS-US6000RK4F2025-10-29 → 2025-11-01
    Earthquake magnitude 5.5 (mww) in 47.205S 012.216W, depth 10 km at 290616Z oct 25
    Southern Mid-atlantic Ridge
  16. USGS-US6000RHF22025-10-16 → 2025-10-19
    Earthquake magnitude 6.3 (mww) in 59.966S 061.865W, depth 8 km at 160142Z oct 25
    Drake Passage
  17. USGS-US6000RGK92025-10-11 → 2025-10-14
    Earthquake magnitude 5.6 (mb) in 56.267S 026.436W, depth 45 km at 111307Z oct 25
    South Sandwich Islands Region
  18. USGS-US6000RGIL2025-10-11 → 2025-10-14
    Earthquake magnitude 5.5 (mb) in 56.200S 026.389W, depth 51 km at 110806Z oct 25
    South Sandwich Islands Region
  19. USGS-US6000RFJC2025-10-08 → 2025-10-11
    Earthquake magnitude 5.6 (mww) in 57.744S 024.268W, depth 10 km at 080350Z oct 25
    South Sandwich Islands Region
  20. USGS-US7000QVRF2025-09-12 → 2025-09-15
    Earthquake magnitude 5.6 (mww) in 39.434S 015.621W, depth 10 km at 121746Z sep 25
    Tristan Da Cunha Region
  21. USGS-US7000QSU52025-08-31 → 2025-09-03
    Earthquake magnitude 5.6 (mww) in 58.376S 025.620W, depth 67 km at 311624Z aug 25
    South Sandwich Islands Region
  22. USGS-US6000QWEX2025-07-30 → 2025-08-02
    Earthquake magnitude 5.5 (mb) in 58.926S 026.203W, depth 126 km at 300924Z jul 25
    South Sandwich Islands Region
  23. USGS-US7000Q8TW2025-06-25 → 2025-06-28
    Earthquake magnitude 6.2 (mww) in 35.722S 017.044W, depth 10 km at 252216Z jun 25
    Southern Mid-atlantic Ridge
  24. USGS-US6000QJA62025-06-10 → 2025-06-13
    Earthquake magnitude 5.6 (mww) in 55.352S 028.038W, depth 12 km at 100407Z jun 25
    South Sandwich Islands Region
  25. USGS-US6000QGTS2025-05-30 → 2025-06-02
    Earthquake magnitude 6.2 (mww) in 53.284S 009.105E, depth 10 km at 300536Z may 25
    Southwest of Africa
  26. USGS-US7000PWPU2025-05-02 → 2025-05-05
    289 km sse of ushuaia, argentina
  27. USGS-US7000PWKZ2025-05-02 → 2025-05-05
    278 km sse of ushuaia, argentina
  28. USGS-US6000Q6FI2025-04-16 → 2025-04-19
    Earthquake magnitude 5.6 (mww) in 32.483S 014.272W, depth 10 km at 161241Z apr 25
    Southern Mid-atlantic Ridge
  29. USGS-US6000Q48H2025-04-05 → 2025-04-08
    Earthquake magnitude 5.6 (mb) in 57.244S 025.508W, depth 25 km at 051132Z apr 25
    South Sandwich Islands Region
  30. USGS-US6000Q48D2025-04-05 → 2025-04-08
    Earthquake magnitude 5.5 (mww) in 57.267S 025.624W, depth 28 km at 051129Z apr 25
    South Sandwich Islands Region
  31. USGS-US7000PMXP2025-03-27 → 2025-03-30
    Earthquake magnitude 5.7 (mww) in 56.193S 027.426W, depth 124 km at 270041Z mar 25
    South Sandwich Islands Region
  32. USGS-US6000PZNK2025-03-18 → 2025-03-21
    Earthquake magnitude 5.6 (mww) in 55.378S 028.905W, depth 37 km at 182252Z mar 25
    South Sandwich Islands Region
  33. USGS-US6000PYXV2025-03-14 → 2025-03-17
    Earthquake magnitude 5.9 (mww) in 55.818S 027.070W, depth 13 km at 142342Z mar 25
    South Sandwich Islands Region
  34. USGS-US6000PLDH2025-01-21 → 2025-01-24
    Earthquake magnitude 5.5 (mww) in 27.520S 013.423W, depth 10 km at 210605Z jan 25
    Southern Mid-atlantic Ridge
  35. USGS-US6000PHCE2025-01-03 → 2025-01-06
    Earthquake magnitude 5.5 (mww) in 58.770S 025.958W, depth 86 km at 030233Z jan 25
    South Sandwich Islands Region
  36. USGS-US6000PGV42025-01-01 → 2025-01-04
    Earthquake magnitude 6.1 (mww) in 56.410S 026.706W, depth 70 km at 011348Z jan 25
    South Sandwich Islands Region
  37. USGS-US6000PG432024-12-28 → 2024-12-31
    Earthquake magnitude 5.6 (mww) in 52.126S 004.849W, depth 10 km at 280834Z dec 24
    Southern Mid-atlantic Ridge
  38. USGS-US7000NWWP2024-12-07 → 2024-12-10
    Earthquake magnitude 5.9 (mww) in 40.356S 016.755W, depth 10 km at 071731Z dec 24
    Southern Mid-atlantic Ridge
  39. USGS-US7000NCZ62024-09-10 → 2024-09-13
    Earthquake magnitude 5.7 (mb) in 55.871S 026.174W, depth 10 km at 102350Z sep 24
    South Sandwich Islands Region
  40. USGS-US6000NI0G2024-08-04 → 2024-08-07
    Earthquake magnitude 5.5 (mww) in 0.159S 018.313W, depth 10 km at 040543Z aug 24
    Central Mid-atlantic Ridge
  41. USGS-US6000N96V2024-06-29 → 2024-07-02
    Earthquake magnitude 5.6 (mww) in 54.063S 007.230E, depth 10 km at 291638Z jun 24
    Bouvet Island Region
  42. USGS-US7000MSC32024-06-14 → 2024-06-17
    Earthquake magnitude 5.9 (mww) in 31.190S 013.319W, depth 10 km at 140951Z jun 24
    Southern Mid-atlantic Ridge
  43. USGS-US7000MSB02024-06-14 → 2024-06-17
    Earthquake magnitude 5.9 (mww) in 30.940S 013.472W, depth 10 km at 140426Z jun 24
    Southern Mid-atlantic Ridge
  44. USGS-US7000MQTV2024-06-06 → 2024-06-09
    Earthquake magnitude 5.7 (mww) in 55.276S 029.179W, depth 35 km at 062258Z jun 24
    South Sandwich Islands Region
  45. USGS-US7000MQGH2024-06-05 → 2024-06-08
    Earthquake magnitude 5.5 (mww) in 59.669S 029.589W, depth 11 km at 051039Z jun 24
    South Sandwich Islands Region
  46. USGS-US7000MP5R2024-05-31 → 2024-06-03
    Earthquake magnitude 5.6 (mww) in 59.551S 026.274W, depth 36 km at 310835Z may 24
    South Sandwich Islands Region
  47. USGS-US6000MWYT2024-05-07 → 2024-05-10
    Earthquake magnitude 5.6 (mww) in 59.450S 017.908W, depth 10 km at 071434Z may 24
    East of the South Sandwich Islands
  48. USGS-US6000MV762024-04-30 → 2024-05-03
    Earthquake magnitude 5.5 (mww) in 55.710S 027.020W, depth 11 km at 301430Z apr 24
    South Sandwich Islands Region
  49. USGS-US6000MJX02024-03-20 → 2024-03-23
    Earthquake magnitude 5.6 (mww) in 56.252S 027.259W, depth 89 km at 200548Z mar 24
    South Sandwich Islands Region
  50. USGS-US7000LZ2V2024-02-14 → 2024-02-17
    Earthquake magnitude 5.7 (mww) in 58.285S 025.027W, depth 23 km at 140430Z feb 24
    South Sandwich Islands 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 · seahazards