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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01
02
03
04
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06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
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24
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-USB000QVT42014-05-19 → 2014-05-22
    Earthquake magnitude 5.7 (mww) in 57.033S 025.149W, depth 10 km at 192247Z may 14
    South Sandwich Islands Region
  2. USGS-USB000QSZ72014-05-17 → 2014-05-20
    Earthquake magnitude 5.5 (mwb) in 56.245S 027.534W, depth 90 km at 172128Z may 14
    South Sandwich Islands Region
  3. USGS-USB000Q5DT2014-04-30 → 2014-05-03
    Earthquake magnitude 5.7 (mwb) in 1.167S 013.458W, depth 10 km at 301552Z apr 14
    North of Ascension Island
  4. USGS-USB000PKXL2014-04-15 → 2014-04-18
    Earthquake magnitude 6.8 (mww) in 53.497S 008.722E, depth 11 km at 150357Z apr 14
    Bouvet Island Region
  5. USGS-USC000NVS82014-03-29 → 2014-04-01
    Earthquake magnitude 5.9 (mww) in 0.848S 021.920W, depth 12 km at 290746Z mar 14
    Central Mid-atlantic Ridge
  6. USGS-USC000NE4M2014-03-17 → 2014-03-20
    Earthquake magnitude 5.8 (mwb) in 53.168S 032.316W, depth 6 km at 171324Z mar 14
    South Georgia Island Region
  7. USGS-USC000MF4J2014-02-01 → 2014-02-04
    Earthquake magnitude 6.1 (mww) in 56.827S 027.339W, depth 130 km at 010358Z feb 14
    South Sandwich Islands Region
  8. USGS-USC000LTDL2013-12-28 → 2013-12-31
    Earthquake magnitude 5.8 (mww) in 1.367S 015.171W, depth 10 km at 281859Z dec 13
    North of Ascension Island
  9. USGS-USB000L6332013-11-25 → 2013-11-28
    Earthquake magnitude 6.0 (mwc) in 53.871S 053.911W, depth 15 km at 250721Z nov 13
    South Atlantic Ocean
  10. USGS-USB000L5ZN2013-11-25 → 2013-11-28
    Earthquake magnitude 7.0 (mww) in 53.945S 055.003W, depth 12 km at 250627Z nov 13
    Falkland Islands Region
  11. USGS-USB000L5ZB2013-11-25 → 2013-11-28
    Earthquake magnitude 5.6 (mb) in 54.027S 054.980W, depth 10 km at 250627Z nov 13
    South Atlantic Ocean
  12. USGS-USB000L0W22013-11-17 → 2013-11-20
    Earthquake magnitude 5.5 (mb) in 10.329S 011.834W, depth 10 km at 171737Z nov 13
    Ascension Island Region
  13. USGS-USB000KS542013-11-03 → 2013-11-06
    Earthquake magnitude 5.5 (mww) in 57.844S 025.714W, depth 66 km at 031746Z nov 13
    South Sandwich Islands Region
  14. USGS-USC000KMFW2013-10-24 → 2013-10-27
    Earthquake magnitude 6.7 (mww) in 58.153S 012.796W, depth 23 km at 241925Z oct 13
    East of the South Sandwich Islands
  15. USGS-USB000KHL52013-10-20 → 2013-10-23
    Earthquake magnitude 5.6 (mwc) in 56.512S 025.693W, depth 10 km at 201316Z oct 13
    South Sandwich Islands Region
  16. USGS-USC000IQ6F2013-07-26 → 2013-07-29
    Earthquake magnitude 6.3 (mww) in 57.915S 023.841W, depth 13 km at 262132Z jul 13
    South Sandwich Islands Region
  17. USGS-USC000HS0H2013-06-16 → 2013-06-19
    Earthquake magnitude 5.5 (mwb) in 56.280S 027.443W, depth 91 km at 160251Z jun 13
    South Sandwich Islands Region
  18. USGS-USC000HIMM2013-06-07 → 2013-06-10
    Earthquake magnitude 5.6 (mww) in 43.754S 016.182W, depth 7 km at 072013Z jun 13
    Southern Mid-atlantic Ridge
  19. USGS-USB000GWU22013-05-16 → 2013-05-19
    Earthquake magnitude 5.6 (mww) in 57.511S 006.799W, depth 10 km at 160557Z may 13
    Southern Mid-atlantic Ridge
  20. USGS-USC000GTEU2013-05-10 → 2013-05-13
    Earthquake magnitude 5.7 (mww) in 28.983S 013.229W, depth 4 km at 101956Z may 13
    Southern Mid-atlantic Ridge
  21. USGS-USB000GCH72013-04-20 → 2013-04-23
    Earthquake magnitude 5.8 (mww) in 54.780S 001.173E, depth 11 km at 200511Z apr 13
    Bouvet Island Region
  22. USGS-USB000FNL42013-03-19 → 2013-03-22
    Earthquake magnitude 5.9 (mww) in 58.892S 024.331W, depth 20 km at 190328Z mar 13
    South Sandwich Islands Region
  23. USGS-USP000JSAD2012-09-14 → 2012-09-17
    Earthquake magnitude 5.5 (mwc) in 39.676S 016.010W, depth 10 km at 140718Z sep 12
    Southern Mid-atlantic Ridge
  24. USGS-USP000JNCM2012-06-29 → 2012-07-02
    Earthquake magnitude 5.8 (mww) in 24.747S 009.663W, depth 10 km at 291531Z jun 12
    South Atlantic Ocean
  25. USGS-USP000JMPY2012-06-13 → 2012-06-16
    Earthquake magnitude 5.5 (mb) in 55.796S 028.394W, depth 86 km at 130706Z jun 12
    South Sandwich Islands Region
  26. USGS-USP000JK7G2012-05-09 → 2012-05-12
    Earthquake magnitude 5.5 (mww) in 0.966S 013.600W, depth 12 km at 091449Z may 12
    North of Ascension Island
  27. USGS-USP000JJAR2012-04-21 → 2012-04-24
    Earthquake magnitude 5.7 (mwc) in 35.229S 016.181W, depth 10 km at 210119Z apr 12
    Southern Mid-atlantic Ridge
  28. USGS-USP000JJ502012-04-17 → 2012-04-20
    Earthquake magnitude 6.2 (mww) in 59.016S 016.612W, depth 12 km at 171903Z apr 12
    East of the South Sandwich Islands
  29. USGS-USP000JHY72012-04-14 → 2012-04-17
    Earthquake magnitude 6.2 (mww) in 57.679S 065.308W, depth 15 km at 141056Z apr 12
    Drake Passage
  30. USGS-USP000JHFK2012-04-10 → 2012-04-13
    Earthquake magnitude 5.8 (mww) in 1.261S 013.972W, depth 10 km at 100509Z apr 12
    North of Ascension Island
  31. USGS-USP000JF8T2012-02-23 → 2012-02-26
    Earthquake magnitude 5.5 (mwc) in 17.699S 013.193W, depth 10 km at 230508Z feb 12
    Southern Mid-atlantic Ridge
  32. USGS-USP000JEQR2012-02-09 → 2012-02-12
    Earthquake magnitude 5.5 (mwc) in 56.383S 025.816W, depth 10 km at 090849Z feb 12
    South Sandwich Islands Region
  33. USGS-USP000JDXC2012-01-24 → 2012-01-27
    Earthquake magnitude 5.5 (mww) in 56.336S 027.723W, depth 8 km at 241631Z jan 12
    South Sandwich Islands Region
  34. USGS-USP000JDU02012-01-22 → 2012-01-25
    Earthquake magnitude 5.5 (mwc) in 56.655S 024.899W, depth 10 km at 220600Z jan 12
    South Sandwich Islands Region
  35. USGS-USP000JDTY2012-01-22 → 2012-01-25
    Earthquake magnitude 6.0 (mww) in 56.759S 025.147W, depth 13 km at 220553Z jan 12
    South Sandwich Islands Region
  36. USGS-USP000JC2Q2011-12-11 → 2011-12-14
    Earthquake magnitude 6.2 (mww) in 56.009S 028.184W, depth 116 km at 110954Z dec 11
    South Sandwich Islands Region
  37. USGS-USP000JBJX2011-11-29 → 2011-12-02
    Earthquake magnitude 5.9 (mww) in 1.602S 015.450W, depth 10 km at 290030Z nov 11
    North of Ascension Island
  38. USGS-USP000J7GQ2011-09-03 → 2011-09-06
    Earthquake magnitude 6.4 (mww) in 56.451S 026.847W, depth 84 km at 030448Z sep 11
    South Sandwich Islands Region
  39. USGS-USP000J6TH2011-08-21 → 2011-08-24
    Earthquake magnitude 5.6 (mwc) in 56.428S 027.494W, depth 130 km at 211238Z aug 11
    South Sandwich Islands Region
  40. USGS-USP000J6JG2011-08-16 → 2011-08-19
    Earthquake magnitude 5.7 (mww) in 57.229S 025.452W, depth 44 km at 162024Z aug 11
    South Sandwich Islands Region
  41. USGS-USP000J6EN2011-08-14 → 2011-08-17
    Earthquake magnitude 5.6 (mwb) in 1.337S 014.653W, depth 10 km at 140129Z aug 11
    North of Ascension Island
  42. USGS-USP000J69G2011-08-10 → 2011-08-13
    221 km ene of georgetown, saint helena
  43. USGS-USP000J2TQ2011-06-07 → 2011-06-10
    Earthquake magnitude 5.6 (mwc) in 44.176S 016.039W, depth 10 km at 070518Z jun 11
    Southern Mid-atlantic Ridge
  44. USGS-USP000J1X22011-05-21 → 2011-05-24
    Earthquake magnitude 5.9 (mww) in 56.074S 027.110W, depth 48 km at 210016Z may 11
    South Sandwich Islands Region
  45. USGS-USP000J0HA2011-04-24 → 2011-04-27
    Earthquake magnitude 5.6 (mww) in 35.420S 016.958W, depth 10 km at 242244Z apr 11
    Southern Mid-atlantic Ridge
  46. USGS-USP000J0H62011-04-24 → 2011-04-27
    Earthquake magnitude 5.6 (mww) in 35.704S 016.994W, depth 10 km at 242109Z apr 11
    Southern Mid-atlantic Ridge
  47. USGS-USP000HY9A2011-03-22 → 2011-03-25
    Earthquake magnitude 5.8 (mww) in 33.096S 015.977W, depth 5 km at 221331Z mar 11
    Southern Mid-atlantic Ridge
  48. USGS-USP000HVEQ2011-03-06 → 2011-03-09
    Earthquake magnitude 6.5 (mww) in 56.422S 027.063W, depth 88 km at 061432Z mar 11
    South Sandwich Islands Region
  49. USGS-USP000HV6A2011-02-28 → 2011-03-03
    Earthquake magnitude 5.6 (mwc) in 59.233S 017.012W, depth 10 km at 281104Z feb 11
    East of the South Sandwich Islands
  50. USGS-USP000HQND2010-12-08 → 2010-12-11
    Earthquake magnitude 6.3 (mwc) in 56.412S 025.741W, depth 29 km at 080524Z dec 10
    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 — page 7 · seahazards