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
Longest in force
By month (all years)
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Other hazards in the South Atlantic Ocean
Archive · 582 cancelled
- USGS-USP0008VXX1998-10-03 → 1998-10-06Earthquake magnitude 5.7 (mwc) in 56.705S 025.571W, depth 33 km at 031512Z oct 98South Sandwich Islands Region
- USGS-USP0008VX91998-10-03 → 1998-10-06Earthquake magnitude 5.6 (mwc) in 56.649S 025.294W, depth 33 km at 030712Z oct 98South Sandwich Islands Region
- USGS-USP0008VX81998-10-03 → 1998-10-06Earthquake magnitude 5.8 (mwc) in 56.618S 025.352W, depth 33 km at 030648Z oct 98South Sandwich Islands Region
- USGS-USP0008VWR1998-10-03 → 1998-10-06Earthquake magnitude 5.5 (mwc) in 56.628S 025.502W, depth 33 km at 030113Z oct 98South Sandwich Islands Region
- USGS-USP0008U7F1998-09-01 → 1998-09-04Earthquake magnitude 5.6 (mwc) in 58.206S 026.533W, depth 152 km at 011029Z sep 98South Sandwich Islands Region
- USGS-USP0008U1M1998-08-29 → 1998-09-01Earthquake magnitude 6.0 (mwc) in 55.737S 027.045W, depth 33 km at 290830Z aug 98South Sandwich Islands Region
- USGS-USP0008T691998-08-13 → 1998-08-16Earthquake magnitude 5.5 (mwc) in 58.786S 024.875W, depth 33 km at 130554Z aug 98South Sandwich Islands Region
- USGS-USP0008QDM1998-06-24 → 1998-06-27Earthquake magnitude 6.0 (mwc) in 37.295S 017.391W, depth 10 km at 241044Z jun 98Southern Mid-atlantic Ridge
- USGS-USP0008QC21998-06-23 → 1998-06-26Earthquake magnitude 5.6 (mwc) in 58.358S 013.792W, depth 10 km at 231436Z jun 98East of the South Sandwich Islands
- USGS-USP0008Q2E1998-06-18 → 1998-06-21Earthquake magnitude 6.3 (mwc) in 11.572S 013.894W, depth 10 km at 180417Z jun 98Ascension Island Region
- USGS-USP0008KXG1998-04-25 → 1998-04-28Earthquake magnitude 6.3 (mwc) in 35.266S 017.326W, depth 10 km at 250607Z apr 98Southern Mid-atlantic Ridge
- USGS-USP0008JUB1998-04-10 → 1998-04-13Earthquake magnitude 6.2 (mwb) in 1.322S 015.651W, depth 10 km at 101640Z apr 98North of Ascension Island
- USGS-USP0008J6U1998-03-29 → 1998-04-01Earthquake magnitude 6.1 (mwc) in 0.239S 017.932W, depth 10 km at 290714Z mar 98North of Ascension Island
- USGS-USP0008J3A1998-03-27 → 1998-03-30Earthquake magnitude 5.7 (mwc) in 58.733S 025.380W, depth 33 km at 270030Z mar 98South Sandwich Islands Region
- USGS-USP0008EMZ1998-01-19 → 1998-01-22Earthquake magnitude 5.7 (mwc) in 0.653S 020.109W, depth 10 km at 191230Z jan 98Central Mid-atlantic Ridge
- USGS-USP0008E861998-01-13 → 1998-01-16Earthquake magnitude 5.5 (mwc) in 55.517S 028.199W, depth 33 km at 130849Z jan 98South Sandwich Islands Region
- USGS-USP0008DP61998-01-03 → 1998-01-06Earthquake magnitude 6.3 (mwc) in 35.474S 016.191W, depth 10 km at 030610Z jan 98Southern Mid-atlantic Ridge
- USGS-USP0008DAA1997-12-27 → 1997-12-30Earthquake magnitude 6.2 (mwc) in 55.783S 004.218W, depth 10 km at 272011Z dec 97Southern Mid-atlantic Ridge
- USGS-USP0008CM51997-12-14 → 1997-12-17Earthquake magnitude 5.7 (mwc) in 59.574S 026.186W, depth 33 km at 140239Z dec 97South Sandwich Islands Region
- USGS-USP0008B0U1997-11-20 → 1997-11-23Earthquake magnitude 5.5 (mwc) in 59.057S 025.511W, depth 33 km at 200608Z nov 97South Sandwich Islands Region
- USGS-USP00088Q51997-10-07 → 1997-10-10Earthquake magnitude 5.5 (mwc) in 52.117S 015.166E, depth 10 km at 071753Z oct 97Southwest of Africa
- USGS-USP00088KN1997-10-05 → 1997-10-08Earthquake magnitude 6.3 (mwc) in 59.739S 029.198W, depth 274 km at 051804Z oct 97South Sandwich Islands Region
- USGS-USP00087D31997-09-11 → 1997-09-14Earthquake magnitude 5.5 (mwc) in 59.053S 016.665W, depth 10 km at 110047Z sep 97East of the South Sandwich Islands
- USGS-USP00087D01997-09-10 → 1997-09-13Earthquake magnitude 5.6 (mwc) in 52.905S 019.715E, depth 10 km at 102229Z sep 97Southwest of Africa
- USGS-USP000870D1997-09-01 → 1997-09-04Earthquake magnitude 5.6 (mwc) in 1.590S 015.572W, depth 10 km at 011236Z sep 97North of Ascension Island
- USGS-USP00086QH1997-08-26 → 1997-08-29Earthquake magnitude 5.6 (mwc) in 58.294S 025.332W, depth 33 km at 260327Z aug 97South Sandwich Islands Region
- USGS-USP00085SE1997-08-04 → 1997-08-07Earthquake magnitude 5.6 (mwc) in 42.790S 016.117W, depth 10 km at 040904Z aug 97Southern Mid-atlantic Ridge
- USGS-USP00084B91997-07-04 → 1997-07-07Earthquake magnitude 5.5 (mwc) in 58.055S 011.180W, depth 10 km at 040954Z jul 97East of the South Sandwich Islands
- USGS-USP00083361997-06-02 → 1997-06-05Earthquake magnitude 6.1 (mwc) in 57.776S 025.466W, depth 33 km at 022124Z jun 97South Sandwich Islands Region
- USGS-USP00082ZT1997-05-30 → 1997-06-02Earthquake magnitude 5.6 (mwc) in 54.096S 006.049E, depth 10 km at 302035Z may 97Bouvet Island Region
- USGS-USP00081801997-04-25 → 1997-04-28Earthquake magnitude 5.8 (mwc) in 48.342S 010.040W, depth 10 km at 250911Z apr 97Southern Mid-atlantic Ridge
- USGS-USP0007VZY1997-01-17 → 1997-01-20Earthquake magnitude 5.8 (mwc) in 47.416S 013.451W, depth 10 km at 172324Z jan 97Southern Mid-atlantic Ridge
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.