Quakes
Earthquake magnitude 5.5 (mww) in 17.896S 013.408W, depth 10 km at 132015Z aug 21
Southern Mid-atlantic Ridge · USGS-US6000F74G
- issued
- 2021-08-13 20:15Z
- status
- cancelled 2021-08-16 20:15Z
- self-cancels
- 2021-08-16 20:15Z
- authority
- USGS NEIC
- sea
- South Atlantic Ocean
- position
- -17.896, -13.408
- source
- usgs · first seen 2026-09-03 15:13Z
Original warning text
SOUTHERN MID-ATLANTIC RIDGE. 1. EARTHQUAKE MAGNITUDE 5.5 (MWW) IN 17.896S 013.408W, DEPTH 10 KM AT 132015Z AUG 21. 2. USGS EVENT US6000F74G. https://earthquake.usgs.gov/earthquakes/eventpage/us6000f74g
This area · earthquake & tsunami bulletins
8 within 180 nm since 2002 · 1 in the last 12 months · 0 in force now
02
05
10
15
20
25
26
- Earthquake magnitude 5.5 (mww) in 17.746S 013.187W, depth 10 km at 161732Z feb 262026-02-16
- Earthquake magnitude 6.0 (mww) in 15.807S 013.036W, depth 10 km at 101958Z jun 202020-06-10
- Earthquake magnitude 5.5 (mww) in 18.546S 012.696W, depth 10 km at 180528Z sep 172017-09-18
- Earthquake magnitude 6.3 (mww) in 16.855S 014.171W, depth 10 km at 240453Z may 152015-05-24
- Earthquake magnitude 5.5 (mwc) in 17.699S 013.193W, depth 10 km at 230508Z feb 122012-02-23
- Earthquake magnitude 5.8 (mwb) in 15.592S 013.351W, depth 10 km at 231638Z jul 032003-07-23
Season · when earthquake & tsunami bulletins happen here
J
F
M
A
M
J
J
A
S
O
N
D
month of issue, all years in the archive
Nearby now · within 120 nm
Nothing else in force within 120 nm.
Worldwide now
5 earthquake & tsunami bulletins in force · see all
Quakes
Undersea earthquakes of magnitude 5.5 and above (USGS) and the tsunami bulletins NAVAREA coordinators relay. All current earthquake & tsunami bulletins →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.