Drake Passage

Why in News?

• On August 21–22, 2025, a 7.5 magnitude earthquake struck the Drake Passage region (initially reported as 8.0 by USGS).
• Tsunami alerts:
  • US Tsunami Warning System: No alert issued.
  • PTWC: Brief tsunami warning for Chile; possible hazardous waves within 3 hours along some Chilean coasts.

Drake Passage — Key Facts

• Location: Between Cape Horn (southernmost tip of South America, Chile) & South Shetland Islands (north of Antarctic Peninsula).
• Geographic role:
  • Connects Southwestern Atlantic Ocean ↔ Southeastern Pacific Ocean.
  • Deep, wide waterway; part of the Antarctic Circumpolar Current (ACC) — strongest ocean current in the world.
• Historical note:
  • Named after Sir Francis Drake (English navigator).
  • First recorded crossing: 1616 by Willem Schouten (Flemish expedition).

Importance

• Geopolitical:
  • Lies near strategic sea routes around Cape Horn.
  • Critical for shipping & naval operations in the Southern Ocean.
• Climate & Science:
  • Regulates heat & salinity exchange between oceans.
  • Key route for Antarctic expeditions & research vessels.
• Natural Hazards:
  • Region prone to strong storms, rough seas, and seismic activity due to tectonic interactions near South Sandwich, Scotia & Antarctic Plates.