A repeat of a disaster like the Great Lisbon shake of 1755 could lay waste to the coast of Britain and outlying islands, it is feared.
Experts believe such an event would send a 10ft wave of water powering towards the UK.
The tsunami would swamp the tip of Cornwall within a few hours, leaving much of the coast underwater and wiping the Scilly Isles off the map.
Fears of the natural disaster were raised at a meeting of the Devon and Cornwall Local Resilience Forum, which includes police, town planners and emergency services.
Members of the LRF warned that Britain could suffer its own version of the 2004 Boxing Day Tsunami.
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