Other triggers?
OK so the Canary Island landslide hypothesis has been debunked: it ain't gonna happen. But what about other possible causes? A large earthquake can also cause a tsunami, as Cornwall discovered in 1755 when they suffered "great loss of life and property" in the tsunami caused by the Lisbon earthquake. That same tsunami also destroyed some of the city wall in Galway, Ireland.
Biting the hand that feeds IT
