Not well known, is that in January 1607 an 8m high tsunami swept up the Severn estuary on the South West coast of England, killing about 2,000 people. A plaque in a church marks the high water mark, and reads:
“An inundation of the sea water by overflowing and breaking down the Sea banks; happened in this Parish of Kingstone-Seamore, and many others adjoining; by reason whereof many Persons were drown’d and much Cattle and Goods, were lost: the water in the Church was five feet high and the greatest part lay on the ground about ten days. WILLIAM BOWER”
Never assume that these things happen ‘in other places’. Link. All coasts are vulnerable.