A tidal wave of grief
Most victims of the 1755 Lisbon earthquake — which convinced Voltaire there could be no God — perished not in the six-minute tremor, but in the tsunamis which foamed up the Tagus soon after, causing devastation as far away as Brazil. These towering sheets of water can have an impact greater than that of a nuclear explosion. The most powerful earthquake yet recorded, in 1960 off Chile, sent 80-foot waves across 10,500 miles of ocean — and struck Japan, half a world away, killing 142 people there. Japan is a magnet for super-tsunamis, which recur at intervals of 800 to 1,000 years, with lesser waves striking the north-east Sanriku coast