In late May, 526 AD, an earthquake struck in Syria and Antioch, which were then part of the Byzantine empire. The quake caused the port of Seleucia Pieria to rise up by nearly one meter, resulting in the silting of the harbor. It was the 3rd deadliest earthquake of all time. The quake is estimated to have been over 7 on the Richter scale (VIII on the Mercalli scale). After the earthquake a fire broke out which razed all buildings that had not already been destroyed.
GALVESTON HURRICANE - the worst natural disaster in US history - 8,000 died from lack of a storm tracking system, and some way to warn people. Galveston, an island, was cut off from the mainland, trapping everyone.