So were there big earthquakes in the early Bronze Age? According to
   American forensic anthropologist Professor Mike Finnegan, the answer
   is yes. He has examined the skeletons of three men discovered at the
   early Bronze Age site of Numeira near the Dead Sea. From the way their
   bones were broken, he concluded that they were crushed to death -
   possibly because an earthquake brought down a stone tower on top of
   them. Carbon dating put the date of the tower's beams at 2350 BC - the
   early Bronze Age.

-- BBC - History -      Ancient History in depth: The Destruction of.. 


The slippage was one metre
   and 75cm - meaning an earthquake measuring at least a six, on the
   Richter scale.