Ancient Earthquakes THEORIES ABOUND ON WHAT BROUGHT DOWN THE CIVILIZATIONS OF THE BRONZE AGE. SOME SAY THAT NATIONS WITH IRON SWORDS BESTED THE NATIONS WITH BRONZE SHIELDS. SOME SAY THAT A GREAT CIVILIZATION CAME FROM THE SEA TO CONQUER THEM. THE BIBLE EVEN HAS A THEORY--JOSHUA BLEW A HORN AND THE WALLS OF JERICHO CAME TUMBLING DOWN. THE FACT IS THAT AROUND 1200 BC, NUMEROUS CITIES AROUND THE MEDITTERANEAN COLLAPSED OVER THE PERIOD OF 50 YEARS AND NO ONE IS QUITE SURE WHY. NOW AMOS NUR IS A THROWING A NEW THEORY INTO THE RING. (Sfx: earthquake) Nur: "Earthquakes" NOT JUST ONE EARTHQUAKE, BUT A STORM OF THEM OVER 50 YEARS, SWEEPING FROM SOUTHERN ITALY TO CENTRAL TURKEY. NUR IS A PHYSICIST AT STANFORD UNIVERSITY AND HE SAYS THAT MORE AND MORE, GEOLOGISTS BELIEVE THAT EARTHQUAKES SOMETIMES COME IN BURSTS. TO LOOK FOR EVIDENCE, NUR COLLECTED DATA FROM THE LAST 100 YEARS AROUND THE MEDITTERANEAN. Nur: "What we know today from plate tectonics and modern measurements of earthquakes form the last 50 years or so is that earthquakes. . happen in these swarms or these storms , so we may have a period of 50 years or so in which many large earthquakes happen along many of the plate boundaries and then everything quiets down." NUR SAYS THAT THE BURSTS THIS CENTURY CAME IN THE SAME SITES WHERE WE SEE RUINS OF BRONZE AGE CITIES TODAY, SO IT'S EASY TO BELIEVE THAT A BURST OF EARTHQUAKES ZIPPED THROUGH THE AREA 3000 YEARS AGO. OF COURSE, NUR DOESN'T THINK THAT ONLY THE EARTHQUAKES WERE RESPONSIBLE. THEY WERE JUST THE STARTING POINT. Nur: "The earthquakes provided the vulnerability of these economic and military centers to attack. That's probably how it happened."