berkeman said:
Islands aren't floating on water...
so true!
it would be more correct in saying ... how much energy it takes to destroy an island
you need to look no further than the once existing island of Krakatoa in the Sunda Strait between Java and Sumatera, Indonesia. In 1883 the eruption of the volcano pretty much totally destroyed the island leaving a huge undersea cauldera. Volcanic rebuilding had continued and now we have Anak Krakatau or son (child) of Krakatoa. Its also quite a violent volcano.
The 1883 eruption was huge some 20+ cubic km of material was ejected and the booms of the explosion were heard over 3000km away.
OK after some amount of link following, I found this in wiki...
8×10^17 J = estimated energy released by the eruption of the Indonesian volcano, Krakatoa, in 1883
and to put that into perspective...
2.1×10^17 J = yield of the Tsar Bomb, the largest nuclear weapon ever tested (50 megatons)this guy wrote a good book on the eruption, I read it some years back
not only did he look at the volcano itself but took it into historical context with the local population etc.
Winchester, Simon (2003). Krakatoa: The Day the World Exploded: August 27, 1883. New York: HarperCollins. ISBN 0-06-621285-5.
there are many other references on the www, and surely some one has written about the equivelent amounts of energy released say compared to large nuclear bombs etc
cheers
Dave
