On Sun, Mar 21, 2004 at 03:27:44PM +0000, Benedict Adamson wrote:
> If the bat is ~1000m long it has a mass of ~10^9 kg. If it falls from a
> height of ~100m, its crash has an energy ~10^12 J. That is, ~1000 tonnes
> of TNT. Most of the energy wound be directed downwards: enough for a
> substantial local earthquake? If so, I don't think we want the crash
> close to the defences.
I believe that amount corresponds to the energy release from about a
4.8.