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Re: List of Megatonic impact events of the last two centuries (from George Zay)

In a message dated 97-03-12 19:02:35 EST, you write:

<< I have a question. I am a little lacking in impact terminology, and need 
 more info. What is the percise definition of Megatonic? Does it describe 
 magnitude of a blast within a range a values? Or is it a designation for 
 any bolide impact resulting in some sort of terrestrial destruction, 
 devistation, and catastrophe? Also I would like to have a reference to 
 where it is defined, as I would be very interested in reading more about 
 such a topic. Thanks for your help.
 Frank Stroik