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Re: Theories on the extinction of dinosaurs



At 07:51 PM 11/14/99 -0800, James R. Cunningham wrote:
>15-20 teratons of TNT.   Think of the blast from a one megaton atomic bomb.  
>Now
>set off 15-20 million of them simultaneously.  How much does it take to send a
>shockwave around the earth?

For an unattenuated shock wave, more than one might think.  The curvature
of the Earth results in much of the energy being dissipated upwards as it
travels around the Earth.  And mountains accentuate this effect locally.
On top of that, much of the *initial* energy from the impact was upwards,
possibly putting some pieces into low Earth orbit.

>  Or look at the Jupiter impactors from a few years
>back that were smaller than the Chixulub impactor (but traveling faster). 

MUCH faster, having been accelerated by Jupiter's far greater gravity.

> They
>put out shockwaves larger than the earth.

In the absence of significant curvature or topographic features to
dissipate them.

--------------
May the peace of God be with you.         sarima@ix.netcom.com