[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: antipodal effects
> I once did some calculations on a 65mybp palaeoglobe (based on the Terra
> Mobilis program) and the land closest to the opposite side of the world to
> Chixalub at that time was Broome, Western Australia. In reference to an
> earlier, similar post by Dave Carlisle, India was some distance from the
> opposite side of the world at that time. Not only was Australia much closer
> to the antipodal impact site, there are no flood basalts of that age in
> that area.
I'm sorry that I have not been following this conversation as I have
been rather busy :-) collecting dinosaurs in Scotland and I will soon be
away again to lecture in France :-#
They way I see it (if this has not already been covered) is that the
impact of an asteroid/comet is unlikely to have an antipodal effect.
It is like a mosquitoe crash landing on a tomato..... might dent the
skin, but doesn't produce an antipodal blip. If the asteroid/comet
was the size of the moon, however, then there might have been an
antipodal effect similar to a marble bouncing off a tomato. Even if
the asteroid/comet penetrated the crust, the effect would be similar
to an earthquake, or a nuclear explosion (more likely as the seismic
waves would be equal in all directions) to form doughnut and circular
shadow zones by refraction (at least that is my guess based on the
internal structure of the Earth).
What do you think David? How wrong am I?