some preparation here.
https://zym8903.wordpress.com/2012/03/13/tat_revisitonstart/
1. The problem is I cannot use 
2. In Isakov’s theorem, I think there must some modification of 
[Claim] I found the problem, Tataru’s estimate assumes that both of P wave and S wave vanishes outside the domain. That is the point.
[Claim] Tataru is right, It should both be zero outside the domain. I have no idea right now.
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