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\section{Acknowledgments}
This paper is the result of a year-long email correspondence. Its
outline was created when the first author visited Colorado
School of Mines.  We acknowledge the support of the Stanford
Exploration Project and the Center for Wave Phenomena (CWP) Consortium
Project. The second author was also supported by the United States
Department of Energy (Award \#DE-FG03-98ER14908). We thank Ken Larner
and Petr J\'{\i}lek for reviewing the manuscript, and Ilya Tsvankin 
and other members of the A(nisotropy)-team for insightful discussions.