Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 46. All Union Symposium U2 on "Instability within the Earth and Core Dynamics" was held on Thursday, August 20 and Friday, August 21, 1987 in Vancouver, Canada as part of the XIX General Assembly of the International Union of Geodesy and Geophysics. The Symposium was convened and organized by Raym…