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Electroweak corrections associated with the instability of the top quark tothe next-to-next-to-leading logarithmic (NNLL) total top pair threshold crosssection in e+e- annihilation are determined. Our method is based on absorptiveparts in electroweak matching conditions of the NRQCD operators and the opticaltheorem. The corrections lead to ultraviolet phase space divergences that haveto be renormalized and lead to NLL mixing effects. Numerically, the correctionscan amount to several percent and are comparable to the known NNLL QCDcorrections.Comment: 17 pages, revtex4, 4 postscript figures included; minor changes in  text and references, title modified in printed versio

Electroweak absorptive parts in the matching conditions of nonrelativistic QCD