Abstract
S U M M A R Y This note points out that the statement in ‘A new moment-tensor decomposition for seismic events in anisotropic media’ by Chapman and Leaney that ‘this interpretation is always possible for any moment tensor whatever the anisotropy’ needs qualification. The statement is true for isotropic and weakly anisotropic media, but the decomposition is not possible for all anisotropies, and for some anisotropies and moment tensors is possible but non-unique. However, it is possible for most expected anisotropies. Conditions when the statement is invalid are discussed, and examples of realistic anisotropy are given for which the statement is valid.
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