In this paper, we would like to characterize nonradiating volume and surface (faulting) sources for the elastic waves in anisotropic inhomogeneous media. Each type of source can be decomposed into a radiating part and a nonradiating part. The radiating part can be uniquely determined by an explicit formula containing the near-field measurements. On the other hand, the nonradiating part does not induce scattered waves at a certain frequency. In other words, such nonradiating source cannot be detected by measuring the field at a single frequency in a region outside of the domain where the source is located.
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Kow et al. (2021) studied this question.