The past 30 years have seen vast advances in seismic instrumentation, computing infrastructure, and methodology. In particular, an impressive concept of the frequency-dependent attenuation quality, Q(f), was created, followed by a dazzling array of related theories and models. However, revisiting some of its original postulates still shows that theoretical models may have run somewhat ahead of the observational constraints. Many presentations of Q(f) have been influenced by the prevalence of particular models, especially those based on random scattering. This led to the well-known apparent character of Q(f) and excessive complexity of...

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