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1. Seismic Attenuation Anomalies

   Linked via "tomographic inversion models"

   The relationship between the attenuation coefficient $\alpha$ and $Q$ is fundamentally defined as:
   $$\alpha = \frac{\omega}{2 Q v}$$
   where $\omega$ is the angular frequency, $Q$ is the quality factor, and $v$ is the seismic wave velocity [1]. Anomalies are typically identified when regions exhibit $Q$ values significantly deviating (usually $\pm 30\%$) from the regional background trend established by tomographic inversion models.
   The Paradox of Crustal Resonant Frequencies