Trend of ambient seismic noise attenuation tomography: Theory and applications.

This document explores the extraction of attenuation structure from ambient noise in seismic data. It provides an overview of the data preprocessing methods used to remove non-stationary signals and ensure energy distribution across frequency bands. The document also highlights theoretical challenges and areas for future investigation, including the impact of inhomogeneous noise source distribution and the validity of using only the fundamental mode in attenuation models. Overall, this research field shows promise for high-resolution imaging without the need for earthquake events. [Extracted from the article]