Abstract
Seismic waves contain much information concerning to the physical properties of the medium in and around the source region of an impending large earthquake, where microcracks are believed to be extensively generated in the preparation stage of the event. Theoretical backgrounds and principles of seismic-wave methods for detecting temporal changes of the medium and their applications are reviewed with special attention to inherent problems and directions for future studies. The practical methods are clasified into the following categories: (1) Seismic wave velocity change; (2) Decay rate change of seismic coda waves; (3) Splitting of S waves; (4) Others including seismic spectra change, rectilinearity change of P-waves and so on.
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