To prevent serious problems occurring in abandoned mines such as ground
subsidence, it is commonly carried out to fill cavities with some
materials. During or after the cavity-filling process, we need to
monitor distribution of filling materials in abandoned mines. Various
geophysical methods, such as microgravity, electrical resistivity,
ground penetrating radar, and seismic methods, have been used to
describe abandoned mines themselves or to monitor distribution of
filling materials. Microgravity, electrical resistivity, ground
penetrating radar, and microseismic methods can be used to detect
cavities, but may have some limitation in monitoring material
distributions. In this study, we apply the seismic reflection method to
image distribution of filling materials in near-surface abandoned mines.
As the imaging methods, we use full waveform inversion and reverse time
migration. In addition, we apply seismic interferometry to obtain better
results. The full waveform inversion and reverse time migration methods
are applied to four models which can mainly appear in abandoned mines.
Through numerical examples, we investigate feasibility of seismic
reflection method for describing filling material distribution in
abandoned mine. Acknowledgements This work was supported by the National
Research Foundation of Korea (NRF) grant funded by the Korea government
(MSIT) (No. 2017R1A2B4002031) and by the project funded by the Ministry
of Oceans and Fisheries, Korea (D11603317H480000112).