  Crack microgeometries pose a paramount influence on effective elastic
characteristics and sonic responses. Geophysical exploration based on seismic
methods are widely used to assess and understand the presence of fractures.
Numerical simulation as a promising way for this issue, still faces some
challenges. With the rapid development of computers and computational
techniques, discrete-based numerical approaches with desirable properties have
been increasingly developed, but have not yet extensively applied to seismic
response simulation for complex fractured media. For this purpose, we apply the
coupled LSM-DFN model (Liu and Fu, 2020b) to examining the validity in
emulating elastic wave propagation and scattering in naturally-fractured media.
By comparing to the theoretical values, the implement of the schema is
validated with input parameters optimization. Moreover, dynamic elastic moduli
from seismic responses are calculated and compared with static ones from
quasi-static loading of uniaxial compression tests. Numerical results are
consistent with the tendency of theoretical predictions and available
experimental data. It shows the potential for reproducing the seismic responses
in complex fractured media and quantitatively investigating the correlations
and differences between static and dynamic elastic moduli.
