Changes in the permeability of a fault zone are dependent upon the
frequency of seismic waves, and is an important phenomenon whose
mechanisms have not be completely elucidated to date. In this study, the
tidal response of water level in well Chuan06 was considered as an
indicator of the permeability of the fault zone, and the sensitivity of
permeability changes to earthquakes with different epicentral distances
were investigated. The results suggested that the permeability change
induced by seismic waves is frequency dependent. In addition, based on
the mechanisms of permeability changes induced by the seismic waves, the
difference in sensitivity may be attributed to the different sizes of
the fractures in the fault zone. These findings are likely to contribute
to an understanding of hydrogeological responses and seismic activity
induced by the earthquakes.