行政院國家科學委員會補助專題研究計畫成果報告:地下水觀測站網水位急遽變化與地震發生關連性之先期研究：地震波對地下水觀測井孔隙水壓力學變化

The simplified visco-elastic model is
adopted to describe the earthquake induced
dynamic behavior of the liquid phase from
the interface between the gravels and the
sands to the pin-off in the confined aquifer.
We assume the porous media is undrained
and the liquid phase is compressible in the
sanded confined aquifer during the vibration,
and then decouple the momentum equation
of the liquid phase to find the analytical
solution. The presented model is derived to
match the captured data of the high dense
network of hydrologic monitoring wells after
the Chi-chi earthquake and does fairly well.
Consulting the hydrogeological profiles
identified from the drilled cores, the highest
well water level changes are located at the
interface between the gravels and the sands in
the confined aquifer and induce the
liquefaction at the upstream area in the next
few days. The field observation emphasizes
the importance of the hydrogeological
influences in evaluating the liquefaction
potential.