Unknown
In:
Geophys. Res. Lett., Tulsa, 450 pp.; 2nd modified and expanded ed., Society of
Exploration Geophysics, vol. 29, no. 17, pp. 846-855, pp. B02405, (ISSN: 1340-4202)
Publication Date:
2002
Description:
Being situated in the immediate vicinity of the 1999 Chichi earthquake
epicenter, 178 automatic-recording monitoring wells of the Choshui fan-delta provided a
very valuable data set for testing whether the coseismic water-level changes in confined
aquifers can be explained as a poroelastic response of well-aquifer systems to coseismic
volumetric strain. This study demonstrates that the polarities of the observed coseismic
water-level and river discharge changes are in good agreement with those of the static
volumetric strain calculated by a dislocation model, using the well-constrained rupture
model of the seismogenic Chelungpu fault. The puzzling "bull-eye" patterns formed by the
equipotential lines of the coseismic water-level changes in the confined aquifers in the
middle parts of the fan-delta represent pressure enhancement due to their being situated
at the pinch-out ends of conglomeratic layers.
Keywords:
Earthquake
;
China
;
Seismology
;
Fluids
;
7299
;
Seismology:
;
General
;
or
;
miscellaneous
;
1899
;
Hydrology:
;
General
;
or
;
miscellaneous
;
1829
;
Groundwater
;
hydrology
;
Chi-Chi
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