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    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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