Physics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29q...5l&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 17, pp. 5-1, CiteID 1824, DOI 10.1029/2002GL015116
Physics
5
Hydrology: General Or Miscellaneous, Seismology: General Or Miscellaneous, Hydrology: Groundwater Hydrology
Scientific paper
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.
Chang Yen-Ming
Lee Min
Liu Tsung-Kwei
Ma Kuo-Fong
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