Analysis on seismic effect and its mechanism of Changsha well's dynamic ground water level for the MS7.6 Jiji earthquake,Taiwan
JING Shao-qun
WANG Jia-wei
Abstract：While the MS7.6 Jiji earthquake swam on Sept.21,1999 was occurring,the ground water level vibration and leap was recorded by the water level instrument at Changsha well.Based on the power balance principle of well-aquifer system,the me chanism of the water level vibration and leap has been analysed in this paper.Th e results show that the seismic stress wave acted on the aquifers lead to a chan ge of the fluid pressure and effective stress;periodic acting stress wave result ed in water level vibration.The change of the effective pressure make the rock i n bed of the aquifer dilatation and compression,also lead to the grains of rock re-arrangement.Those irreversible and plastic deformation in the course of the d ilatation-compression and rock's grains re-arrangement made the water leve l leap. Among them,the water level leap resulted from the plastic deformation ca n partly recover after earthquake.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 32-37 )