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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50194

Title: Impacts of hydrogeological characteristics on groundwater-level changes induced by earthquakes
Authors: Ching-Yi Liu Yeeping Chia Po-Yu Chuang Yung-Chia Chiu Tai-Lin Tseng
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Groundwater level
Hydraulic conductivity
Numerical modeling
Date: 2018-03
Issue Date: 2018-09-20T03:16:39Z
Publisher: Hydrogeology Journal
Abstract: Abstract: Changes in groundwater level during earthquakes have been reported worldwide. In this study, field observations of co-seismic groundwater-level changes in wells under different aquifer conditions and sampling intervals due to near-field earthquake events in Taiwan are presented. Sustained changes, usually observed immediately after earthquakes, are found in the confined aquifer. Oscillatory changes due to the dynamic strain triggered by passing earthquake waves can only be recorded by a high-frequency data logger. While co-seismic changes recover rapidly in an unconfined aquifer, they can sustain for months or longer in a confined aquifer. Three monitoring wells with long-term groundwater-level data were examined to understand the association of co-seismic changes with local hydrogeological conditions. The finite element software ABAQUS is used to simulate the pore-pressure changes induced by the displacements due to fault rupture. The calculated co-seismic change in pore pressure is related to the compressibility of the formation. The recovery rate of the change is rapid in the unconfined aquifer due to the hydrostatic condition at the water table, but slow in the confined aquifer due to the less permeable confining layer. Fracturing of the confining layer during earthquakes may enhance the dissipation of pore pressure and induce the discharge of the confined aquifer. The study results indicated that aquifer characteristics play an important role in determining groundwater-level changes during and after earthquakes.
Relation: 26(2) pp.451–465
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50194
Appears in Collections:[應用地球科學研究所] 期刊論文

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