http://scholars.ntou.edu.tw/handle/123456789/24050
標題: | Temporal Variation and Spatial Distribution of Groundwater Level Changes Induced by Large Earthquakes | 作者: | Ching-Yi Liu Yeeping Chia Po-Yu Chung Tsai-Ping Lee Yung-Chia Chiu |
關鍵字: | coseismic;groundwater;earthquake;deformation;sustained changes;post-seismic;high-frequency monitoring | 公開日期: | 一月-2023 | 出版社: | MDPI | 卷: | 15 | 期: | 2 | 起(迄)頁: | 357 | 來源出版物: | Water | 摘要: | Sustained coseismic changes in groundwater level due to static strain during earthquakes could be considered as an indicator of crustal deformation. These changes usually occur abruptly but recover slowly after earthquakes. High-frequency data indicate a time lag between the coseismic change of well water levels and that of the groundwater levels in the aquifer. Abnormal post-seismic changes in groundwater level were observed, possibly caused by cross-formation flow, fracturing, or strain relief. Although sustained changes are generally induced by a local earthquake, they could also be triggered by a distant large earthquake that has occurred at the same tectonic plate. The magnitude and polarity of coseismic changes may vary in wells of different depths at multiple-well stations, revealing additional information about the complexity of crustal deformation in the subsurface. Coseismic falls dominated near the ruptured seismogenic fault during the 1999 M7.6 earthquake, which implied crustal extension adjacent to the thrust fault. However, coseismic rises prevail in most areas, suggesting that crustal compression caused by plate convergence plays a major role on the island of Taiwan during earthquakes. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/24050 | DOI: | https://doi.org/10.3390/w15020357 |
顯示於: | 地球科學研究所 |
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