A permeability-change model for water-level changes triggered by teleseismic waves
A permeability-change model for water-level changes triggered by teleseismic waves
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DOI：
10.1111/j.1468-8123.2011.00341.x
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发表时间：
2011-08
期刊：
影响因子：
1.7
通讯作者：
Z. Geballe;Chi‐yuen Wang;M. Manga
中科院分区：
文献类型：
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作者：
Z. Geballe;Chi‐yuen Wang;M. Manga
虽然已报道了许多由远震波引起的水文变化，但造成这些变化的机制通常尚不清楚。地震应变引起的渗透率变化常被用来解释水位的变化。利用2008年汶川地震后台湾地区的水位数据，我们发现这些观测结果不能用先前提出的地震后渗透率变化模型来解释。需要一个新的模型，其中地震后渗透率随时间呈指数下降，时间常数<3 min，这比早期研究推断的时间明显短。这一结果可能对孔隙密封机制具有重要意义。
Although many hydrologic changes induced by teleseismic waves have been reported, the mechanism(s) responsible for the changes are usually not known. Permeability changes induced by seismic strains are often invoked to explain changes in water level. Using water-level data in Taiwan after the 2008 Wenchuan earthquake, we show here that the observations cannot be properly explained by previously proposed models of postseismic permeability changes. A new model is required in which the postseismic permeability decreases exponentially as a function of time, with a time constant of <3 min, which is appreciably shorter than inferred from earlier studies. The result may have important implications for pore-sealing mechanism(s).