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近畿地方北部で観測された地殻歪の長期的変化

机译：在近畿地区北部观测到的地壳应变的长期变化

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Crustal strain has been observed using borehole-type multi-component strainmeters at Tsuruga and Imazu sta-tions in the northern part of the Kinki district, Japan. We investigated 12.5 years of strain data recorded at these stations starting from 1996. Seasonal strain changes observed at Imazu correlate well with the changes in ground water level observed there. Seasonal strain changes observed at Tsuruga are well described by the output of a tank model with daily precipitation as input. Strain changes corresponding to the initial stabilization of the strainmeters are modeled by expo-nential functions. After seasonal and exponential strain changes are removed, the strain history shows excursions around 2000 and 2005. These cannot be explained by temporal changes in strainmeter sensitivity or long-term variations of precipitation. We calculated expected strain changes at the two stations caused by the slow slip events in the Tokai dis-trict from 2000 to 2005 and found that calculated principal axes of strain are consistent with observations, although the amounts of observed strain are about ten times larger than calculated ones.
机译：在日本近畿地区北部的敦贺站和今津站使用钻孔型多分量应变仪观测到地壳应变。我们从1996年开始调查了这些站记录的12.5年的应变数据。在Imazu观测到的季节性应变变化与那里观测到的地下水位变化密切相关。在敦贺观测到的季节性应变变化可以通过以日降水量为输入的储罐模型的输出很好地描述。对应于应变仪初始稳定度的应变变化通过指数函数建模。去除季节性和指数应变变化后，应变历史显示2000和2005年左右的偏移。这不能用应变计灵敏度的时间变化或降水的长期变化来解释。我们计算了2000年至2005年东海地区慢滑事件引起的两个站点的预期应变变化，发现计算的应变主轴与观测值一致，尽管观测到的应变量比观测值大约十倍。计算的。

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