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首页> 外文期刊>Journal of geodynamics >Comparison of tidal strain changes observed at the borehole array observation system with in situ rock properties in the Tono region, central Japan
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Comparison of tidal strain changes observed at the borehole array observation system with in situ rock properties in the Tono region, central Japan

机译：在日本中部远野地区，利用井眼阵列观测系统观测到的潮汐应变变化与原位岩石特性的比较

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摘要

We have developed a digital multi-component borehole instrument for boreholes deeper than 1 km and with diameters smaller than 98 mm, and installed it at the bottom of seven deep boreholes in the Tono region, central Japan. So far, our borehole instruments have observed not only tidal signals, but also strain-steps associated with large earthquakes, and environmentally induced signals. In this study, we analyze the strain data from four observation sites using the tidal analysis program BAYTAP-G and compare the tidal amplitudes of strain with in situ rock properties. We observed an obvious difference in amplitude and phase of the M2 and O1 tidal strains from four observation sites that are located in the same Toki granite bedrock within a distance of 10 km. There are strong negative correlations between the semi-diurnal E-W, areal tidal strain and in situ rock hardness (shear modulus and Young's modulus), while N-S tidal strain is unrelated. In contrast, strain-steps associated with large earthquakes increase with hardness, as observed at two sites. We consider that the inconsistency of the behavior of the tidal amplitudes and strain-steps may be caused by the heterogeneity of rocks near the borehole strainmeters.
机译：我们开发了一种数字化多组分钻孔仪，用于深度超过1 km且直径小于98 mm的钻孔，并将其安装在日本中部Tono地区七个深钻孔的底部。到目前为止，我们的钻孔仪器不仅观察到了潮汐信号，还观察到了与大地震有关的应变阶跃以及环境引起的信号。在这项研究中，我们使用潮汐分析程序BAYTAP-G分析了来自四个观测点的应变数据，并将应变的潮汐振幅与原位岩石特性进行了比较。我们在距离Toki花岗岩基岩10公里以内的四个观测点观察到M2和O1潮汐应变的振幅和相位存在明显差异。半日E-W，区域潮汐应变与原位岩石硬度（剪切模量和杨氏模量）之间存在很强的负相关性，而N-S潮汐应变则不相关。相反，在两个地点观察到，与大地震有关的应变阶跃随硬度增加。我们认为，潮汐振幅和应变阶跃行为的不一致可能是由井眼应变仪附近岩石的异质性引起的。

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