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首页> 外文期刊>Earth, planets and space: EPS >Tectonomagnetic study in the eastern part of Hokkaido, NE Japan: Discrepancy between observed and calculated results
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Tectonomagnetic study in the eastern part of Hokkaido, NE Japan: Discrepancy between observed and calculated results

机译：日本东北部北海道东部的构造磁研究：观测结果与计算结果之间的差异

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Continuous and repeated geomagnetic observations have been performed at 8 stations in the eastern part of Hokkaido, NE Japan, to confirm a detailed picture of geomagnetic secular changes. The observation delineated anomalously large secular changes of about 1 nT/year that have lasted at least for about 3 to 30 years (depending on the period of observations) at 3 stations situated in the remarkable geomagnetic anomaly region. Contributions from the earth's core or ionospheric origin are ruled out as source mechanisms because of the local distribution of the anomalous stations. Heat-triggered volcanomagnetic effect cannot be the origin of such secular changes because the stations are quite far from the volcanoes. Instead, we propose the changes originate from stressinduced tectonomagnetic effect (piezomagnetism). We performed piezomagnetic modeling under the condition that observed regional tectonic stress has been applied to the highly magnetized rock bodies inferred from the analysis of the observed geomagnetic anomalies. The modeling explained well the secular changes by assuming the stress sensitivity of the order of 10-2 MPa-1, which is one order larger than the ordinarily used value.
机译：在日本东北部北海道东部的8个站点进行了连续和重复的地磁观测，以确认详细的地磁长期变化图。观测描述了异常地表长期变化，每年约1 nT /年，在显着的地磁异常区域中的3个台站至少持续了约3至30年（取决于观测期）。由于异常站的局部分布，排除了来自地球核心或电离层起源的贡献作为源机制。由于这些站离火山很远，因此热触发的火山磁效应不能成为这种长期变化的起源。取而代之的是，我们提出这些变化源自应力诱发的构造磁效应（磁致磁性）。我们在将观测到的区域构造应力应用于根据观测到的地磁异常分析推断出的高磁化岩体的条件下进行了压电建模。该模型通过假设应力敏感度为10 -2 MPa -1 很好地解释了长期变化，这比通常使用的值大一个数量级。

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