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Calculation of the piezomagnetic field arising from uniform regional stress in inhomogeneously magnetized crust

机译:非均匀磁化壳中均匀区域应力引起的压电磁场的计算

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This paper describes a simple procedure for the calculation of the piezomagnetic field arising from uniform regional stress in heterogeneously magnetized crust. There exists a strong similarity between the spatial distributions of anomalies in the geomagnetic total force values arising from magnetization structures in the Earth's crust and those arising from piezomagnetic signals that arise from there. This similarity enables us to compute the piezomagnetic field due to uniform regional stress without the need to determine the explicit structure of magnetization intensities in the crust. This situation is similar to that of "reduction to the pole", which is commonly used to interpret magnetic survey data. An explicit formula is presented that gives the 2-D spectrum of the piezomagnetic field from that of local magnetic anomalies; the formula is then applied to synthetic data. Calculated values are compared with the exact solution of the piezomagnetic field in order to assess the efficacy of the proposed method. The comparison verifies that calculations performed using the formula yield sufficiently accurate values for practical use.
机译:本文介绍了一种计算非均匀磁化壳中均匀区域应力引起的压电磁场的简单方法。在地壳中的磁化结构引起的地磁总力值的异常空间分布与在地壳中产生的压电信号引起的异常的空间分布之间存在强烈的相似性。这种相似性使我们能够计算由于区域应力均匀而产生的压电磁场,而无需确定地壳中磁化强度的明确结构。这种情况类似于“还原为极”,通常用于解释磁测量数据。给出了一个明确的公式,该公式从局部磁场异常的二维磁场中得出了压电磁场的二维频谱。然后将该公式应用于综合数据。将计算值与压电磁场的精确解进行比较,以评估所提出方法的有效性。通过比较可以验证使用该公式执行的计算得出足够准确的值以供实际使用。

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