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Further investigations of geomagnetic diurnal variations associated with the 2011 off the Pacific coast of Tohoku earthquake (Mw 9.0)

机译:与2011年东北太平洋太平洋地震(Mw 9.0)相关的地磁日变化的进一步研究

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As one of the most promising candidates for short-term earthquake forecasting, the seismo-electromagnetic phenomena have been intensively studied for several decades. Recently, Xu et al. (2013) have reported unusual behaviors of geomagnetic diurnal variations in the vertical component prior to the 2011 off the Pacific coast of Tohoku earthquake (Mw 9.0). To validate this result, further investigations have been applied in this study. Geomagnetic data of 16 years' long term observation have been analyzed using the same method in Xu et al. (2013). Ratios of diurnal variation range between the target station Esashi (ESA) which is about 130 km from the epicenter and the remote reference station Kakioka (KAK) about 300 km distant to the epicenter have been computed. After removing seasonal variations revealed by wavelet transform analysis, the 15-day mean values of the ratios in the vertical component shows a clear anomaly exceeding the statistical threshold about 2 months before the mega event. This anomaly is unique over a 16-year long background, and further discussions indicate that this anomaly is unlikely caused by strong geomagnetic storms or a statistical fluke. Therefore, this study has provided a strong support to the previous results in Xu et al. (2013). (c) 2015 Elsevier Ltd. All rights reserved.
机译:作为短期地震预报的最有希望的候选者之一,几十年来对地震电磁现象进行了深入研究。最近,徐等人。 (2013年)报道了2011年东北东北太平洋地震(Mw 9.0)之前垂直分量地磁日变化的异常行为。为了验证该结果,在这项研究中进行了进一步的研究。徐等人使用相同的方法分析了16年长期观测的地磁数据。 (2013)。计算出距震中约130 km的目标站点Esashi(ESA)与距震中约300 km的远程参考站点Kakioka(KAK)之间的日变化范围比率。除去小波变换分析揭示的季节性变化后,垂直分量的比率的15天平均值显示出明显异常,超过了特大事件发生前约2个月的统计阈值。这种异常在长达16年的背景中是独特的,进一步的讨论表明,这种异常不太可能是由强地磁风暴或统计fl幸引起的。因此,这项研究为Xu等人以前的研究结果提供了有力的支持。 (2013)。 (c)2015 Elsevier Ltd.保留所有权利。

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