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首页> 外文期刊>Natural hazards and earth system sciences >The 6 April 2009 earthquake at L'Aquila: A preliminary analysis of magnetic field measurements
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The 6 April 2009 earthquake at L'Aquila: A preliminary analysis of magnetic field measurements

机译：2009年4月6日拉奎拉地震：磁场测量的初步分析

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Several investigations reported the possible identification of anomalous geomagnetic field signals prior to earthquake occurrence. In the ULF frequency range, candidates for precursory signatures have been proposed in the increase in the noise background and polarization parameter (i.e. the ratio between the amplitude/power of the vertical component and that one of the horizontal component), in the changing characteristics of the slope of the power spectrum and fractal dimension, in the possible occurrence of short duration pulses. We conducted, with conventional techniques of data processing, a preliminary analysis of the magnetic field observations performed at L'Aquila during three months preceding the 6 April 2009 earthquake, focusing attention on the possible occurrence of features similar to those identified in previous events. Within the limits of this analysis, we do not find compelling evidence for any of the features which have been proposed as earthquake precursors: indeed, most of aspects of our observations (which, in some cases, appear consistent with previous findings) might be interpreted in terms of the general magnetospheric conditions and/or of different sources.
机译：几项调查报告了在地震发生之前可能识别出异常的地磁场信号的可能性。在ULF频率范围内，在噪声背景和极化参数（即，垂直分量的幅度/功率与水平分量之一的幅度/功率之比）的增加，噪声特性和极化参数的增加中，已经提出了先验签名的候选者。在可能出现短时脉冲的情况下，功率谱的斜率和分形维数。我们使用常规的数据处理技术，对2009年4月6日地震发生前三个月在拉奎拉（L'Aquila）进行的磁场观测进行了初步分析，重点关注可能发生的特征与以前发生的事件类似。在此分析的范围内，我们没有找到令人信服的证据来证明已提出的地震前兆特征：确实，我们观察的大多数方面（在某些情况下似乎与以前的发现一致）可能会得到解释。就一般磁层状况和/或不同来源而言。

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