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首页> 外文期刊>Nonlinear Processes in Geophysics Discussions >Magnetic transfer function entropy and the 2009 iM/isubw/sub = 6.3 L'Aquila earthquake (Central Italy)
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Magnetic transfer function entropy and the 2009 iM/isubw/sub = 6.3 L'Aquila earthquake (Central Italy)

机译：磁传递函数熵与2009年 M w = 6.3拉奎拉地震（意大利中部）

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摘要

With the aim of obtaining a deeper knowledge of the physical phenomena associated with the 2009 L'Aquila (Central Italy) seismic sequence, culminating with a Mw = 6.3 earthquake on 6 April 2009, and possibly of identifying some kind of earthquake-related magnetic or geoelectric anomaly, we analyse the geomagnetic field components measured at the magnetic observatory of L'Aquila and their variations in time. In particular, trends of magnetic transfer functions in the years 2006–2010 are inspected. They are calculated from the horizontal to vertical magnetic component ratio in the frequency domain, and are very sensitive to deep and lateral geoelectric characteristics of the measurement site. Entropy analysis, carried out from the transfer functions with the so called transfer function entropy, points out clear temporal burst regimes of a few distinct harmonics preceding the main shock of the seismic sequence. A possible explanation is that they could be related to deep fluid migrations and/or to variations in the micro-/meso-fracturing that affected significantly the conductivity (ordered/disordered) distribution in a large lithospheric volume under the seismogenic layer below L'Aquila area. This interpretation is also supported by the analysis of hypocentres depths before the main shock occurrence.
机译：为了更深入地了解与2009 L'Aquila（意大利中部）地震序列有关的物理现象，最终在2009年4月6日发生Mw = 6.3地震，并可能确定与地震有关的某种磁场或地电异常，我们分析了拉奎拉（L'Aquila）磁性天文台测得的地磁场分量及其随时间的变化。特别是检查了2006-2010年间的磁传递函数趋势。它们是根据频域中水平与垂直磁分量之比计算得出的，并且对测量站点的深部和侧部地电特性非常敏感。从传递函数和所谓的传递函数熵进行的熵分析指出了地震序列主震之前几个不同谐波的清晰的时间突发状态。可能的解释是，它们可能与深层流体运移和/或与微观/中观压裂的变化有关，这些变化显着影响了拉奎拉下方地震发生层下大岩石圈体积内电导率（有序/无序）分布的分布。区。在主震发生之前对震源深度的分析也支持了这种解释。

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