孕震区上方DEMETER探测到的增强的ULF电磁活动
Enhanced ULF electromagnetic activity detected by DEMETER above seismogenic regions
摘要：
在本文中，我们提出的超低频（ULF）电磁（EM）辐射，记录的电场仪器（ICE）的卫星DEMETER在顶侧电离层，和地震活动的高，低地震活动的地区之间的比较结果。特别是，我们评估的能量变化的超低频Ez-电场组件在一个为期四年（2006-2009年），以检查检查可能的关系，超低频电磁辐射与地震孕震区位于中美洲，印度尼西亚，东地中海盆地和希腊。作为评估ULF Ez能量变化的工具，我们使用奇异谱分析（SSA）技术。我们的分析结果清楚地表明，在构造板块边界处，地震活动性最高的地区发射的超低频电磁能量显著增加。我们解释这些结果表明，在顶侧电离层中检测到的最高ULF EM能量起源于地壳内的地震过程。我们认为本研究的结果证实了以前的证据，即电离层中的超低频电磁异常波活动可以被认为是一种有用的地震前兆信号
英文摘要：
In this paper we present results of a comparison between ultra low frequency (ULF) electromagnetic (EM) radiation, recorded by an electric field instrument (ICE) onboard the satellite DEMETER in the topside ionosphere, and the seismicity of regions with high and lower seiismic activity. In particular we evaluated the energy variations of the ULF Ez-electric field component during a period of four years (2006-2009), in order to examine check the possible relation of ULF EM radiation with seismogenic regions located in central America, Indonesia, Eastern Mediterranean Basin and Greece. As a tool of evaluating the ULF Ez energy variations we used Singular Spectrum Analysis (SSA) techniques. The results of our analysis clearly show a significant increase of the ULF EM energy emmited from regions of highest seismic activity at the tectonic plates boundaries. We interpret these results as suggesting that the highest ULF EM energy detected in the topside ionosphere is originated from seismic processes within Earth's crust. We understand the results of the present study as confirming previous evidence that the ULF EM anomalous wave activity in the ionosphere can be considered a useful earthquake precursory signal
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