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首页> 外文期刊>Natural hazards and earth system sciences >Investigation of VLF and HF waves showing seismo-ionospheric anomalies induced by the 29 September 2009 Samoa earthquake (Mw=8.1)
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Investigation of VLF and HF waves showing seismo-ionospheric anomalies induced by the 29 September 2009 Samoa earthquake (Mw=8.1)

机译：2009年9月29日萨摩亚地震（Mw = 8.1）引起的地震电离层异常的VLF和HF波的调查

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摘要

In Samoa Islands, a powerful earthquake took place at 17:48:10.99 UTC (06:48:10.99 LT) on 29 September 2009 with a magnitude Mw=8.1. Using ICE (Instrument Champ Electrique) and IMSC (Instrument Magnetic Search Coil) experiments onboard the DEMETER (Detection of Electromagnetic Emissions Transmitted from Earthquake Regions) satellite we have surveyed possible variations in electromagnetic signals transmitted by the ground-based VLF transmitter NPM in Hawaii and in HF plasma waves close to the Samoa earthquake during the seismic activity. The indices Dst and Kp were used to distinguish pre-earthquake anomalies from the other anomalies related to the geomagnetic activities. In a previous study we have shown that anomalies in IAP (plasma analyzer) and ISL (Langmuir probe) experiments onboard the DEMETER and also TEC (Total Electron Content) data appear 1 to 5 days before the Samoa earthquake. In this paper we show that the anomalies in the VLF transmitter signal and in the HF range appear with the same time scale. The lack of significant geomagnetic activities indicates that these anomalous behaviors could be regarded as seismo-ionospheric precursors. It is also shown that comparative analysis is more effective in seismo-ionospheric studies.
机译：在萨摩亚群岛，2009年9月29日世界标准时间17：48：10.99（LT：06：48：10.99 LT）发生了强烈地震，震级Mw = 8.1。使用DEMETER（地震区域传输的电磁辐射检测）卫星上的ICE（仪器冠军电子）和IMSC（仪器电磁搜索线圈）实验，我们调查了夏威夷和美国的地面VLF发射器NPM发射的电磁信号的可能变化在地震活动期间接近萨摩亚地震的HF等离子体波中的电磁波。指标Dst和Kp用于区分地震前异常和其他与地磁活动有关的异常。在先前的研究中，我们发现在萨摩亚地震发生1到5天之前，DEMETER板上的IAP（血浆分析仪）和ISL（Langmuir探针）实验出现异常，TEC（总电子含量）数据也出现了。在本文中，我们表明VLF发射机信号和HF范围内的异常出现的时间尺度相同。缺乏重要的地磁活动表明这些异常行为可被视为地震电离层的前兆。还表明，比较分析在地震电离层研究中更有效。

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