用DEMETER卫星研究汶川地震震前电离层异常

Q3 Multidisciplinary
Jingming LU, Yaogai HU, Chunhua JIANG, Zhengyu ZHAO, Yuannong ZHANG
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引用次数: 0

摘要

利用地震带电磁发射探测(DEMETER)卫星探测器ICE (Internet Communications Engine)、IAP (in Application Programming)和ISL (Interior Switching Link)卫星探测器2005 - 2008年夏季夜间观测数据,对中国汶川地区(21°-41°N, 93°-113°E)的震前电离层异常进行了研究和分析。本文以2008年5月12日汶川地震为例,采用空间网格化方法构建震中上方背景场,分析震源上甚低频(VLF)电场分量、低能粒子参数和等离子体参数的背景特征,定义震前各参数的扰动强度指数,提取各参数在空间和时间维度上的异常。结果表明,汶川地区部分电离层参数背景值与空间分布有关。此外,在汶川地震前15 d,提取了低频电场功率谱密度、H +浓度、He +浓度和离子浓度不同强度的异常增强和离子温度的异常减弱。在对数据进行过滤,排除太阳活动等外部干扰后,本文认为这些异常与汶川地震有一定的联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pre-Earthquake Ionospheric Anomalies of the Wenchuan Earthquake Studied with DEMETER Satellite
The pre-earthquake ionospheric anomalies in Wenchuan, China (21°-41°N, 93°-113°E) are studied and analyzed using the summer nighttime data from 2005 to 2008 measured by DEMETER (Detection of Electro-Magnetic Emission Transmitted from Earthquake Regions) satellite detectors ICE (Internet Communications Engine), IAP (In Application Programming), and ISL (Interior Switching Link). In this paper, we take the 12 May 2008 Wenchuan earthquake as an example, use the spatial gridding method to construct the background field over the epicenter, analyze the background characteristics of very low frequency (VLF) electric field components, low-energy particle parameters, and plasma parameters, and define the perturbation intensity index of each parameter before the earthquake to extract each parameter anomaly in both space and time dimensions. The results show that the background values of some ionospheric parameters in the Wenchuan area are related to spatial distribution. Moreover, anomalous enhancement of low-frequency electric field power spectral density, H + concentration, He + concentration and ion concentration with different intensities and anomalous weakening of ion temperature were extracted in the fifteen days before the Wenchuan earthquake. After filtering the data to exclude external interference, such as solar activity, this paper concludes that there is some connection between these anomalies and the Wenchuan earthquake.
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来源期刊
Wuhan University Journal of Natural Sciences
Wuhan University Journal of Natural Sciences Multidisciplinary-Multidisciplinary
CiteScore
0.40
自引率
0.00%
发文量
2485
期刊介绍: Wuhan University Journal of Natural Sciences aims to promote rapid communication and exchange between the World and Wuhan University, as well as other Chinese universities and academic institutions. It mainly reflects the latest advances being made in many disciplines of scientific research in Chinese universities and academic institutions. The journal also publishes papers presented at conferences in China and abroad. The multi-disciplinary nature of Wuhan University Journal of Natural Sciences is apparent in the wide range of articles from leading Chinese scholars. This journal also aims to introduce Chinese academic achievements to the world community, by demonstrating the significance of Chinese scientific investigations.
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