Features of the ionosphere behavior before the Kythira 2006 earthquake
Features of the ionosphere behavior before the Kythira 2006 earthquake
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2006 年基西拉地震前电离层行为特征
DOI：
10.2478/s11600-007-0031-5
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发表时间：
2007
期刊：
影响因子：
2.3
通讯作者：
K. Andrzej
中科院分区：
文献类型：
--
作者：
I. Zakharenkova;I. Shagimuratov;K. Andrzej
在本文中，我们提出的TEC（总电子含量的电离层）的行为的可能的前兆2006年1月8日（M6.8）基西拉（希腊南部）地震的具体特征。为此，我们使用了距离震中最近的GPS-IGS站的TEC数据和欧洲的TEC地图。进行这种分析的有利条件是地震前一段时间地磁情况平静。在震前一天，发现了一个特征异常，即最近台站的TEC在白天显著增加，相对于背景条件的值高达50%。为了估计地震-电离层异常的空间维数，采用了差分映射方法。在即将到来的地震震中附近的电离层修改为云状的电子浓度增加已被揭示。修改的幅度达到了50%的值，相对于无干扰的条件下，并存在从10：00到22：00 UT。TEC显著增强的区域在经度上约为4000公里，纬度上约为1500公里。
In this paper we present specific features of TEC (total electron content of the ionosphere) behavior as possible precursors of Kythira (Southern Greece) earthquake of January 8, 2006 (M6.8). For this purpose, we used both the TEC data of GPS-IGS stations nearest to the epicenter, and TEC maps over Europe. The favorable circumstance for this analysis was the quiet geomagnetic situation during the period prior to the earthquake. One day before the earthquake, a characteristic anomaly was found out as the day-time significant increase of TEC at the nearest stations, up to the value of 50% relative to the background condition. To estimate the spatial dimensions of seismo-ionospheric anomaly, the differential mapping method was used. The ionosphere modification as a cloud-like increase of electron concentration situated in the immediate vicinity of the forthcoming earthquake epicenter has been revealed. The amplitude of modification reached the value of 50% relative to the non-disturbed condition and was in existence from 10:00 till 22:00 UT. The area of significant TEC enhancement had a size of about 4000 km in longitude and 1500 km in latitude.