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本文利用DEMETER卫星运行约6.5年总离子浓度数据和期间全球发生Mw 4.8以上地震参数,自动检测距震中1500 km范围内、震前15天出现电离层扰动,统计电离层扰动异常随地震临近在时间、空间上的演化特征以及异常变化幅度随震级变化规律.数据处理过程中通过控制K_p指数以去掉部分因太阳活动引起的电离层扰动.统计结果显示,地震探测率及电离层响应异常幅度随震级增大而增高.大地震能引起强电离层扰动,扰动幅度可超过背景值1倍以上.全球范围,电离层存在变化活跃区,小幅度电离层扰动趋向于背景变化.北半球中低纬度地区是有利的地震电离层响应监测区.地震相关电离层扰动异常出现频次随地震临近而增高,主要出现在震前一周.空间上,扰动有随地震临近向震中运移的趋势.
In this paper, we use the total ion concentration data of about 6.5 years of DEMETER satellite operation and the earthquakes of Mw 4.8 above during the whole world to automatically detect the ionospheric disturbances within 1500 km from the epicenter. The ionospheric disturbances occurred 15 days before the epicenter. , The spatial evolvement characteristics and the variation range of anomaly vary with the magnitude.The ionospheric perturbations caused by solar activities are removed by controlling the Kp index during the data processing.The statistical results show that the seismic detection rate and the amplitude of the ionospheric response anomalies vary with the magnitude Increase and increase.Great earthquakes can cause strong ionospheric disturbance, the disturbance amplitude can exceed the background value of more than 1 times the global scope of the ionosphere active changes in the area, small amplitude ionospheric disturbances tend to background changes in the northern hemisphere is In the favorable seismic ionosphere response monitoring area, the frequency of earthquake-related ionospheric disturbance anomalies increased with the approach of the earthquake, which occurred mainly in the week before the earthquake. In space, the disturbance tended to move towards the epicenter with the earthquake approaching.