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首页> 外文期刊>Journal of Asian earth sciences >The characteristics of quasistatic electric field perturbations observed by DEMETER satellite before large earthquakes
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The characteristics of quasistatic electric field perturbations observed by DEMETER satellite before large earthquakes

机译：大地震前DEMETER卫星观测到的准静态电场扰动特征

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摘要

This paper presents new results after processing the ULF electric field (DC-15 Hz) observed by DEMETER satellite (h = 660-710 km). Typical perturbations were picked up in quasistatic electric field around some large earthquakes in 2010 at first. And then, 27 earthquakes were selected to be analyzed on quasistatic electric field in two seismic regions of Indonesia and Chile at equatorial and middle latitude area respectively. Three-component electric field data related to earthquakes were collected along all the up-orbits (in local nighttime) in a limited distance of 2000 km to the epicenters during 9 days with 7 days before and 1 day after those cases, and totally 57 perturbations were found around them. All the results show that the amplitude of quasistatic electric field perturbations varies from 1.5 to 16 mV/m in the upper ionosphere, mostly smaller than 10 mV/m. And the perturbations were mainly located just over the epicen-tral area or at the end of seismic faults constructed by a series of earthquakes where electromagnetic emissions may be easily formed during preparation and development processes of seismic sequences. Among all 27 cases, there are 10 earthquakes with perturbations occurring just one day before, which demonstrates the close correlation in time domain between quasistatic electric field in ionosphere and large earthquakes. Finally, combined with in situ observation of plasma parameters, the coupling mechanism of quasistatic electric field in different earth spheres was discussed.
机译：本文介绍了在处理DEMETER卫星（h = 660-710 km）观察到的ULF电场（DC-15 Hz）之后的新结果。首先，在2010年一些大地震附近的准静态电场中出现了典型的扰动。然后，分别在赤道和中纬度地区的印度尼西亚和智利两个地震区选择了27次地震，以准静态电场进行分析。在9天，震中前后7天和震后1天期间，在距震中2000 km的有限距离内沿所有上行轨道（在当地夜间）收集了与地震有关的三分量电场数据，共发生了57次扰动被发现在他们周围。所有结果表明，准电磁场扰动的幅度在上电离层范围从1.5到16 mV / m不等，大多数小于10 mV / m。扰动主要位于大范围的正上方或由一系列地震构成的地震断层的末端，在地震序列的准备和开发过程中很容易形成电磁辐射。在这27个案例中，有10场地震是在一天前发生的，这表明电离层准静态电场与大地震在时域上有着密切的联系。最后，结合等离子体参数的原位观测，讨论了不同地球球体中准静态电场的耦合机理。

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