气流循环是近地表电场震前异常的可能原因之一

IF 0.9 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
V. V. Surkov
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引用次数: 0

摘要

摘要 对地球垂直大气电场的地基测量有时会显示出一些地震前的海湾状异常。在某些情况下,在天气晴朗的条件下,这些异常现象甚至伴随着电场符号的变化。造成这种现象的可能原因通常是近地面大气层的导电率发生了异常变化、土壤中的氡排放量增加等。本文提出了大气电异常的另一种机制,即气流夹带带电气溶胶以及轻重离子。在某些地震事件发生前观测到的微小温度异常可能会产生这种气流。理论分析表明,即使存在微弱的气流,也可能发生异常强烈的电变化,条件是气流持续时间长,速度场结构特殊,假定不同大气层之间存在垂直空气循环和粒子交换。对于这种类型的气流,推导出了一个解析解,并获得了大气电扰动的空间分布。计算和估算结果证实,所提出的机制可以解释观测数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Air Flow Circulation as a Possible Cause of Preseismic Anomalies in the Near-Surface Electric Field

Air Flow Circulation as a Possible Cause of Preseismic Anomalies in the Near-Surface Electric Field

Air Flow Circulation as a Possible Cause of Preseismic Anomalies in the Near-Surface Electric Field

Ground-based measurements of the vertical atmospheric electric field of the Earth sometimes show bay-like anomalies that precede some earthquakes. In some cases, these anomalies have even been accompanied by a change in the sign of the field under fair weather conditions. Possible causes of this phenomenon are typically attributed to anomalous changes in the electrical conductivity in the near-surface atmospheric layer, increased radon emission from the soil, etc. This paper proposes another mechanism of atmospheric electrical anomalies, which involves the entrainment of charged aerosols as well as light and heavy ions by air flows. Such flows can be produced due to small temperature anomalies observed before some seismic events. Theoretical analysis shows that anomalously strong electrical variations may occur even in the presence of weak air flows provided that they persist for a long time and a peculiar structure of the velocity field, which presumes vertical air circulation and particle exchange between different atmospheric layers. For this type of flows, an analytic solution is derived and spatial distributions of atmospheric electric perturbations are obtained. The results of calculations and estimates confirm that the proposed mechanism can explain the observation data.

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来源期刊
Izvestiya, Physics of the Solid Earth
Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理
CiteScore
1.60
自引率
30.00%
发文量
60
审稿时长
6-12 weeks
期刊介绍: Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.
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