Anomalous radon emanation linked to preseismic electromagnetic phenomena
Anomalous radon emanation linked to preseismic electromagnetic phenomena
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DOI：
10.5194/nhess-7-629-2007
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发表时间：
2007-01-01
影响因子：
4.6
通讯作者：
Shinogi, M.
中科院分区：
文献类型：
--
作者：
Omori, Y.;Yasuoka, Y.;Shinogi, M.
氡（Rn-222）的异常射气在大地震前被观测到，并被认为与震前电磁现象（如大气电场的巨大变化和电离层扰动）有关。本文分析了大气中氡浓度，并估计了大气中电性条件的变化，由于前氡异常。氡射气的增加服从地壳损伤演化，遵循时间到地震的幂律。氡射气使大气电场强度降低40%，并使大气电场最大强度降低10（4）~ 10（5）V/m，足以引起电离层扰动。这些变化在观测到的范围内，或解释与大地震有关的电磁现象。
Anomalous emanation of radon (Rn-222) was observed preceding large earthquakes and is considered to be linked to preseismic electromagnetic phenomena (e.g. great changes of atmospheric electric field and ionospheric disturbances). Here we analyze atmospheric radon concentration and estimate changes of electrical conditions in atmosphere due to preseismic radon anomaly. The increase of radon emanation obeys crustal damage evolution, following a power-law of time-to-earthquake. Moreover, the radon emanation decreases the atmospheric electric field by 40%, besides influencing the maximum strength of atmospheric electric field by 10(4)-10(5) V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.