Anomalous radon emanation linked to preseismic electromagnetic phenomena

Y. Omori; Y. Yasuoka; H. Nagahama; Y. Kawada; T. Ishikawa; S. Tokonami; M. Shinogi

doi:10.5194/nhess-7-629-2007

Anomalous radon emanation linked to preseismic electromagnetic phenomena

Y. Omori, Y. Yasuoka, H. Nagahama, Y. Kawada, T. Ishikawa, S. Tokonami, M. Shinogi

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

Anomalous emanation of radon (²²²Rn) 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 powerlaw 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 10⁴-10⁵ V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.

Original language	English
Pages (from-to)	629-635
Number of pages	7
Journal	Natural Hazards and Earth System Science
Volume	7
Issue number	5
DOIs	https://doi.org/10.5194/nhess-7-629-2007
Publication status	Published - 2007

ASJC Scopus subject areas

Earth and Planetary Sciences(all)

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title = "Anomalous radon emanation linked to preseismic electromagnetic phenomena",

abstract = "Anomalous emanation of radon (222Rn) 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 powerlaw 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 104-105 V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.",

author = "Y. Omori and Y. Yasuoka and H. Nagahama and Y. Kawada and T. Ishikawa and S. Tokonami and M. Shinogi",

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T1 - Anomalous radon emanation linked to preseismic electromagnetic phenomena

AU - Omori, Y.

AU - Yasuoka, Y.

AU - Nagahama, H.

AU - Kawada, Y.

AU - Ishikawa, T.

AU - Tokonami, S.

AU - Shinogi, M.

PY - 2007

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AB - Anomalous emanation of radon (222Rn) 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 powerlaw 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 104-105 V/m enough to trigger ionospheric disturbances. These changes are within the ranges observed or explaining electromagnetic phenomena associated with large earthquakes.

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