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      Causal mechanisms of seismo-EM phenomena during the 1965–1967 Matsushiro earthquake swarm

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      a , 1 , 1 , 2
      Scientific Reports
      Nature Publishing Group

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          Abstract

          The 1965–1967 Matsushiro earthquake swarm in central Japan exhibited two unique characteristics. The first was a hydro-mechanical crust rupture resulting from degassing, volume expansion of CO 2/water, and a crack opening within the critically stressed crust under a strike-slip stress. The other was, despite the lower total seismic energy, the occurrence of complexed seismo-electromagnetic (seismo-EM) phenomena of the geomagnetic intensity increase, unusual earthquake lights (EQLs) and atmospheric electric field (AEF) variations. Although the basic rupture process of this swarm of earthquakes is reasonably understood in terms of hydro-mechanical crust rupture, the associated seismo-EM processes remain largely unexplained. Here, we describe a series of seismo-EM mechanisms involved in the hydro-mechanical rupture process, as observed by coupling the electric interaction of rock rupture with CO 2 gas and the dielectric-barrier discharge of the modelled fields in laboratory experiments. We found that CO 2 gases passing through the newly created fracture surface of the rock were electrified to generate pressure-impressed current/electric dipoles, which could induce a magnetic field following Biot-Savart’s law, decrease the atmospheric electric field and generate dielectric-barrier discharge lightning affected by the coupling effect between the seismic and meteorological activities.

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          Most cited references29

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          A Bilinear Source-Scaling Model for M-log A Observations of Continental Earthquakes

          T. Hanks (2002)
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            Modeling crustal deformation and rupture processes related to upwelling of deep CO2-rich fluids during the 1965–1967 Matsushiro earthquake swarm in Japan

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              Toward a unified solid state theory for pre-earthquake signals

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                Author and article information

                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group
                2045-2322
                21 March 2017
                2017
                : 7
                : 44774
                Affiliations
                [1 ]Shinshu University, Ueda Campus , 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan
                [2 ]Genesis Research Institute, Inc., 4-1-35 Noritake-shinmachi, Nishi-ku , Nagoya, Aichi, 451-0051, Japan
                Author notes
                Article
                srep44774
                10.1038/srep44774
                5359576
                5b69e8af-cf4a-4e66-b282-6ebcc48078c1
                Copyright © 2017, The Author(s)

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 25 November 2016
                : 13 February 2017
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