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Flow instabilities in two-phase or supercritical crust fluids and its possible relevance to seismo-electromagnetic disturbances

Author

Listed:
  • Nadezda V. Yagova

    (Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences)

  • Viktor V. Yagov

    (National Research University MPEI (Moscow Power-Engineering Institute))

  • Ashwini K. Sinha

    (Indian Institute of Geomagnetism)

  • Masashi Hayakawa

    (Hayakawa Institute of Seismo Electromagnetics, Co. Ltd.)

  • Evgeny N. Fedorov

    (Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences)

  • Geeta Vichare

    (Indian Institute of Geomagnetism)

Abstract

Flow pulsations in two-phase and single-phase near-critical fluids are considered as a possible source of ultra-low-frequency seismo-electromagnetic variations. The conditions for generation and suppression of density wave instability in the crust are analyzed and the surface electromagnetic effect due to streaming potential generation is estimated. The upper limit of amplitude of magnetic field variations due to density wave instability is about 0.1 nT for single-phase supercritical and 1 nT for two-phase flow oscillations in the frequency range $$10^{-4}{-}10^{-2}~$$ 10 - 4 - 10 - 2 Hz for the temperature gradients and spatial scales possible during strike slip events. The signal is characterized by a decaying amplitude with typical relaxation time of about several quasi-periods. The possibility of generation of very low-frequency flow pulsations in two-phase fluids via individual bubble evolution and interaction with external acoustic waves is discussed.

Suggested Citation

  • Nadezda V. Yagova & Viktor V. Yagov & Ashwini K. Sinha & Masashi Hayakawa & Evgeny N. Fedorov & Geeta Vichare, 2018. "Flow instabilities in two-phase or supercritical crust fluids and its possible relevance to seismo-electromagnetic disturbances," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 92(1), pages 369-379, May.
    • Handle: RePEc:spr:nathaz:v:92:y:2018:i:1:d:10.1007_s11069-018-3203-5
    DOI: 10.1007/s11069-018-3203-5
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    1. H. M. Mader & E. E. Brodsky & D. Howard & B. Sturtevant, 1997. "Laboratory simulations of sustained volcanic eruptions," Nature, Nature, vol. 388(6641), pages 462-464, July.
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