Gradients and phase velocities of ULF geomagnetic disturbances used to determine the source of an impending strong earthquake

Ismaguilov, V.; Kopytenko, Yu. A.; Hattori, Katsumi; Hayakawa, Masashi

doi:10.1134/s0016793206030157

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…The approach used in [Ismaguilov et al, 2003[Ismaguilov et al, , 2006Kopytenko et al, 2006] is based on the premise that an electromagnetic field propagates in the conductive Earth in a wave manner with strong attenuation. The amplitude-phase gradient method assumes that ULF wave horizontal propagation velocity is determined by crust conductivity as follows U = λ/T = 10ρ/T , where the relation of the wavelength with resistivity was used λ = 10ρT .…”

Section: Discrimination Of Underground Ulf Sources By Amplitude-phase...mentioning

confidence: 99%

A Closer Cooperation between Space and Seismology Communities – a Way to Avoid Errors in Hunting for Earthquake Precursors

Pilipenko,

Shiokawa

2024

Russian Journal of Earth Sciences

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The space physicists and the earthquake (EQ) prediction community exploit the same instruments – magnetometers, but for different tasks: space physicists try to comprehend the global electrodynamics of near-Earth space on various time scales, whereas the seismic community develops electromagnetic methods of short-term EQ prediction. The lack of deep collaboration between those communities may result sometimes in erroneous conclusions. In this critical review, we demonstrate some incorrect results caused by a neglect of specifics of geomagnetic field evolution during space weather activation. The considered examples comprise: Magnetic storms as a trigger of EQs; ULF waves as a global EQ precursor; Geomagnetic impulses before seismic shocks; Long-period geomagnetic disturbances generated by strong EQs; Discrimination of underground ULF sources by amplitude-phase gradients; Depression of ULF power as a short-term EQ precursor; and Detection of seimogenic emissions by satellites. To verify the reliability of the above widely disseminated results data from available arrays of fluxgate and search-coil magnetometers have been re-analyzed. In all considered events, the “anomalous” geomagnetic field behavior can be explained by global geomagnetic activity, and it is apparently not associated with seismic activity. This critical review does not claim that ULF electromagnetic field cannot be used as a sensitive indicator of the EQ preparation processes, but we suggest that both communities must cooperate their studies more tightly using data exchange, combined usage of magnetometer networks, organization of CDAW for unique events, etc.

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Section: Discrimination Of Underground Ulf Sources By Amplitude-phase...mentioning

confidence: 99%

A Closer Cooperation between Space and Seismology Communities – a Way to Avoid Errors in Hunting for Earthquake Precursors

Pilipenko,

Shiokawa

2024

Russian Journal of Earth Sciences

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show abstract

“…However, at each observation point on the Earth's surface, we observe the sum of incident and reflected electromagnetic waves. The phase velocities of electromagnetic wave propagation, as well as the gradients of the vertical component of the magnetic field variations along the Earth's surface, depend on the peculiarities of the geoelectrical structure of the Earth's crust; hence, the experimentally observed phase delays are nonzero [4,7,12,13].…”

Section: Measurement Of Apparent Resistivity Of the Earth's Crustmentioning

confidence: 99%

Investigation of the geoelectrical structure of the Earth’s crust by phase-gradient sounding

2015

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Regularities in the manifestation of earthquake precursors in the ionosphere and near-surface atmospheric electric fields in Kamchatka

et al. 2013

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Gradients and phase velocities of ULF geomagnetic disturbances used to determine the source of an impending strong earthquake

Cited by 3 publications

References 10 publications

A Closer Cooperation between Space and Seismology Communities – a Way to Avoid Errors in Hunting for Earthquake Precursors

A Closer Cooperation between Space and Seismology Communities – a Way to Avoid Errors in Hunting for Earthquake Precursors

Investigation of the geoelectrical structure of the Earth’s crust by phase-gradient sounding

Regularities in the manifestation of earthquake precursors in the ionosphere and near-surface atmospheric electric fields in Kamchatka

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