Physics – Geophysics
Scientific paper
2009-12-04
Physics
Geophysics
15 pages, 24 figures, http://www.earthquakeprediction.gr
Scientific paper
We study the Earth's electric field monitored at PYR (Greece) monitoring site, for a period of more than six years (May 23rd, 2003 to September 7th, 2009). It is compared, in particular its oscillating component of T = 365 days, with the Perihelion - Aphelion dates of the Earth's orbit around the Sun, with the same component of the Earth's magnetic field, with the corresponding same period tidal oscillation and with the occurred large EQs of the same period of time. The obtained results suggest that the oscillating electric field component is generated by large scale piezoelectricity triggered by the Earth's shape - lithospheric oscillating deformation. The driving mechanism (yearly tidal variation) precedes the Aphelion - Perihelion dates for a month complying with the corresponding tidal friction behavior of the Earth's shape deformation. The Earth's oscillating electric field peaks coincide with the Perihelion - Aphelion dates while the triggered large EQs are clustered very close to the Perihelion - Aphelion dates. Moreover it is shown that the observed Earth's oscillating electric field is not related to or induced by the corresponding Earth's magnetic field. In conclusion, the Earth's oscillating electric field character could be used as medium to long term electric seismic precursor of large EQs. Keywords: tidal waves, Earth deformation, preseismic electric signals, magnetic field, Perihelion, Aphelion, earthquake prediction.
Klentos V.
Thanassoulas Constantine
Tsailas P.
Verveniotis G.
Zymaris N.
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