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ULF magnetic signatures at the Earth surface due to ground water flow: A possible precursor to earthquakes
Author(s) -
Draganov A. B.,
Inan U. S.,
Taranenko Yu. N.
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl01000
Subject(s) - geology , geophysics , wavelength , magnetic field , flow (mathematics) , homogeneous , transverse plane , earth (classical element) , flow velocity , geodesy , physics , mechanics , optics , structural engineering , engineering , quantum mechanics , mathematical physics , thermodynamics
Magnetic field fluctuations at the earth's surface ofΔ B B ∼ 10 − 5at <1 Hz are shown to result from motion with a peak velocity of ∼4 cm/s of ground water (∼4 S/m) at ∼5 km depth. Surface field changes can occur due to either divergence free fluid motion with transverse spatial wavelengths of a few tens of km, and/or homogeneous flow which displaces local inhomogeneities in the earth magnetic field.