ULF magnetic signatures at the earth surface due to ground water flow - A possible precursor to earthquakes

Details ULF magnetic signatures at the earth surface due to ground water flow - A possible precursor to earthquakes ULF magnetic signatures at the earth surface due to ground water flow - A possible precursor to earthquakes

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1127d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, June 1991, p. 1127-1130. Stanford University-supported research.

Physics

29

Earth Surface, Earthquakes, Extremely Low Radio Frequencies, Ground Water, Magnetic Field Configurations, Magnetic Signatures, Fourier Transformation, Geomagnetism, Magnetohydrodynamics

Scientific paper

Magnetic field fluctuations at the earth's surface at less than 1 Hz are shown to result from motion with a peak velocity of about 4 cm/s of ground water (about 4 S/m) at about 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.

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