Computer Science – Sound
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320...52c&link_type=abstract
Nature, Volume 320, Issue 6057, pp. 52-54 (1986).
Computer Science
Sound
42
Scientific paper
The attenuation of ionospheric signals in the frequency range 0.06-24 Hz by sea water effectively precludes using the magnetotel-luric method to study the electrical structure of the upper oceanic lithosphere. We have carried out a dipole-dipole electromagnetic sounding in the North Pacific by injecting electromagnetic signals into the ocean and sea bed. The crust at the site is 25 Myr old and has a thin sediment cover. The technique, similar to that used in earlier work1,2, involves dragging a horizontal dipole antenna along the sea floor. The electric fields that propagated through the resistive basement were detected by seafloor receivers at ranges of 10-65 km. As the ambient electric field is very small (varying from 10-18 V2 m-2 Hz-1 at 0.1 Hz to 10-24 V2 m2 Hz-1 above 1 Hz; ref. 3), the controlled-source signals could be easily monitored. Our data are consistent with a simple one-dimensional Earth model consisting of a 3-7-km-thick crustal layer of moderate conductivity (~0.001 S m-1) underlain by a thicker region of very low conductivity (<2 × 10-5 S m-1). The results suggest an upper mantle water content of at most 0.1% by volume.
Chave Alan D.
Constable S. C.
Cox Charles S.
Webb Spahr C.
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