Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..196c&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 25, Issue 3, p. 196-201.
Physics
24
Scientific paper
Below the bottom of the sediments, the oceanic lithosphere is difficult to sound electromagnetically because the resistivity is high compared to over- and under-lying structures. There are three methods which can contribute information.
(1)|Magnetotelluric methods provide the impedance as a function of frequency for signals of sufficiently low frequency to penetrate through the ocean. In the deep sea the upper frequency limit is a few cph.
(2)|A quasi-static electric field can be measured at the ocean floor. The field is generated by charges built up by the motion of ocean water currents through the geomagnetic field. By providing a current path below the ocean, the lithospheric conductivity tends to reduce this field. In order to interpret the measurements, one needs to know the spatial character of the water motions.
(3)|An artificial EM source which transmits at frequencies near 1 Hz can be used at the ocean floor. Energy propagation through the lithosphere has been detected on the ocean floor to horizontal distances of 18 km. Detection is aided by the very low noise level at the high frequencies concerned.
Estimates of the typical conductivity distribution throughout the ocean crust are given.
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