Open AccessH ‐polarization induction over an ocean edge coupled to the mantle by a conducting crust
Author(s) -
Nicoll M. A.,
Weaver J. T.
Publication year - 1977
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1977.tb03715.x
Subject(s) - mantle (geology) , geophysics , geology , crust , electromagnetic induction , slab , magnetic field , polarization (electrochemistry) , structure of the earth , physics , chemistry , quantum mechanics , electromagnetic coil
Summary. The Wiener—Hopf technique is used to obtain an exact analytical solution for the problem of H ‐polarization induction over the edge of a perfectly conducting thin sheet, representing an ocean, electrically connected to a perfectly conducting mantle through a slab of finite conductivity and thickness, which represents the Earths crust. It is shown that the induced currents resulting from this type of induction process are drawn up into the sea from the cust and mantle with the greatest concentration of current near the ocean edge. The surface impedance over the land surface, is calculated for various mantle depths and is shown to increase sharply as the coastline is approached. The magnetic field along the ocean floor is also plotted as a function of distance from the coastline, and the results are found to agree very well with those calculated previously by approximate and numerical methods.