Marine electromagnetic research
Identifieur interne : 001121 ( Istex/Curation ); précédent : 001120; suivant : 001122Marine electromagnetic research
Auteurs : L. K. Law [Canada]Source :
- Geophysical surveys [ 0046-5763 ] ; 1983-07-01.
Abstract
Abstract: All aspects of Marine Electromagnetic Research have made important advances over the last few years: theoretical studies, instrument design and data from equipment on the bottom of the ocean. The seafloor results show that the depth to the conducting asthenosphere is greater under older lithosphere and thus the thickness of the lithosphere increases with age. To obtain greater resolution of the electrical conductivity structure of the upper layers, several controlled source systems were developed. The first observations indicate a decrease in conductivity a few kilometers below the seafloor. Improved theoretical response curves for the electromagnetic fields at an ocean-continent boundary are now available. The theoretical curves, combined with land and seafloor data from coastal regions, allow the effects of the electric currents induced in the seawater to be separated from those caused by currents in the tectonic structure at the continental margin. Of growing interest is the application of electromagnetic methods to determine oceanographic wave parameters. Recent studies have investigated meanders in ocean current patterns, the response of internal edge waves and the tidal effect. With the forseeable improvements in seafloor instrumentation it will be possible to investigate the conductivity structure of offshore basins and the hydrothermal deposits associated with spreading ridges.
Url:
DOI: 10.1007/BF01453997
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Marine electromagnetic research</title><author><name sortKey="Law, L K" sort="Law, L K" uniqKey="Law L" first="L. K." last="Law">L. K. Law</name><affiliation wicri:level="1"><mods:affiliation>Dept. Energy, Mines and Resources, Pacific Geoscience Centre, Sidney, B. C., Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Dept. Energy, Mines and Resources, Pacific Geoscience Centre, Sidney, B. C.</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:FDB39D06FA16AE45621FFEB8A49ADBF70B08D0F9</idno><date when="1983" year="1983">1983</date><idno type="doi">10.1007/BF01453997</idno><idno type="url">https://api-v5.istex.fr/document/FDB39D06FA16AE45621FFEB8A49ADBF70B08D0F9/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001121</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001121</idno><idno type="wicri:Area/Istex/Curation">001121</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Marine electromagnetic research</title><author><name sortKey="Law, L K" sort="Law, L K" uniqKey="Law L" first="L. K." last="Law">L. K. Law</name><affiliation wicri:level="1"><mods:affiliation>Dept. Energy, Mines and Resources, Pacific Geoscience Centre, Sidney, B. C., Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Dept. Energy, Mines and Resources, Pacific Geoscience Centre, Sidney, B. C.</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Geophysical surveys</title><title level="j" type="abbrev">Geophysical Surveys</title><idno type="ISSN">0046-5763</idno><idno type="eISSN">1573-0956</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1983-07-01">1983-07-01</date><biblScope unit="volume">6</biblScope><biblScope unit="issue">1-2</biblScope><biblScope unit="page" from="123">123</biblScope><biblScope unit="page" to="135">135</biblScope></imprint><idno type="ISSN">0046-5763</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0046-5763</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: All aspects of Marine Electromagnetic Research have made important advances over the last few years: theoretical studies, instrument design and data from equipment on the bottom of the ocean. The seafloor results show that the depth to the conducting asthenosphere is greater under older lithosphere and thus the thickness of the lithosphere increases with age. To obtain greater resolution of the electrical conductivity structure of the upper layers, several controlled source systems were developed. The first observations indicate a decrease in conductivity a few kilometers below the seafloor. Improved theoretical response curves for the electromagnetic fields at an ocean-continent boundary are now available. The theoretical curves, combined with land and seafloor data from coastal regions, allow the effects of the electric currents induced in the seawater to be separated from those caused by currents in the tectonic structure at the continental margin. Of growing interest is the application of electromagnetic methods to determine oceanographic wave parameters. Recent studies have investigated meanders in ocean current patterns, the response of internal edge waves and the tidal effect. With the forseeable improvements in seafloor instrumentation it will be possible to investigate the conductivity structure of offshore basins and the hydrothermal deposits associated with spreading ridges.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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