EM induction in the Vancouver Island region: 3D numerical, analogue model, and field site results
Identifieur interne : 004586 ( Main/Exploration ); précédent : 004585; suivant : 004587EM induction in the Vancouver Island region: 3D numerical, analogue model, and field site results
Auteurs : H. W. Dosso [Canada] ; A. K. Agarwal [Canada] ; J. Chen [Canada]Source :
- pure and applied geophysics [ 0033-4553 ] ; 1992-06-01.
Abstract
Abstract: Electromagnetic induction in the Vancouver Island region for a uniform inducing source field for 300 s period is investigated with the aid of three-dimensional (3-D) numerical and analogue model results and field site measurements. The thin sheet numerical model, based on the subducting Juan de Fuca plate analogue model ofDosso et al., consists of a 5km thick non-uniform thin sheet (comprising the lateral conductivity contrasts arising from the land, the varying depth ocean, and the sediment) underlain by a four-layer conductive structure. The four-layer conductive structure beneath the non-uniform thin sheet simulates the effect of the Juan de Fuca plate subducting Vancouver Island. To examine the effects of the ocean channel depth between Vancouver Island and the British Columbia (Canada) mainland, numerical results were obtained for two channel depths (0 and 600 m). The results indicate that the channel plays an important role in the geomagnetic response in the central and inner coastal regions of Vancouver Island. The general agreement of the 3-D numerical model induction arrows with the analogue model and field site induction arrows for 300 s supports the premise of a layered conductive substructure dipping at a small angle, at most, beneath Vancouver Island.
Url:
DOI: 10.1007/BF00878895
Affiliations:
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W." last="Dosso">H. W. Dosso</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Victoria, Victoria, B.C.</wicri:regionArea><wicri:noRegion>B.C.</wicri:noRegion></affiliation></author><author><name sortKey="Agarwal, A K" sort="Agarwal, A K" uniqKey="Agarwal A" first="A. K." last="Agarwal">A. K. Agarwal</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Victoria, Victoria, B.C.</wicri:regionArea><wicri:noRegion>B.C.</wicri:noRegion></affiliation></author><author><name sortKey="Chen, J" sort="Chen, J" uniqKey="Chen J" first="J." last="Chen">J. Chen</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Victoria, Victoria, B.C.</wicri:regionArea><wicri:noRegion>B.C.</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">pure and applied geophysics</title><title level="j" type="sub">pageoph</title><title level="j" type="abbrev">PAGEOPH</title><idno type="ISSN">0033-4553</idno><idno type="eISSN">1420-9136</idno><imprint><publisher>Birkhäuser-Verlag</publisher><pubPlace>Basel</pubPlace><date type="published" when="1992-06-01">1992-06-01</date><biblScope unit="volume">138</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="193">193</biblScope><biblScope unit="page" to="206">206</biblScope></imprint><idno type="ISSN">0033-4553</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0033-4553</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Electromagnetic induction in the Vancouver Island region for a uniform inducing source field for 300 s period is investigated with the aid of three-dimensional (3-D) numerical and analogue model results and field site measurements. The thin sheet numerical model, based on the subducting Juan de Fuca plate analogue model ofDosso et al., consists of a 5km thick non-uniform thin sheet (comprising the lateral conductivity contrasts arising from the land, the varying depth ocean, and the sediment) underlain by a four-layer conductive structure. The four-layer conductive structure beneath the non-uniform thin sheet simulates the effect of the Juan de Fuca plate subducting Vancouver Island. To examine the effects of the ocean channel depth between Vancouver Island and the British Columbia (Canada) mainland, numerical results were obtained for two channel depths (0 and 600 m). The results indicate that the channel plays an important role in the geomagnetic response in the central and inner coastal regions of Vancouver Island. The general agreement of the 3-D numerical model induction arrows with the analogue model and field site induction arrows for 300 s supports the premise of a layered conductive substructure dipping at a small angle, at most, beneath Vancouver Island.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Dosso, H W" sort="Dosso, H W" uniqKey="Dosso H" first="H. W." last="Dosso">H. W. Dosso</name></noRegion><name sortKey="Agarwal, A K" sort="Agarwal, A K" uniqKey="Agarwal A" first="A. K." last="Agarwal">A. K. Agarwal</name><name sortKey="Chen, J" sort="Chen, J" uniqKey="Chen J" first="J." last="Chen">J. Chen</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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