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Electrical image of the subducting Cocos Plate from magnetotelluric observations

Jorge A. Arzate, Marianne Mareschal and Dean Livelybrooks
Electrical image of the subducting Cocos Plate from magnetotelluric observations
Geology (Boulder) (August 1995) 23 (8): 703-706

Abstract

Magnetotelluric data acquired over the subducting Cocos plate in southern Mexico image the top of the oceanic plate for at least 150 km inland from the coast. Although fluid expulsion occurs in the accretionary prism, enough fluid appears to remain at the top of the subducting plate, because of sealing of pores and fractures on the underside of the continental plate, to produce the conductivity contrast necessary for electrical mapping. The results are supported by those of previous gravity and seismic refraction surveys that suggest the presence of more porous material on top of a denser, subducting oceanic crust. Earthquake epicenters also confirm the location of the top of the plate. Magnetotelluric data could, therefore, be used to map the Cocos plate along the entire Middle America Trench, where it is apparently broken into separate segments that subduct at different rates and dip at different angles.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 23
Serial Issue: 8
Title: Electrical image of the subducting Cocos Plate from magnetotelluric observations
Affiliation: Ecole Polytechnique, Genie Mineral, Montreal, QC, Canada
Pages: 703-706
Published: 199508
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 1995-053227
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N15°00'00" - N20°00'00", W100°00'00" - W94°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199519
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