NDLI: Three-dimensional electrical conductivity structure beneath North Pacific by using a submarine cable network

Content Provider	IEEE Xplore Digital Library
Author	Koyama, T. Shimizu, H. Utada, H.
Copyright Year	2003
Description	Author affiliation: IFREE, Japan Marine Sci. & Technol. Center, Japan (Koyama, T.)
Abstract	We present a model of 3-D electrical conductivity structure in the mid-mantle estimated by using voltage data by eight submarine cables as well as magnetic field data around the North Pacific. We assumed that 3-D heterogeneous conductivity distribution could be separated into radially symmetric (1-D) structure and 3-D perturbation. The 1-D model obtained by Utada et al. (2003) is employed as the reference model, and the distribution of the 3-D perturbation is inversely estimated so that the observation-calculation misfit is minimized. As the results, following features in the obtained 3-D conductivity structure are found to be similar to the seismic velocity structure: 1) conductive zone in the transition zone beneath Hawaii with a conductivity perturbation of factor of three; and 2) resistive zone in the uppermost lower mantle beneath Philippines with twice as resistive as the 1-D reference model. Assuming that the heterogeneities purely of thermal origin, temperature anomalies are estimated to be 200-300 degrees.
Sponsorship	IEEE Oceanic Eng. Soc. Japan Chapter Earthquake Res. Inst., Univ. Tokyo Inst. Ind. Sci., Univ. Tokyo Ocean Res. Inst., Univ. Tokyo Japan Marine Sci. & Technol. Center
Starting Page	101
Ending Page	106
File Size	648016
Page Count	6
File Format	PDF
ISBN	0780377753
DOI	10.1109/SSC.2003.1224121
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-25
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Underwater cables Voltage Geomagnetism Geophysical measurements Temperature Magnetic fields Conductivity measurement Electric variables measurement Laboratories Frequency estimation
Content Type	Text
Resource Type	Article

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