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Studies on the lithosphere and the water transport by using the Japan Sea submarine cable (JASC): 1. Theoretical considerations
Earth, Planets and Space volume 50, pages35–42(1998)
The Japan Sea Cable (JASC) was retired from telecommunications services and its ownership transferred to the scientific community in February, 1996. For the first stage of its scientific reuse program, a Japan-Russia joint project has been initiated to monitor electrical potential differences across the Japan Sea to study the electrical conductivity distribution in the Earth and the water transport across the cable.
This paper describes preliminary investigations by forward modelling study to explore possible results from the voltage observation, before analyzing real data. On the resistivity structure, modelling has suggested that voltage data is most sensitive to the conductance of resistive lithosphere, especially at longer periods. Water transport modelling has shown that the heterogeneity of sub-bottom resistivity does not greatly influence the cable voltage, and that water transport of 5–6 Sv in the Japan Sea can generate voltage differences of 70–80 mV across the JASC. A preliminary observation was found to be roughly consistent with this estimation.
Chave, A. D. and D. S. Luther, Low-frequency, motionally induced electro-magnetic fields in the ocean, 1. Theory, J. Geophys. Res., 95, 7185–7200, 1990.
Chave, A. D., D. S. Luther, and J. H. Filloux, Observation of the boundary current system and heat transport at 26.5 N in the Subtropical North Atlantic Ocean, J. Phys. Ocean., 27, 1827–1848, 1997.
Cox, C. S., Electromagnetic induction in the oceans and inferences on the constitution of the Earth, Geophys. Surv., 4, 137–156, 1980.
Flosadottir, A. H., J. C. Larsen, and J. T. Smith, Motional induction in North Atlantic circulation models, J. Geophys. Res., 102, 10353–10372, 1997.
Fujii, I., L. J. Lanzerotti, H. Utada, H. Kinoshita, J. Kasahara, L. V. Medford, and C. G. Maclennan, Geoelectric power spectra over oceanic distances, Geophys. Res. Lett., 22, 421–424, 1995.
Kasahara, J., H. Utada, and H. Kinoshita, GeO-TOC project-Reuse of submarine cables for seismic and geoelectrical measurements, J. Phys. Earth, 43, 619–628, 1995.
Lanzerotti, L. J., A. D. Chave, C. H. Sayres, L. V. Medford, and C. G. Maclennan, Large scale electric field measurements on the Earth’s sur-face: A review, J. Geophys. Res., 98, 23525–23534, 1993.
Larsen, J. C., Transport and heat flux of the Florida Current at 27 N derived from cross-stream voltages and profiling data: Theory and observations, Phil. Trans. R. Soc. Lond., A 338, 169–236, 1992.
Levitus, S., Climatological atlas of the World ocean, NOAA Profess. Pap., 13, 1–173, 1982.
Lizarralde, D., A. D. Chave, G. Hirth, and A. Schultz, Northeastern Pacific mantle conductivity profile from long-period magnetotelluric sounding using Hawaii-to-California submarine cable data, J. Geophys. Res., 100, 17837–17854, 1995.
Palshin, N. A., Sea-floor deep magnetotelluric soundings in the northeastern Pacific, Tikhookeanskaya Geologiya, 6, 95–99, 1988 (in Russian).
Palshin, N. A., Oceanic electromagnetic studies. A review, Surv. Geophys., 17, 465–491, 1996.
Palshin, N. A., L. L. Vanyan, and P. Kaikkonen, On-shore amplification of the electric field induced by a coastal sea current, Phys. Earth Planet. Int., 94, 269–273, 1996.
Sanford, T. B., Motionally-induced electric and magnetic fields in the sea, J. Geophys. Res., 76, 3476–3492, 1971.
Sarkisyan, A. S., The diagnostic calculations of large scale oceanic circulation, The Sea, 6, 363–458, 1977.
Semenov, V. Yu. and M. Rodkin, Conductivity structure of the upper mantle in an active subduction zone, J. Geodynamics, 21, 395–364, 1996.
Utada, H., Y. Hamano, and J. Segawa, Conductivity anomaly around the Japanese Islands, in Geology and Geophysics of the Japan Sea, pp. 103–149, Terra Sci. Publ., 1996.
Vanyan, L. L. and I. V. Yegorov, Numerical modelling of the magnetotelluric field in the three-layered inhomogeneous media, Fizika Zemli, No. 7, 121–125, 1992 (in Russian).
Vanyan, L. L., T. A. Demidova, I. V. Yegorov, and R. P. Bulatov, Charac-teristics of electric field induced by Gulf Stream (Numerical simulation), Phys. Solid Earth, 28, 339–342, 1992.
Vanyan, L. L., N. A. Palshin, and I. A. Repin, Deep magnetotelluric sounding using submarine cable Australia — New-Zealand. 2. Interpretation, Fizika Zemli, No. 5, 53–57, 1995.
Vasseur, G. and P. Weidelt, Bimodal electromagnetic induction in non-uniform thin sheets with application to the Northern Pyrenean Anomaly, Geophys. J. R. Astr. Soc., 51, 669–690, 1977.
Yegorov, I. V. and N. A. Palshin, Numerical modelling of the magnetotelluric fields in the inhomogeneous layered media, Fizika Zemli, No. 6, 68–72, 1994 (in Russian).
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Vanyan, L.L., Utada, H., Shimizu, H. et al. Studies on the lithosphere and the water transport by using the Japan Sea submarine cable (JASC): 1. Theoretical considerations. Earth Planet Sp 50, 35–42 (1998) doi:10.1186/BF03352084
- Water Transport
- Apparent Resistivity
- Submarine Cable