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- T41B-0136: Mantle Electrical Conductivity Structure of the European Continent Based on Diurnal Variation Signal from Ground Geomagnetic Observatories
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Board 0136‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Yang Daolin, China University of Geosciences (Wuhan) (First Author, Presenting Author)
Xu Shan, School of Geophysics and Geomatics, China University of Geosciences (Wuhan)
Chen Chaojian, School of Geosciences and Info-physics, Central South University
Xiangyun Hu, China University of Geosciences
The long-running ground geomagnetic observatories record aboundant data, those data can help probing Earth's mantle and estimating mantle water content. The study utlises time series of 149 mid-latitude ground-based observatories from 1997 to 2021 as raw data. Solar quiet equivalent current is fitted with spherical harmonics with frequencies 1 to 6 cycle per day. Transfer function between vertical and horizontal is estimated by least-square algorithm with Huber weight. The 1-D geoelectric models at ASP and 13 European observatories are inversed with L-BFGS algorithm, and real-time series of the magnetic field in observatories are calculated by inverse Fourier transform. The results indicate that upper mantle of central Europe is drier, and Mediterranean subduction zone casues more rapid lateral variation of mantle conductivity in southern Europe.
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