Sea Bottom EM Field of M2 Tidal to Probe Upper Mantle Conductivity

Abstract:

Recent laboratory experiments demonstrate that electrical conductivity of upper mantle (UM) minerals is greatly increased by small amounts of water or by partial melt. Determination of deep conductivity using electromagnetic (EM) methods can thus provide constraints on the presence of volatiles and melting processes in UM. Probing conductivity at UM depths requires EM data with periods of a few to one cycle per day. This is a challenging period range for EM studies due to the spatially complex ionospheric source that dominates at these periods. The idea of exploiting tidal signals for EM studies of the Earth is not new, but so far it was used only for interpretation of inland and transoceanic electric field data due to M2. Emphasis in this work is made on a discussion of sea bottom magnetic field of the same origin.

• Periodical: Advanced Materials Research (Volume 683)
• Pages: 828-831
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.683.828
• Online since: April 2013
• Authors: Yan Xu, Jun Xu, Wen Hu Zhang
• Keywords: Electromagnetic Field (EMF), M2 Tidal, Sea Bottom, Simulation

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