Three dimensional electrical conductivity distribution of the upper mantle around slab and mantle plume

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We revealed the three-dimensional electrical conductivity structure in the upper mantle beneath the Philippine Sea by applying seafloor electromagnetic data to the three-dimensional marine magnetotelluric inversion scheme. We also discussed the importance of incorporating topography around observation sites and choosing a proper initial model. The estimated electrical conductivity structure was verified by resolution and sensitivity tests.We analyzed seafloor electromagnetic data obtained around the Society hotspot in French Polynesia, and found the conductivity anomaly elongating from the mantle transition zone to the uppermost mantle just below the hotspot.