A recipe to estimate water content and geotherm in the upper mantle using electrical conductivity and seismic P-wave velocity distribution

Abstract

We propose the way to estimate water content and geotherm in the upper mantle using electrical conductivity and seismic P-wave velocity distribution. First we assume the dry (water content=0) condition, and estimate geotherms in the upper mantle using only electrical conductivity or P-wave velocity distribution, respectively (electircal geotherm and seismic geotherm). When the electrical and seismic geotherms are consistent with each other, we interpret the upper mantle is dry and the geothermal structure is electrical or seismic geotherm. If electrical and seismic geotherm is inconsistent, we introduce hydorgen dissolution. The hydrogen dissolution is estimated by electrical conductivity assuming that seismic geotherm reflects an appropriate upper mantle geotherm.