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Earth, Planets and Space
Fig. 21 | Earth, Planets and Space

Fig. 21

From: Magma reservoir beneath Azumayama Volcano, NE Japan, as inferred from a three-dimensional electrical resistivity model explored by means of magnetotelluric method

Fig. 21

Bulk resistivity of two phases (hydrothermal fluid–rock) as a function of the hydrothermal fluid volume fraction (solid line). Hydrothermal fluid resistivity is assumed to be 0.1 or 0.3 Ωm. Rock resistivity is fixed at 1000 Ωm (see Fig. 19). The green, orange, and pink columns show percolation threshold porosity in effusive and explosive eruptions, and change point of permeability–porosity relationship, respectively. The red and green lines show the upper bounds of 67% and 90% CIR of the conductor (see Fig. 14b). The oblique pattern represents likely resistivity range at the Mogi inflation source location, assuming that the upper bound of CIR of the conductor restricts the lower bound of resistivity at the Mogi inflation source

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