Question

The definition true p orosity is given by vp+vp'/(vc+vp+vp') show how p-b/p is derived from vp+vp'/(vc+vp+vp')

Answer 1

1] Seismic V P , V S , and V P /V S structure is imaged across the Yellowstone hot spot swell, including the hot spot track where magmatism occurred at the eastern Snake River Plain $6–10 m.y. B.P. Data are teleseismic P and S travel time delays that have been corrected for the well-understood upper mantle anisotropy and crustal structure. Amplitude variations in the imaged structures are 6.2%, 11.2%, and 8% for V P , V S , and V P /V S , respectively. The dominant structure is a zone which extends beneath the Snake River Plain to a depth of $190 km that is high in V P /V S and low in V P and V S . The physical state of the upper mantle is inferred by assuming isostasy, using the volume of melt segregated from the mantle that is inferred from estimates of magma addition to the crust, and using relations that scale

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