arcgis 10.1 - shortest distance between a raster and another raster

i am using arcgis 10.1

i want to calculate the shortest distance between a raster and another raster. i have a bathymetric raster and an underlying fault plane raster. for each bathy raster cell, i need to know the shortest distance to the underlying fault plane.

the bathymetry and the fault plane rasters are not planar nor horizontally level.

i am not trained in python and hope there is an existing tool that i could use (though i could learn python if i need to).