2-D INTERPRETATION OF MINAMIKAYABE MT DATA SET BY THE CONTROLLED RANDOM SEARCH TECHNIQUE

Within the MT-DIW3 project of the comparison of various MT Interpretat ion techniques, the controlled random search procedure was applied to the 2-D interpretation of the MT data from the Minamikayabe MT polygon in Japan. Three NE-SW profiles together with one perpendicular profil e were 2-D modelled, simultaneously for both polarizations of the MT f ield. Although the 2-D approximation seems to be rather far from the r eal resistivity conditions, we could obtain relatively consistent inte rpretation results particularly for data within the short period range , up to 1 s. Better fit was achieved for apparent resistivities than f or phases. For all NE-SW profiles, a near-surface conductive body is i ndicated below the central part of the polygon. At both sides of this body two deeper conductive zones are obvious. As for the perpendicular profile kbs06, a large conductive zone is required below the SE marg in of the profile.