Geophysics and Geophysical Exploration ISSN:1229-1064(Print) 2384-051X(Online) 지구물리와 물리탐사

We analyzed response patterns of test field data acquired with new small loop electromagnetic (EM) systemusing three-dimensional (3D) electromagnetic modeling code. The size and shape of a conductor was adopted asexperimental parameters for EM modeling to understand influencing factors of the response patterns due to a metallicobject on the seafloor. Obtaining the responses for four models of difference sizes and shapes through 3D EM modeling,we confirmed that the shape of the object have a more critical factor on the response pattern than size. We also calculated“ppm” values with respect to different altitudes of the sensor and source frequencies. The modeling results show thatthe consistency of sensor altitude is important and imaginary part of ppm response is more sensitive than real part. Wealso visualized the contour map of the real and imaginary part of ppm value as a function of frequency and altitudeso that we can estimate proper altitude for source frequency band of our survey system. The results of this paper areanticipated to give proper parameters in survey construction for seafloor massive sulfide deposit.