AN AUDIOMAGNETOTELLURIC VIEW OF THE ATERA FAULT

We made audiomagnetotelluric sounding to image the subsurface structur e across the Atera fault, which is a 66 km long active strike-slip fau lt in central Japan. A major feature of the resistivity model is exist ence of two dipping conductors at 0.5-2.0 km depth: one dipping southw est and the other northeast. These imply fractured zones, created eith er by strike slip movements or by vertical ones. An audiomagnetotellur ic imaging is suited for mapping subsurface fractures zones in active fault regions.