5:15 PM - 6:30 PM
[SEM35-P11] Shallow Resistivity Structure around the MTL Fault Zone (Izumi segment) deduced from the dense AMT observations
Keywords:Magnetotelluric, The Japan Median Tectonic Line Fault Zone, The dense observations
In order to delineate fine subsurface structure around these faults, we carried out audio-frequency magnetotellurics (AMT) measurements at 38 sites along a 5km profile perpendicular to the Gojodani and Shobudani faults in November, 2014. Relatively good quality MT responses were estimated at 37 sites. Resulting conventional two-dimensional inversion analyses, we obtained a high resolution two-dimensional resistivity model. To pick out robust properties of resistivity model, we developed a new procedure and applied to our data.
Obtained robust model is characterized by a conductive and two resistive zones. The conductive zone is interpreted to be the Shobudani sedimentary layer and a clear contrast is recognized inside the Shobudani layer just beneath the surface trace of the Gojodani fault.