RESUMEN
In order to precisely locate active faults in Phetchabun basin, measured data started with a remote sensing and digital elevation model (DEM) methods in order to find traces of potentially active faults and potential sites for field investigations. Geomorphological and geological field investigations were subsequently conducted according to remote sensing method and map interpretations in order to identify suitable sites for gravity survey and 2D-3D electrical resistivity tomography. From this dataset, the gravity models reveal subsurface structures of density contrast and can identify vertical fault plane. The ERT inversion images show zones of high and low resistivity interpreted as fault plane. Integrated three geophysical surveys can provide useful information of the active faults, which have implications on paleo-earthquake investigation in Phetchabun basin.
RESUMEN
In order to identify potential zones for clay mineral (kaolinite) in Ranong province, Thailand, ten 2D ERT survey lines were deployed across potential site. The data were collected using the IRIS Syscal Pro Plus multi-electrode imaging system with internal switchbox and an array of 48 steel electrodes. The Dipole-Dipole configuration was utilized with electrode separations of 10 m. The Res2DInv software was used to process the data. Images for the resistivity survey are presented as 2D cross section of resistivity profile. The data were interpreted by comparing with geology of the area and based on the available lithological borehole information.