JOINT INVERSION OF ELECTRICAL RESISTIVITY AND SEISMIC REFRACTION TOMOGRAPHY IN REDUCING INTERPRETATION AMBIGUITY

A single geophysical method is limited in providing adequate model accuracy and resolution for inversion of subsurface structure. Using multi-geophysical techniques with different sensitivity to subsurface structures can complement each other and obtain more relevant results. We numerically perform joint inversion of electrical resistivity tomography (ERT) and seismic refraction tomography (SRT). The joint inversion approach is used to detect horizontally layered sedimentary units. The result shows unclear and considerably merged layer interfaces for separate inversion of the ERT and SRT. However, jointly inverted results exhibit relatively improved layer structures, reducing model ambiguity. In addition, the numerical experiment shows the adequacy of regularization selection on model resolution.