Joint Analysis of InSAR, ERT, and in-Situ Geological Survey in Landslide Prone Area: A Case in Laeya Village, North Buton Regency, Indonesia

Landslide investigation in Laeya Village of North Buton Regency, Indonesia, is necessary since this area frequently experiencing landslides. In study, we applied a joint analysis interferometric synthetic aperture radar (InSAR), electrical resistivity tomography (ERT), and in-situ geology observation. The objectives multidisciplinary study are: a) to estimate ground deformation through the InSAR method, b) estimation subsurface characteristics based on rocks, as well shape slip plane type landslide that resulted; c) identify surface conditions site from an survey. data Sentinel-1A acquired 2015 2017 were processed using Sentinel toolbox. collected utilizing electrodes array Wenner-Schlumberger configuration employing RES2DINV. survey involving observation elevation, slope, soil rock was also carried out area. method may slope material investigated sites with magnitude ranging -53 mm +55 mm. negative mark means subsidence positive uplift. ERT has successfully estimated existence saturated zones, clay layer acts plane, type. There are at least two types planes estimated, namely planar uneven curvature generate translational complex landslides, respectively. In-situ observations geological support results obtained methods.