Jirasanghirun W.Boonchaisuk S.Mahidol University2023-10-122023-10-122023-01-015th Asia Pacific Meeting on Near Surface Geoscience and Engineering, NSGE 2023 (2023)https://repository.li.mahidol.ac.th/handle/20.500.14594/90369Sinkholes are one type of geological hazard particularly in karst terrain. The two-dimensional Electrical Resistivity Tomography were used to discover a subsurface cavities at Mahaxay District, Khammouane Province, Lao PDR. The 2D cross section models of 9 survey lines were inverted using the RES2DINV program Furthermore, RES2DMOD Program is used to investigate and test cavities of various sizes, forms, depths and connectivity. Some water-filled cavities were identified. The stable and unstable cavities were classified by using L=17 ×d from Waltham et al. (2005). The 4 unstable area were reported as the possible areas of future subsidence.Earth and Planetary SciencesConference PaperSCOPUS10.3997/2214-4609.2023780652-s2.0-85171381168