Liquefaction Potential Area Identification in Southern Bali Island Based on Ground Penetrating Radar, Geoelectricity and Borehole Data

The potential area of liquefaction in southern Bali Island has been identified by using ground penetrating radar, resistivity geoelectricity with dipole-dipole configuration, and borehole data. The research has been conducted in 16 GPR's sites, 12 geoelectricity lines, and 8 borehole points. The interpretations of GPR and geolectricity revealed the presence of sand-silt-clay with (5.00–23.6) Ωm resistivities at (0–5) meter depth and groundwater table with (0.265–17.1) Ωm at (0–7) meter depth. The measurement of sand diameter in Sanur, Sarangan, Tanjung Benoa and Tuban reveal that sandsilt-clay fraction which has < 20% fines are categorized as highly potential liquefaction.