SHALLOW SOIL LAYER CHARACTERIZATION USING THE ELECTRICAL RESISTIVITY TOMOGRAPHY FOR SHALLOW SUBSIDENCE POTENTIAL IN PRINGSEWU
DOI:
https://doi.org/10.23960/jge.v12i2.527Keywords:
Electrical Resistivity Tomography (ERT), Soil Characterization, Shallow Subsidence, Wenner Array, Weak ZoneAbstract
The study area is located in the Lampung Formation (QTI), which consists of pumiceous tuff, tuffaceous sandstone, and tuffite intercalations. These volcanic materials generally exhibit variable degrees of compaction, are porous, and have a relatively high water absorption capacity, thereby having the potential to form weak soil zones that may affect land stability and trigger land subsidence. Accordingly, this study was conducted to characterize shallow soil layers based on Electrical Resistivity Tomography (ERT) data and drilling results, as well as to identify shallow subsurface zones that may be susceptible to land subsidence in the study area. The study employed the Electrical Resistivity Tomography (ERT) method using the Wenner configuration along five survey lines, which were correlated with drilling data and soil sample observations. The inversion results show resistivity values ranging from 21.7 to 274 Ωm. Low-resistivity zones (<80 Ωm) identified within the shallow subsurface (0–3 m) are interpreted as relatively less compact materials based on the correlation with drilling observations and are considered potentially susceptible to shallow land subsidence. The correlation between ERT data and drilling results supports the interpretation of shallow soil layer characteristics. The findings of this study provide preliminary information for infrastructure development planning by identifying shallow subsurface zones that may be be susceptible to land subsidence. However, ground deformation and soil compressibility were not directly measured; therefore, the results should be interpreted as a preliminary assessment of subsidence susceptibility rather than evidence of active land subsidence.
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