<![CDATA[The Sentool plantation is situated on the slopes of Mt. Argopuro in Suci Village, Panti District, Jember Regency. This area, previously abandoned, has been transformed into a thriving coffee plantation. Flash floods and landslides in Panti District in 2006 and landslides in the Sentool Plantation in 2015 prompted a study of the subsurface structure, particularly concerning soil types and their stability towards landslide potency. This study combines in situ method using geoelectric resistivity and laboratory tests, including plasticity index (PI) and soil gradation tests. Geoelectric resistivity data acquisition was conducted on two lines using a Wenner-Schlumberger array, with a length of 150 m and a spacing of 5 m. Soil samples were taken at Line 2, namely at a distance of 40 m as sample 1 and 120 m as sample 2. Field research results using the Wenner-Schlumberger array of geoelectric resistivity method on Lines 1 and 2 in the Sentool Plantation show that the subsurface structure is dominated by silty clay and silty soils with resistivity (11.8 – 93.4) ?m and there are several intercalations of sand, gravel, or bedrock with higher resistivity. The plasticity index test results for sample 1 with a PI of 10.45% and sample 2 with a PI of 13.68% show that the soil layers are composed of silty clay silt with moderate plastic. The soil gradation analysis results also indicate that both soil samples are fine-grained (possibly silt) with grain sizes <0.075 mm. Both laboratory test results validate the geoelectric resistivity field research results, which show the dominance of clay soil with a reference internal friction angle (?) of 25° - 30°. The Sentool Plantation research area is characterized by silty clay soils, which may influence subsurface conditions relevant to landslide vulnerability.]]>
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