IDENTIFICATION OF LIQUEFACTION POTENTIAL IN KOTO TANGAH SUBDISTRICT OF PADANG CITY USING SCHLUMBERGER CONFIGURATION GEOELECTRIC METHOD

Nelma  Yeti; Akmam Akmam; Hamdi Hamdi; Nofi Yendri  Sudiar

doi:10.24036/89zdna28

Authors

Nelma Yeti Department of Physics, Padang State University, Padang Author
Akmam Department of Physics, Padang State University, Padang Author
Hamdi Department of Physics, Padang State University, Padang Author
Nofi Yendri Sudiar Department of Physics, Padang State University, Padang Author

DOI:

https://doi.org/10.24036/89zdna28

Keywords:

Liquefaction, Geoelectric, Schlumberger, Koto Tangah, Resistivity

Abstract

The earthquake of September 30 2009, showed that Lubuk Buaya Sub-district, Koto Tangah Sub-district, Padang City is an earthquake-prone area, and the geology of the area consisting of sandstone and alluvium deposits is a contributing factor to liquefaction. Research on liquefaction potential using the Schlumberger configuration geoelectric method has never been conducted in this area, although initial observations showed indications of liquefaction in buildings and infrastructure. Therefore, this study aims to determine the description of soil layers that have the potential to experience liquefaction based on the value of rock specific resistance in Lubuk Buaya Village. This research used a descriptive field approach, conducted from February to June 2025 with four measurement tracks, each 155 meters long and 5 meters electrode spacing. Using the Automatic Resistivity System (ARES) instrument. The data obtained include electric current strength (I), potential difference (V), and electrode spacing which are processed to determine the value of geometry factor and apparent density resistance (ρa). Data interpretation was carried out using the Smoothness Constraint Least Squares inversion method with the help of Res2dinv software to produce true specific gravity and depth. The results showed that the subsurface soil layers in Lubuk Buaya Village have a high potential to experience liquefaction. This potentially liquefiable soil layer consists of water-saturated sand, gravel, and sandy silt, with low resistivity values. Liquefaction potential zones were identified at depths of 5 to 25 meters with a thickness of 20 meters.

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