ANALISIS PERLAPISAN BATUAN PADA ZONA GERAKAN TANAH MENGGUNAKAN METODE MAGNETIK DI DESA RATAMBA, KECAMATAN PEJAWARAN, BANJARNEGARANIM.: 22106020043Winni Nur LailliauthorGround movement is a frequent geological hazard in Banjarnegara Regency, Central Java. In 2025, Kaliireng Village experienced ground movement that damaged local infrastructure and residential areas. This phenomenon is suspected to be influenced by subsurface rock layering within the Kalibiuk Formation and Jembangan Volcanic Rocks. This study aims to determine the distribution of magnetic field anomalies and identify the constituent rocks in the ground movement zone using the magnetic method. Data acquisition was conducted using a Proton Precession Magnetometer (PPM) with a looping method across 49 measurement points at 75-meter intervals. The data underwent processing involving diurnal correction, International Geomagnetic Reference Field (IGRF) correction, anomaly separation, reduction to the pole, and upward continuation. Subsurface interpretation, based on magnetic susceptibility values and local geological information, was performed using 2D modeling. The results indicate that the distribution of magnetic field anomalies in the study area ranges from 3.0 to 346.7 nT, reflecting variations in subsurface rock layers. Interpretation of the 2D modeling indicates the presence of clayey soil with a susceptibility value of (5–7) × 10⁻⁵ SI (dominant at depths of 0–5.94 m in the Kalibiuk Formation and 0–3.8 m in the Jembangan Formation), clay with (1–1.5) × 10⁻⁵ SI (dominant at 1.2–50 m in the Kalibiuk Formation and 1.16–50 m in the Jembangan Formation), marl with (1.2–2) × 10⁻⁴ SI (dominant at 3.37–49.83 m in the Kalibiuk Formation and 4.21– 21.54 m in the Jembangan Formation), and andesite with (0.8–1) × 10⁻³ SI (dominant at 9.25–27.77 m in the Kalibiuk Formation and 14.92–44.8 m in the Jembangan Formation).530 Fisika2026-08-12UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS SAINS DAN TEKNOLOGIThesis