ANALISIS DUGAAN JALUR SESAR LOKAL MENGGUNAKAN METODE MIKROTREMOR DI DESA TOTOGAN, KECAMATAN KARANGSAMBUNG, KABUPATEN KEBUMENNIM.: 22106020023Muhammad Faza Syaddad Ar-RafiauthorThe suspected presence of a local fault in Totogan Village, Karangsambung Subdistrict, Kebumen Regency, is believed to play a role in controlling subsurface geological conditions and soil dynamic characteristics in the study area. This study aims to identify wave source direction patterns based on H/V rotate analysis and to analyze the distribution of shear wave velocity (vs) as an indicator of the presence of geological structural zones. The methods used were microtremors with Horizontal to Vertical Spectral Ratio (HVSR) analysis and H/V rotate to obtain wave source direction patterns. The processed data were then used to construct a vs distribution model visualized in the form of a solid model and a solid fence diagram. Additionally, supporting data analysis, including lineaments and Fault Fracture Density (FFD), was conducted to strengthen the interpretation of subsurface geological structures. The results of the study indicate that the dominant direction of the wave source tends to be North–South, with an average azimuth of N 4.6° E, as well as several other directions such as East–West and Northeast–Southwest. The shear wave velocity (vs) values range from 153.03 m/s to 1495.90 m/s. Zones with vs values > 1200 m/s are found in the C–C’ section in the Northern part and again in the A–A’ section in the Southern part with a Northeast–Southwest orientation. Additionally, zones with vs values < 500 m/s were identified, appearing in the Western part of the study area along the B–B’ section and reappearing in the Eastern part along the E–E’ section with an East–West orientation. The results of integrating all methods indicate the presence of local fault zones influenced by the geological structure in the study area.530 Fisika2026-07-08UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS SAINS DAN TEKNOLOGIThesis