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All Journal BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains Jurnal Pendidikan Matematika (JUDIKA EDUCATION)
Syirojudin, M.
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Education Mathematics

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Identifikasi Jalur Sesar Aktif Menggunakan Analisis First Horizontal Derivative (FHD) dan Second Vertical Derivative (SVD) pada Data Gravitasi Ismoyo W, Tri; Adhi, M.Aryono; Syirojudin, M.; Sania, Ismi Rohmatus; Hasanuddin, Hasanuddin; Islam Masruri, Fakhrul
Jurnal Pendidikan Matematika : Judika Education Vol. 9 No. 2 (2026): Jurnal Pendidikan Matematika:Judika Education
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/k7d7yw85

Abstract

This study aims to delineate and characterize active fault lines in Sumedang Regency, West Java, which exhibits significant geological complexity resulting from the convergent tectonic processes between the Indo-Australian and Eurasian Plates, as well as its proximity to prominent regional fault systems such as the Lembang Fault. The investigation utilized the gravity method combined with derivative analysis to identify subsurface fault structures that potentially contribute to seismic hazards. Gravity data were collected using a Scintrex CG-6 gravimeter with an accuracy of 0.01 mGal, supplemented by the global gravity model GGMPlus and SRTM topographic data. The Complete Bouguer Anomaly (CBA) map was processed through First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) filtering techniques to enhance fault detection capability. Results from data processing and interpretation reveal linear patterns and anomaly points characterized by high FHD values and significant SVD anomalies along several cross-sectional lines. These patterns indicate the presence of active fault zones that align with regional geological trends and the distribution of seismic activity following the earthquakes at the end of 2023. This study concludes that the integration of the FHD and SVD methods on gravity data is effective in identifying active fault lines. The findings can serve as a fundamental basis for geological disaster mitigation and safer regional spatial planning.   Keywords: Gravity, FHD, SVD, Bouguer Anomaly, Active Fault
Delineasi Sebaran Sesar di Segmen Cihideung, Sesar Lembang Berdasarkan Metode Fault Fracture Density (FFD) Yosefa, Tristin; Supriyadi, Supriyadi; Syirojudin, M.; Setiawan, Yosi
BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains Vol. 9 No. 2 (2026): BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/21k2m135

Abstract

This study aimed to delineate the distribution of faults and fractures in the Cihideung Segment using the Fault Fracture Density (FFD) method based on high-resolution LiDAR topographic data from BMKG in 2024. The LiDAR-based Digital Elevation Model (DEM) data were processed into multi-azimuth hillshade images, followed by visual interpretation of morphological lineaments digitized as polylines. The density of lineament lengths was then calculated within specific grid units to generate an FFD map for identifying structural deformation zones. The results indicate several zones with high lineament density that follow the main trace of the Lembang Fault and its associated branches, particularly around Cihanjuang Rahayu, Cigugur Girang, Gudangkahuripan, and Pagerwangi. These zones are interpreted  as  areas  experiencing  the  most intensive deformation and therefore have important implications for spatial planning, earthquake hazard mitigation, and landslide risk management in the study area. Keywords: LiDAR, Fault Identification, Lineament, Tectonic Geomorphology, Drone, Digital Elevation Model
Co-Authors Adhi, M.Aryono Hasanuddin Hasanuddin Islam Masruri, Fakhrul Ismoyo W, Tri Sania, Ismi Rohmatus Setiawan, Yosi Supriyadi Supriyadi Yosefa, Tristin