Farendra, Davin Yosza (2026) Analisis Anomali Gayaberat Pada Zona Land Subsidence Akibat Eksploitasi Air Tanah Di Kota Semarang Menggunakan Metode Second Vertical Derivative (SVD) Berdasarkan Data GGMPlus. Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 5016221076-Undergraduate_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
5016221076-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (6MB) | Request a copy |
Abstract
Kota Semarang merupakan salah satu kota pesisir di Indonesia dengan laju penurunan muka tanah (land subsidence) tertinggi, terutama pada kawasan dengan intensitas pemompaan air tanah yang tinggi. Eksploitasi air tanah berlebihan menyebabkan penurunan tekanan pori, peningkatan tegangan efektif, dan kompaksi lapisan akuifer sehingga memicu deformasi vertikal permukaan tanah. Penelitian ini bertujuan menganalisis distribusi anomali gayaberat bawah permukaan dan kesesuaian spasial metode Second Vertical Derivative (SVD) dengan zona penurunan muka tanah menggunakan data GGMPlus (3.380 titik, resolusi ~200 m) yang diolah melalui koreksi Bouguer, koreksi terrain (DEMNAS), pemisahan anomali regional-residual dengan bandpass filtering, dan metode SVD menggunakan operator Elkins (1951). Hasil pengolahan menunjukkan nilai Complete Bouguer Anomaly berkisar -0,7982 hingga 17,9743 mGal, anomali residual -2,6817 hingga 1,9409 mGal, dan SVD -1,50063 hingga 1,15919 mGal/km². Validasi terhadap peta geologi menunjukkan bahwa pola garis kontur nol SVD cenderung mengikuti arah batas struktur geologi regional, namun belum presisi terhadap batas formasi sesungguhnya. Integrasi dengan data deformasi InSAR (Aditiya & Ito, 2023) menunjukkan kesesuaian spasial hanya bersifat parsial di bagian utara kota dan tidak konsisten pada zona penurunan tertinggi (Pedurungan-Genuk). Penelitian ini menyimpulkan bahwa SVD berbasis GGMPlus berpotensi untuk delineasi awal struktur geologi regional-menengah, namun belum dapat diandalkan sebagai indikator tunggal jalur air tanah, sehingga diperlukan data resolusi lebih tinggi dan uji korelasi statistik pada penelitian lanjutan.
===========================================================================================================================
Semarang City is one of the coastal cities in Indonesia with the highest land subsidence rates, particularly in areas with intensive groundwater pumping. Excessive groundwater exploitation reduces pore pressure, increases effective stress, and triggers aquifer compaction, causing vertical surface deformation. This study analyzed subsurface gravity anomaly distribution and the spatial correspondence of the Second Vertical Derivative (SVD) method with subsidence zones using GGMPlus data (3,380 points, ~200 m resolution) processed through Bouguer correction, terrain correction (DEMNAS), regional-residual separation via bandpass filtering, and the SVD method using the Elkins (1951) operator. Results show Complete Bouguer Anomaly values of -0.7982 to 17.9743 mGal, residual anomalies of -2.6817 to 1.9409 mGal, and SVD values of -1.50063 to 1.15919 mGal/km². Validation against the geological map showed that the SVD zero-crossing contour generally follows the trend of regional geological boundaries, but lacks precise agreement with actual formation boundaries. Integration with InSAR deformation data (Aditiya & Ito, 2023) showed only partial spatial correspondence in the northern part of the city and no consistency in the highest-subsidence zone (Pedurungan-Genuk). This study concludes that GGMPlus-based SVD is useful for preliminary delineation of regional-to-medium-scale geological structures, but cannot yet serve as a standalone indicator of groundwater pathways; higher-resolution data and formal statistical correlation testing are needed for future research.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Penurunan Tanah, Air Tanah, GGMPlus, SVD, Gayaberat, Kota Semarang, Land Subsidence, Groundwater, Gravity, Semarang City |
| Subjects: | G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. G Geography. Anthropology. Recreation > GA Mathematical geography. Cartography > GA139 Digital Elevation Model (computer program) G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater. G Geography. Anthropology. Recreation > GB Physical geography > GB651 Subsidences (Earth movements) |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29202-(S1) Undergraduate Theses |
| Depositing User: | Davin Yosza Farendra |
| Date Deposited: | 04 Aug 2026 03:33 |
| Last Modified: | 04 Aug 2026 03:33 |
| URI: | http://repository.its.ac.id/id/eprint/142863 |
Actions (login required)
 |
View Item |