Ajyad, Angger Muhammad (2025) Pemodelan 3D Struktur Bawah Permukaan Daerah Panas Bumi Dieng Berdasarkan Data Satelit GGMPlus. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Dataran Tinggi Dieng, Jawa Tengah, merupakan wilayah vulkanik aktif dengan
kompleksitas geologi tinggi yang ditandai oleh keberadaan intrusi batuan beku, patahan, dan
struktur bawah permukaan lainnya. Karakteristik ini menjadikan kawasan Dieng menarik untuk
dikaji menggunakan metode gravitasi. Meskipun metode gayaberat telah lama digunakan untuk
mendeteksi variasi densitas bawah permukaan yang berkaitan dengan struktur geologi, survei
terestris memerlukan sumber daya besar. Oleh karena itu, penelitian ini menggunakan data
gravitasi satelit GGMPlus sebagai pendekatan awal untuk mengidentifikasi struktur bawah
permukaan dan distribusi densitas secara regional. Data dianalisis melalui serangkaian koreksi
hingga diperoleh Anomali Bouguer Lengkap (CBA), yang selanjutnya dipisahkan menjadi
anomali regional dan residual menggunakan metode spektral dan upward continuation. Hasil
anomali residual kemudian dianalisis menggunakan turunan horizontal (FHD), turunan vertikal
kedua (SVD), serta interpretasi citra satelit untuk mengidentifikasi sesar. Pola kontras densitas
yang signifikan dengan arah dominan NW–SE mengindikasikan keberadaan struktur linier
utama. Pemodelan inversi 3D dengan metode Occam menunjukkan keberlanjutan vertikal zona
kontras densitas dari permukaan hingga kedalaman 3000 meter, dengan rentang densitas 1,85
3,84 gr/cm³. Temuan ini menunjukkan efektivitas penggunaan data gravitasi satelit untuk studi
awal sebelum dilakukan survei terestris yang lebih rinci.
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The Dieng Plateau in Central Java is an active volcanic region characterized by complex
geology, including intrusive igneous bodies, faults, and various subsurface structures. These
characteristics make the area highly suitable for gravity-based geophysical investigations.
Although gravity methods have long been used to detect subsurface density variations
associated with geological structures, terrestrial gravity surveys often require extensive
resources. Therefore, this study employs satellite gravity data from the GGMPlus model as a
preliminary approach to identify subsurface structures and regional density distribution. The
data were processed through a series of corrections to obtain the Complete Bouguer Anomaly
(CBA), which was then separated into regional and residual anomalies using spectral methods
and upward continuation filtering. The residual anomalies were further analyzed using the first
horizontal derivative (FHD), second vertical derivative (SVD), and satellite image
interpretation to identify fault zones. A significant density contrast pattern with a dominant
NW–SE orientation indicates the presence of major linear structures. Three-dimensional
inversion modeling using the Occam method revealed the vertical continuity of these density
contrasts from the surface down to a depth of 3000 meters, with density values ranging from
1.85 to 3.84 g/cm³. These findings highlight the effectiveness of satellite gravity data as an
initial exploration tool prior to more detailed terrestrial gravity surveys.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Gravitasi satelit, GGMPlus, inversi 3D, struktur geologi, panas bumi, Satellite gravity, GGMPlus, 3D inversion, geological structures, geothermal energy |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA169.6 Fault location (Engineering) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Angger Muhammad Ajyad |
| Date Deposited: | 01 Aug 2025 03:13 |
| Last Modified: | 01 Aug 2025 03:13 |
| URI: | http://repository.its.ac.id/id/eprint/124979 |
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