Identifikasi Struktur Geologi Bawah Permukaan Menggunakan Data Gayaberat Satelit dan Analisis Densitas Kelurusan

Fachyesi, Adelya Syawjesil (2022) Identifikasi Struktur Geologi Bawah Permukaan Menggunakan Data Gayaberat Satelit dan Analisis Densitas Kelurusan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Struktur kelurusan di permukaan dapat mencerminkan fenomena yang ada di bawah permukaan. Efek bawah permukaan ini berlaku jika asal kelurusan dikendalikan oleh struktur geologi seperti patahan dan rekahan. Penelitian ini bertujuan untuk melakukan interpretasi struktur geologi bawah permukaan berdasarkan analisis anomali medan gravitasi satelit dan kelurusan berdasarkan DEM Suttle Radar Topography Mission (SRTM). Kelurusan geologi digunakan untuk mengetahui area yang memiliki densitas kelurusan yang tinggi dan kemana arah dominannya. DEM SRTM yang berupa hillside diekstraksi kelurusan dan didapatkan sebaran densitas kelurusan pada area penelitian. Analisis struktur bawah permukaan dilakukan menggunakan metode gaya berat. Data yang digunakan berupa data gravity acceleration dari GGMPlus2013 dengan luas area pengukuran 91,7 km2 yang mencakup sebagian wilayah Kabupaten Batang hingga Pekalongan. Data gravitasi satelit yang telah terkoreksi oleh anomali latitude dan anomali udara bebas, dilakukan koreksi Bouguer dan koreksi terrain untuk menghitung anomali bouguer lengkap dan difilter Tilt Derivative (TDR). Kontur TDR didigitasi untuk mendapatkan arah kelurusan yang ada di bawah permukaan. Metode gayaberat dan densitas kelurusan sama-sama menunjukkan nilai densitas batuan dan densitas kelurusan yang lebih besar di bagian selatan dibandingkan di bagian utara daerah penelitian. Densitas batuan di sisi selatan lebih tinggi dibandingkan di utara selaras seiring kenaikan elevasi yang diindikasikan sisi utara merupakan tempat terendapkan lapukan batuan di sisi selatan yang dibawa oleh aliran sungai. Densitas kelurusan permukaan pada citra DEM SRTM bervariasi penyebarannya namun kebanyakan densitas kelurusan yang tinggi cenderung berada di sisi selatan. Berdasarkan analisis kelurusan data DEM dan data gayaberat telah didapatkan informasi tentang arah struktur dominan daerah penelitian berarah NW-SE, WNW-ESE dan NNW-SSE yang selaras dengan struktur geologi regional daerah penelitian.
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Lineaments on the surface can reflect phenomena that exist below the surface. This subsurface effect applies if the origin of the lineament is controlled by geological structures such as faults and fractures. This study aims to interpret the subsurface geological structure based on the analysis of satellite gravity field anomalies and lineaments based on the DEM Suttle Radar Topography Mission (SRTM). Geological lineaments are used to determine areas that have a high lineament density and where the dominant direction is. The SRTM DEM in the form of hillside was extracted straightly and obtained the straightness density distribution in the study area. Analysis of the subsurface structure was carried out using the gravity method. The data used is in the form of gravity acceleration data from GGMPlus2013 with a measuring area of 91.7 km2 which covers a part of Batang to Pekalongan Regency. Satellite gravity data which has been corrected by latitude anomaly and free air anomaly, performed Bouguer correction and terrain correction to calculate the complete bouguer anomaly and filtered by Tilt Derivative (TDR). The contour of the TDR is digitized to get the straightness below the surface. The gravity and lineament density methods both show higher rock density and lineament density values in the southern part than in the northern part of the study area. The density of rock on the south side is higher than on the north in line with the increase in elevation which indicates that the north side is where weathered rock on the south side is carried by river flows. The surface straightness density in the SRTM DEM image varies in distribution but most of the high straightness density tends to be on the south side. Based on the lineament analysis of DEM data and gravity data, information about the dominant structure direction of the study area is NW SE, WNW-ESE and NNW-SSE which are in line with the regional geological structure of the study area.

Item Type:	Thesis (Other)
Additional Information:	RSGf 551.8 Fac i-1 2022
Uncontrolled Keywords:	DEM SRTM, Densitas Kelurusan, Gayaberat, Lineament Density, Gravity
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	- Davi Wah
Date Deposited:	14 May 2024 06:50
Last Modified:	14 May 2024 06:56
URI:	http://repository.its.ac.id/id/eprint/107936

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