Pemodelan 3D Data Gayaberat untuk Identifikasi Bawah Permukaan : Studi Kasus Mata Air Umbulan, Kabupaten Pasuruan

Mawardi, Bagoes Idcha (2020) Pemodelan 3D Data Gayaberat untuk Identifikasi Bawah Permukaan : Studi Kasus Mata Air Umbulan, Kabupaten Pasuruan. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mata Air Umbulan merupakan salah satu mata air terbesar yang berada di Indonesia dengan debit hingga 3.500 liter/detik yang terletak di wilayah Desa Umbulan, Kecamatan Winongan, Kabupaten Pasuruan. Penelitian terdahulu telah dilakukan menggunakan metode konfigurasi Wenner – Schlumberger menyimpulkan bahwa Mata Air Umbulan muncul karena kontak antara lapisan dengan permeabilitas tinggi dan lapisan kedap yang memotong permukaan tanah (Contact Spring). Pada penelitian yang sama, hasil penampang resistivitas menunjukan zona resistivitas tinggi yang terletak di bawah Mata Air Umbulan. Zona yang belum dijelaskan secara detail oleh peneliti terdahulu, ini menarik minat peneliti untuk melakukan penelitian lebih lanjut. Melengkapi penelitian terdahulu, dilakukan pemodelan inversi 3D pada data gayaberat daerah Mata Air Umbulan. Penelitian ini bertujuan untuk mengetahui persebaran nilai anomali daerah penelitian dan gambaran bawah permukaan berdasarkan distribusi densitas batuan secara tiga dimensi (3D). Hasil Pengolahan data Gayaberat daerah Umbulan menghasilkan Peta Anomali Bouguer dengan persebaran nilai anomali tinggi 152 – 154,9 mGal menempati +55% dari luas area penelitian. Anomali Bouguer sedang dengan nilai 151 – 152 mGal menempati +22% dari luas area penelitian. Anomali Bouguer rendah dengan nilai 149 – 151 mGal menempati +23% dari luas area penelitian. Hasil interpretasi model 3D, pada nilai densitas 2,78 – 3,00 g/cm^3 diinterpretasikan sebagai intrusi magma. Terobosan magma yang membentuk tiga intrusi pada sisi sebelah Selatan, Timur, dan Utara dengan perkiraan di bawahnya memiliki kantong magma yang sama.
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Umbulan Springs is one of the largest springs in Indonesia with a debit of up to 3,500 liters/second located in the Umbulan Village area, Winongan District, Pasuruan Regency. Previous research has been carried out using the Wenner-Schlumberger configuration method to conclude that the Umbulan Spring arises due to contact between the layer with high permeability and the impermeable layer that cuts through the soil surface (Spring Contact). From the same study, the results of the resistivity cross-section show a high resistivity zone located below the Umbulan Spring. Zones that have not been discussed in detail by the published researchers, this attracts researchers to conduct further research. Completing the initial research, 3D inversion modeling was carried out in the gravity data of the Umbulan Springs. This study aims to determine the distribution of anomaly values in the study area and subsurface assessment based on the distribution of three-dimensional density (3D). Results Processing the gravity of the Umbulan area results in the Bouguer Anomaly Map with the distribution of high anomaly values with 152 – 154.9 mGal allocation + 55%. Medium Bouguer Anomaly with a value of 151 - 152 mGal allocation + 22% of the area of the study. Bouguer anomaly is low with a value of 149-150 mGal allocation + 23% of the area of the study. The results of the interpretation of the 3D model, at a density value of 2.78 – 3.00 g / cm^3, are interpreted as magma intrusion. The magma breakthrough that forms three intrusions on the south, east, and north sides with the debate below has the same magma chamber.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	3D Gravity Modeling, Inversion, Umbulan Spring, Pemodelan 3D Gayaberat, Inversi, Mata Air Umbulan
Subjects:	Q Science Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	BAGOES IDCHA MAWARDI
Date Deposited:	24 Aug 2020 10:03
Last Modified:	24 Aug 2020 10:03
URI:	http://repository.its.ac.id/id/eprint/78810

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