ANALISIS INVERSI 2D METODE OCCAM UNTUK MEMODELKAN RESISTIVITAS BAWAH PERMUKAAN DATA MAGNETOTELLURIK

BUDIRAHARJO, SATRIO (2017) ANALISIS INVERSI 2D METODE OCCAM UNTUK MEMODELKAN RESISTIVITAS BAWAH PERMUKAAN DATA MAGNETOTELLURIK. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Program pengolahan data metode Magnetotellurik dikalangan mahasiswa, khususnya inversi 2D sangat jarang ditemukan. Pemodelan struktur resistivitas bawah permukaan menggunakan data Magnetotellurik umumnya saat ini menggunakan inversi 1D yang kemudian dilakukan pseudo-section terhadap resistivitas vertikal untuk menampilkan model dalam bentuk 2D. Untuk medium 2D solusi pemodelannya menjadi lebih kompleks, dikarenakan parameter resistivitas tidak hanya bervariasi terhadap kedalaman namun juga dalam dimensi lateral. Program TGMT2D yang dibuat menggunakan metode inversi Occam yang ditest dengan model sintetik hasil forward modelling, dengan resistivitas lapisan pertama hingga lapisan keempat adalah 50 ohm.m, 1ohm.m, 100 ohm.m dan 500 ohm.m. Dari hasil inversi yang dilakukan didapatkan nilai RMS error 5.15, dengan nilai resistivitas lapisan pertama hingga lapisan keempat adalah 32-79 ohm.m, 1.2-3.9 ohm.m, 2.5-79 Ohm.m, dan 32-200 ohm.m dengan menggunakan smoothing aspect ratio. ========================================================================================================= Magnetotelluric data processing, especially in 2D inversion is very rare to find in student level. Structural modelling subsurface in magnetotelluric method, generally using 1D modelling inversion which then using pseudo-section with vertical resistivity to built 2D section of subsurface resistivity. In medium 2D, the solution is to be different and make it more complex, it is because resistivity parameter not only different with depth but also affected by latera dimension. TGMT2D program is build by Occam inversion algorithm. To knowing the validity of the TGMT2D program, the model inversion result compared with synthetic model who built before in forward modelling. The resistivity parameter who build is consist of 4 layer, 50 Ohm m in first layer, 1 ohm.m in second layer, 100 Ohm.m in third layer, and 500 Ohm.m in fourth layer. The result of inversion Occam in TGMT2D program showing that 32 – 79 Ohm.m in first layer subsurface, 1.2 – 3.9 Ohm.m in second layer subsurface, 2.5 – 79 Ohm.m in third layer, and 32-200 Ohm.m in last layer. With 5.15 RMS error.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Inversi Occam 2D, Resistivitas, Magnetotellurik
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1318 Geothermal Power Plants
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > (S1) Undergraduate Theses
Depositing User: SATRIO BUD SATRIO BUDIRAHARJO
Date Deposited: 26 Jan 2017 01:30
Last Modified: 26 Jan 2017 01:30
URI: http://repository.its.ac.id/id/eprint/3287

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