Abstrak

Baca Juga : INTERPRETASI DATA ANOMALI MEDAN MAGNETIK TOTAL PADA KAWASAN POTENSI PANASBUMI IE JU (CUT AFRIYANA SARY, 2015) ,

Baca Juga : INTERPRETASI DATA ANOMALI MEDAN MAGNETIK TOTAL PADA LAPANGAN PANAS BUMI BURNI GEUREUDONG (Taufiq Arifan, 2016) ,

i ie ju berkisar antara -1700 hingga 500 nt. data anomali medan magnetik kemudian diplotkan kedalam software surfer 11 untuk menghasilkan kontur anomali medan magnetik. untuk menginterpretasikan struktur bawah permukaan, hasil kontur anomali magnetik disayat melewati bidang anomali dengan panjang lintasan 345 meter dan digunakan software mag2dc untuk menghasilkan pemodelan 2d. dari hasil pemodelan 2d menggunakan software mag2dc, menunjukkan bahwa daerah penelitian terdiri dari 4 lapisan dengan kedalaman 0 hingga 300 meter. lapisan tersebut yaitu soil, breksi tufaan terubah, andesit, breksi vulkanik tua. pada permodelan juga didapatkan zona patahan dangkal yang diduga sebagai patahan sesar turun. kata kunci : metode magnetik, anomali medan magnetik, pemodelan, seulawah agam ie ju abstract geophysical research by using magnetic method was done in order to obtain subsurface structure of geothermal prospect area ie ju, meurah, aceh besar. the data measured using gem system proton precission magnetometer (ppm) unit. the measurement of total magnetic field was taken at 63 points with spacing of 50 meters. ie ju area has an inklination angle -5.209 and declination angle -0.875 which has total magnetic field range between 41400 to 43600 nt. the magnetic data were processed by applying diurnal correction and igrf correction (international geomagnetic reference field) to produce a magnetic anomaly data. the values of magnetic anomalies in ie ju geothermal area is -1700 until 500 nt. magnetic anomaly contours have been generated from the anomaly data which os plotted to surfer 11 program. to interpret the subsurface structures, the results of magnetic anomaly contours are sliced through the anomaly field with a length of 345 meters and the profiles are converted into the data (.dat) file to be run on mag2dc program and it is continued with modelling based on results of the determined profiles. from the result of 2d modelling using software mag2dc, showed that the research area consist of 4 subsurface structure from 0 – 300 meters depth. the layers are soil, altered breccia-tuff, andesite, breccia-vulcanic. the model was obtained the fault shallow zone estimated as fault down zone. kata kunci : magnetic method, magnetic anomaly, modelling, geothermal, seulawah agam ie

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