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Gunawati Gunawati
Department Of Physics, FMIPA Universitas Syiah Kuala, Darussalam, Aceh, Indonesia 23111
Physics

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Pseudogravity Transformation of Total Magnetic Field Anomaly Data in Bur Ni Geureudong, Bener Meriah Fhelisia Yolanda; Nazli Ismail; Gunawati Gunawati
Journal of Aceh Physics Society Volume 7, Number 3, September 2018
Publisher : PSI-Aceh

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Transformasi pseudogravitasi terhadap data anomali medan magnetik total telah dilakukan pada kawasan Bur Ni Geureudong. Data medan magnetik total diukur pada satu lintasan sepanjang 31 km. Anomali medan magnetik total diperoleh setelah koreksi diurnal dan koreksi IGRF terhadap data terukur.  Hasil transformasi menunjukan bahwa variasi data pseudogravitasi sepanjang lintasan sangat berhubungan dengan struktur dan jenis formasi batuan yang dilintasi. Fluktuasi nilai pseudogravitasi di Pante Raya (Lampahan) hingga kaki Bur Ni Geureudong menunjukan adanya koneksi dengan manifestasi panas bumi di kawasan tersebut. Nilai anomali pseudogravitasi rendah berkisar 2,25 mGal hingga 4,20 mGal diperkirakan bahwa daerah tersebut memiliki batuan dengan nilai densitas yang rendah pada formasi Silih Nara (Qvns) dan pada formasi Enang-enang (Qvee). Anomali pseudogravitasi yang melewati kawasan Wih Pesam dan Kompleks Bur Ni Geureudong menunjukkan adanya patahan. Patahan normal tersebut merupakan jalur mengalirnya fluida keluar ke permukaan.Pseudogravity transformation of total magnetic field anomalies data have been done in Bur Ni Geureudong, Bener Meriah, Aceh. The observation area covered along 31 km length of profile. The measured data were corrected by diurnal and IGRF corrections. The pseudogravity anomaly data show some agreements with structures and rock formations faund along the profile. Variations of the pseudogravity data at Pante Raya to Bur Ni Geureudong are connected to geothermal manifestations aroud the areas. Minimum pseudogravity values along the profile are influenced by low density rocks at Silih Nara’s Formation (Qvns) and Enang-enang’s Formation (Qvee). The change of pseudogravity vaules at Wih Pesam and Bur Ni Geuredong areas are cuased by faults. Those normal faults are path of flowing fluid out to the surface.Keywords: Bur Ni Geureudong geothermal field, total magnetic field anomaly, pseudogravity transformation
Qualitative Interpretation of Total Magnetic Field Anomaly Data Reduction Transfprmation to The Poles in Weh Island Kendek Limbong; nazli ismail; Gunawati Gunawati
Journal of Aceh Physics Society Volume 7, Number 2, May 2018
Publisher : PSI-Aceh

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Telah dilakukan penelitian menggunakan metode magnetik di Pulau Weh, Provinsi Aceh. Data medan magnetik total diukur menggunakan instrumen Proton Precission Magnetometer (PPM). Titik pengukuran berjumlah 195 yang meliputi Pulau Weh. Data medan magnetik total selanjutnya dilakukan koreksi diurnal dan koreksi International Geomagnetic Reference Field (IGRF) untuk menghasilkan data intensitas anomali medan magnetik total. Data anomali medan magnetik total selanjutnya ditransformasi reduksi ke kutub. Pola kontur intensitas anomali medan magnetik total hasil transformasi reduksi ke kutub digunakan untuk mengidentifikasi struktur bawah permukaan Pulau Weh. Pola kontur intensitas anomali medan magnetik total hasil reduksi ke kutub memiliki kesesuaian dengan peta pola kelurusan Sesar Sumatera di Pulau Weh. Arah pola kontur intensitas anomali medan magnetik total hasil reduksi ke kutub juga memiliki kesesuaian dengan arah patahan-patahan yang ada di Pulau Weh.Survey of magnetic method has been done in Weh Island, Aceh Province. Total magnetic field data were acquired using Proton Precision Magnetometer instrument. 195 stations were measured on the Weh Island that cover about 156,3 km2. The total magnetic field data were corrected by diurnal and International Geomagnetic Reference Field corrections in order to obtain total magnetic field anomaly data. The total magnetic field anomaly data were transformed to the pole since the data were measured at low lattitude geomagnetic area. The contour patterns of the total magnetic field anomaly reduced to the pole were used to identify the Weh Island's subsurface structures. The contour patterns are in agreement with the map of the Sumatera Fault on Weh Island. Both maps show NW-SE structures dominated the area those are corresponded to the local faults. Keywords: magnetic method, field anomaly intensity, pole, contour patterns, Weh IslandDaftar Pustaka Blakely, Richard J. 1996. Potential Theory In Gravity and Magnetic Applications. Cambridge University Press, Cambridge.Dirasutisna, S dan Hasan A. R. 2005. Geologi Panas Bumi Jaboi, Sabang, Provinsi Aceh Nanggroe Darussalam. Pemaparan Hasil Kegiatan Lapangan Subdit Panas Bumi 2005. Indonesia, Volume. 1: 1-6.Fernandez-Blanco, David, Philippon, Melody, von Hagke, Christoph. 2016. Structure and kinematics of the Sumatran Fault System in North Sumatra (Indonesia), Tectonophysics, doi: 10.1016/j.tecto.2016.04.050.Howell, L. E. 2010. Characterizing shallow intrasedimentary faults using magnetic depth estimation methods: Preliminary results of a high-resolution aeromagnetic survey at the San Luis Basin, south-central Colorado. Thesis. Bachelor of Arts degree from Carleton College, Minnesota.Indratmoko, P., Nurwidyanto M. I., dan Yulianto T. 2009. Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY dengan Metode Magnetik. Jurnal Berkala Fisika. Vol. 12, No. 4 (1410–9662): 153-160.Jain, Sudhir. 1988. Total Magnetic Field Reduction –The Pole or Equator? A Model Study. Canadian Journal of Exploration Geophysics, Vol. 24 No. 2: 185-192.Rahmad, B dan Ilahude, D. 2011. Pola Anomali Magnet dan Nilai Susceptibilitas dari Batuan Dasar Pada Pemetaan Geologi dan Geofisika di Perairan Teluk Bone Sulawesi Selatan. Jurnal Geologi Kelautan. Vol. 9. No. 13: 13-22.Telford, W. M., Geldart L. P. Dan Sheriff R. E. 1990. Applied Geophysics Second Edition. Cambridge University Press, Cambridge.
Co-Authors Fhelisia Yolanda Kendek Limbong Nazli Ismail Nazli Ismail