Karakteristik Kondisi Bawah Permukaan Area Manifestasi Panas Bumi Selogajah Dengan Metode Very Low Frequency Electromagnetic (VLF-EM)

Azizah, Rahmi (2022) Karakteristik Kondisi Bawah Permukaan Area Manifestasi Panas Bumi Selogajah Dengan Metode Very Low Frequency Electromagnetic (VLF-EM). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mata air panas Selogajah terletak di Bukit Selogajah, Lereng Utara Gunung Pandan, berada dalam kawasan zona Kendeng yang memiliki beberapa sesar aktif serta berbagai manifestasi panas bumi lain disekitarnya. Berdasarkan kondisi tersebut digunakan metode VLF-EM untuk mengidentifikasi karakteristik kondisi bawah permukaan di area Bukit Selogajah, Kecamatan Gondang, Kabupaten Bojonegoro. Sejauh ini belum ada studi dan penelitian intensif yang dilakukan untuk memetakan karakteristik kondisi bawah permukaan di sekitar mata air panas Selogajah sehingga metode VLF-EM ini diharapkan dapat menjadi acuan untuk membantu masyarakat sekitar dalam melakukan perencanaan pembangunan serta pengembangan wilayah di area tersebut. Akuisisi data dilakukan pada 6 lintasan di area mata air panas Selogajah dengan menggunakan instrumen T-VLF dan dilakukan pengolahan menggunakan beberapa proses filter, diantarnya filter NA-MEMD untuk mendekompoisisi data dan mereduksi noise. Berdasarkan hasil pengolahan 2D secara kualitatif menggunakan filter Karous-Hjelt didapatkan persebaran konduktivitas dengan kedalaman semu. Hasil yang didapatkan dari 6 Lintasan yang berorientasi Barat-Timur, menunjukkan adanya anomali konduktif yang terkonsentrasi dan mendominasi pada bagian Timur area studi, pada area tengah lintasan, dan sedikit muncul pada bagian Barat. Adapun interpretasi dari anomali konduktif diduga kuat merupakan lapisan batuan yang tersaturasi air berupa fluida hidrotermal dengan arah kepenerusan Tenggara-Barat Laut. Sedangkan anomali resistif pada area tersebut mengindikasikan adanya rekahan batuan yang memunculkan mata air panas Selogajah 1 dan Selogajah 2.
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The Selogajah hot spring is located on Selogajah Hill, North Slope of Mount Pandan, within the Kendeng zone which has several active faults and various other geothermal manifestations around it. Based on these conditions, the VLF-EM method was used to identify the characteristics of subsurface conditions in the Selogajah Hill area, Gondang District, Bojonegoro Regency. So far, no intensive studies and research have been conducted to map the characteristics of the subsurface conditions around the Selogajah hot springs, so that the VLF EM method is expected to be a reference to assist local communities in planning development and regional development in the area. Data acquisition was carried out on 6 tracks in the Selogajah hot spring area using the T-VLF instrument and processing using several filter processes, including the NA-MEMD filter to decompose data and reduce noise. Based on the results of qualitative 2D processing using the Karous-Hjelt filter, the conductivity distribution with apparent depth is obtained. The results obtained from 6 West-East oriented tracks, show a concentrated and dominant conductive anomaly in the eastern part of the study area, in the middle area of the track, and slightly appears in the western part. The interpretation of the conductive anomaly is strongly suspected to be a water-saturated rock layer in the form of hydrothermal fluid with a southeast-northwest direction. While the resistive anomaly in the area indicates the presence of rock fractures that gave rise to the Selogajah 1 and Selogajah 2 hot springs.

Item Type:	Thesis (Other)
Additional Information:	RSGf 622.159 Azi k-1 2022 3100022096895
Uncontrolled Keywords:	VLF-EM, NA-MEMD, Selogajah
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1199.5 Geothermal resources Q Science > QE Geology > QE601 Geology, Structural T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK351 Electric measurements.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Anis Wulandari
Date Deposited:	23 Sep 2025 04:49
Last Modified:	23 Sep 2025 04:49
URI:	http://repository.its.ac.id/id/eprint/128371

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