Identifikasi Akuifer Menggunakan Metode Automatic Audio-Frequency Magnetotelluric (ADMT) Di Wilayah Kabupaten Nganjuk Bagian Selatan

Setyantama, Muhammad Hazami (2026) Identifikasi Akuifer Menggunakan Metode Automatic Audio-Frequency Magnetotelluric (ADMT) Di Wilayah Kabupaten Nganjuk Bagian Selatan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kabupaten Nganjuk bagian Selatan merupakan wilayah dengan dinamika pemanfaatan air tanah yang tinggi akibat perkembangan sektor pertanian dan pemukiman, namun informasi mengenai karakteristik dan kedalaman akuifer di wilayah ini masih terbatas. Penelitian ini bertujuan untuk mengidentifikasi karakteristik lapisan akuifer serta memodelkan litologi bawah permukaan menggunakan metode Automatic Audio-Frequency Magnetotelluric (ADMT). Pengukuran dilakukan pada 20 titik lintasan yang tersebar di 9 kecamatan dengan kedalaman investigasi mencapai 300 meter menggunakan instrument ADMT 300-ET2, dan hasilnya dikorelasikan dengan data electric well logging dari tujuh titik bor di sekitar wilayah penelitian. Hasil penelitian menunjukkan bahwa nilai resistivitas semudi wilayah Selatan Kabupaten Nganjuk bervariasi antara 0,1 Ωm hingga 111 Ωm. Dari 20 lintasan pengukuran , sebanyak 18 titik teridentifikasi memiliki potensi akuifer pada kedalaman 15 hingga 300 meter, dengan litologi penyusun berupa pasir tufaan, tufa pasir, dan pasir kerikil yang berselang seling dengan lapisan lempung dan tufa breksi sebagai aquitard. Sebaran akuifer di wilayah penelitian mencerminkan pengaruh sistem sedimentasi vulkanik dan alluvial yang berkembang pada Cekungan Air Tanah Brantas.
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Southern Nganjuk Regency is a region with high groundwater utilization dynamics due to agricultural and residential development. However, information on the characteristics and depth of aquifers in this region is still limited. This study aims to identify the characteristics of aquifer layers and model subsurface lithology using the Automatic Audio-Frequency Magnetotelluric (ADMT) method. Measurements were conducted at 20 track points spread across nine districts with an investigation depth of up to 300 meters using the ADMT 300-ET2 instrument. The results were correlated with electric well logging data from seven drill points around the study area. The results showed that the resistivity values in the southern region of Nganjuk Regency vary between 0.1 Ωm and 111 Ωm. Of the 20 measurement tracks, 18 points were identified as having aquifer potential at depths of 15 to 300 meters, with lithologies consisting of tuffaceous sand, sandy tuff, and gravelly sand alternating with layers of clay and tuff breccia as aquitards. The distribution of aquifers in the research area reflects the influence of volcanic and alluvial sedimentation systems that developed in the Brantas Groundwater Basin.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Akuifer, ADMT, Resistivitas, Nganjuk, Air Tanah, Magnetotelurik. Aquifer, ADMT, Resistivity, Nganjuk, Groundwater, Magnetotelluric
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Hazami Setyantama
Date Deposited:	23 Jul 2026 03:32
Last Modified:	23 Jul 2026 03:32
URI:	http://repository.its.ac.id/id/eprint/136323

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