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Irawati, Selvi Misnia
Geophysical Engineering, Institut Teknologi Sumatra (ITERA) Jalan Terusan Ryacudu, Lampung Selatan 35365, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Physics Public Health

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Journal : Jurnal Geofisika

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Analisis Tensor Fase dan Pemodelan 2D Data Magnetotellurik Dahlila, Dea; Irawati, Selvi Misnia; Paembonan, Andri Yadi
Jurnal Geofisika Vol 22 No 1 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i1.563

Abstract

Salah satu metode geofisika untuk mengetahui bawah permukaan bumi adalah metode magnetotellurik yang memanfaatkan sumber alami berupa medan magnet bumi dari medan listrik dan variasi medan magnet. Namun, data yang diperoleh dari lapangan masih dipengaruhi oleh noise atau distorsi yang akan menutupi dimensionalitas sebenarnya dari struktur bawah permukaan, sehingga dapat mengakibatkan kesalahan dalam melakukan interpretasi. Oleh karena itu perlu dilakukan analisis tensor fase untuk mengidentifikasi struktur bawah permukaan yang tidak dipengaruhi distorsi galvanik. Berdasarkan hasil yang diperoleh daerah penelitian memiliki dimensionalitas 2D dengan arah geo-electrical strike N1750E berarah Utara Barat Laut hingga Tenggara. Hasil inversi 2D menunjukkan bahwa resistivitas rendah 1-10 Ωm diidentifikasi sebagai zona alterasi atau clay cap yang berupa batuan sedimen yang berada kedalaman ~1.5 km dimana zona alterasi ini memiliki kemenerusan ke arah timur laut. Pada resistivitas 200-500 Ωm diidentifikasikan sebagai basal berpori. Pada resistivitas 50-70 Ωm diidentifikasikan sebagai riolit yang berasosiasi dengan fluida geotermal.
Identifikasi dan Pemodelan 2D Zona Akuifer Daerah Buffalo River Dengan Menggunakan Data Audiomagnetotelluric Irawati, Selvi Misnia; Amin, Fadhlan amin; Paembonan, Andri Yadi
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.646

Abstract

Water is one of the important components in life on earth. The water source that is widely used now is groundwater. Groundwater is water that is below the surface and occupies cavities in the geological layer. This layer is called the aquifer layer. Groundwater exploration from shallow to very deep depth targets is an option for water availability.the study area is in the watershed of Buffalo, Arkansas. The buffalo river area has the potential for groundwater with a very deep depth. The depth of groundwater is very deep it is a problem to use geophysical exploration methods that are commonly carried out such as geoelectricity. Estimating aquifer layers is a problem that can be solved using audiomagnetotelluric (AMT) methods, especially aquifer layers at depths of more than 100 meters. Hence the need for this method to achieve targets and lithology at such depths. The use of the AMT method with a frequency range of 1 Hz – 10,000Hz which can reach depths of more than 1000 meters is one of the solutions to the problem of estimating very deep targets. AMT data rotated towards geoelectrical strike by N75oE. AMT modeling used using 2D inversion, the type of inversion is Non Linear Conjugate Gradient. Based on the results of modeling and interpretation, the formations arranged in the study area consist of the Bloyd formation, Hale formation, Boone formation, Everton formation and Ordovician formation. Layers that have potential as aquifer layers are obtained at low resistivities of 1-100 Ωm, are at depths of 0 - 500 meters with lithology arranged in the Bloyd formation and Hale formation. The formation is composed of several types of rocks, namely sandstone and limestone
Co-Authors Adilla, Rifa Prima Agus Laesanpura Airlangga, Feby Alutsyah Luthfian Amin, Fadhlan amin Andika, Putu Pradnya Andri Yadi Paembonan Antosia, Risky Martin Asido Saputra Sigalingging Atsani, Ahmad Rozali Cahyanto, Muhammad Hashfi Dahlila, Dea Edy Wijanarko Faidah, Puti Athiyah Farduwin, Alhada Fernanda, Leonardo Handoyo Handoyo Hendra Grandis Hidayat Hidayat Jaya, Muhammad Rendi Junian, Wahyu Eko Lita Maharani M. Strack, Kurt Maharani, Lita Mahendra, Merizki Ade Manurung, Sarah Merizki Ade Mahendra Nathania, Edlyn Yoadan Nugraha, Purwaditya Pahri, Pahri Purwaditya Nugraha Putri, Intan Andriani Rizki Wulandari Rumansah, Raka Putra Pratama Santoso, Nono Agus Saragi, Ibrani Uli Sigalingging, Asido Saputra Sinuhaji, Dwi Putri Meisya br Sitio, Angelica Noviani Sitorus, Dorlensa Wibowo, Andy Setyo