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<![CDATA[Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia ]]>
<![CDATA[Santoso, Nono Agus]]>;
<![CDATA[Iqbal, Mochamad]]>;
<![CDATA[Kadja, Grandprix Thomryes Marth]]>
<![CDATA[ Indonesian Journal on Geoscience Vol 7, No 3 (2020) ]]>
Publisher : <![CDATA[Geological Agency ]]>
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DOI: 10.17014/ijog.7.3.267-272
<![CDATA[DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.]]>
<![CDATA[Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia ]]>
<![CDATA[Santoso, Nono Agus]]>;
<![CDATA[Iqbal, Mochamad]]>;
<![CDATA[Kadja, Grandprix Thomryes Marth]]>
<![CDATA[ Indonesian Journal on Geoscience Vol 7, No 3 (2020) ]]>
Publisher : <![CDATA[Geological Agency ]]>
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DOI: 10.17014/ijog.7.3.267-272
<![CDATA[DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.]]>
<![CDATA[Peninjauan Ulang Kedalaman Akuifer Menggunakan Metode Resistivitas 1D di Desa Gayau, Kabupaten Pesawaran ]]>
<![CDATA[Antosia, Risky Martin]]>;
<![CDATA[Putri, Intan Andriani]]>;
<![CDATA[Farduwin, Alhada]]>;
<![CDATA[Irawati, Selvi Misnia]]>;
<![CDATA[Santoso, Nono Agus]]>
<![CDATA[ Jurnal Abdi Masyarakat Indonesia Vol 2 No 2 (2022): JAMSI - Maret 2022 ]]>
Publisher : <![CDATA[CV Firmos ]]>
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DOI: 10.54082/jamsi.309
<![CDATA[Kegiatan pengabdian kepada masyarakat (PkM) telah dilakukan di desa Gaya, kecamatan Padang Cermin, kabupaten Pesawaran, provinsi Lampung. Permasalahan yang dialami desa tersebut adalah sarana penampungan air yang sudah dibuat tidak optimal digunakan karena sumur bor yang dimiliki, kondisi airnya sering kering. Sarana tersebut diperuntukkan bagi warga desa ketika musim kemarau tiba. Tim PkM mengajukan suatu pendekatan dari segi kerekayasaan geofisika untuk mengatasi permasalahan tersebut, berupa peninjauan kembali kedalaman akuifer sumur bor desa. Pendekatan tersebut menggunakan metode resistivitas 1D. Metode ini bertujuan untuk mengetahui lapisan batuan bawah permukaan bumi dengan dilihat dari distribusi nilai resistivitas terhadap kedalaman. Ada 3 titik pengukuran di sekitar sumur desa tersebut dengan posisi sumur berada di antara ketiga titik tersebut. 1 titik memiliki bentangan 400 m dan 2 titik yang lain sepanjang 600 m. Hasil analisis dari metode resistivitas 1D menjelaskan bahwa estimasi jenis batuannya berupa endapan alluvium, lempung tufaan, batu pasir tufaan, kerakal/ kerikil, dan lava andesit. Akuifer berada pada batu pasir tufaan atau kerakal/kerikil. Hasil analisis juga memberikan informasi bahwa posisi dan kedalaman sumur tidak berada pada akuifer. Dengan demikian, memberikan rekomendasi perlu adanya pengeboran ulang. Kemudian tim juga memberikan gambaran bahwa ada 2 posisi yang cocok untuk dibor beserta dengan kedalamannya.]]>
<![CDATA[INVERSI DATA GEOLISTRIK MENGGUNAKAN PARTICLE SWARM OPTIMIZATION: STUDI KASUS DESA GAYAU ]]>
<![CDATA[Alhada Farduwin]]>;
<![CDATA[Risky Martin Antosia]]>;
<![CDATA[Intan Andriani Putri]]>;
<![CDATA[Nono Agus Santoso]]>;
<![CDATA[Selvi Misnia Irawati]]>
<![CDATA[ Jurnal Geofisika Eksplorasi Vol 7, No 2 (2021) ]]>
Publisher : <![CDATA[Engineering Faculty Universitas Lampung ]]>
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DOI: 10.23960/jge.v7i2.118
<![CDATA[Desa Gayau yang terletak di Kecamatan Padang Cermin, Kabupaten Pesawaran sering mengalami kekeringan air pada saat musim kemarau sehingga perlu dilakukannya pengukuran geolistrik untuk mengidentifikasi keberadaan lapisan akuifer air tanah. Pada penelitian ini konfigurasi yang digunakan adalah Schlumberger dengan panjang bentangan MN/2 sebesar 1, 5, 10, dan 20 meter. Sedangkan panjang bentangan AB/2 sebesar 6 hingga 300 meter. Pada tahapan inversi data VES, kami menggunakan algoritma Particle Swarm Optimization (PSO) untuk memperoleh nilai parameter resistivitas dan ketebalan lapisan. Algoritma ini dipilih karena cepat menuju konvergen dan relatif stabil. Hasil dari inversi ini diperoleh bahwa lapisan akuifer pertama berada pada kedalaman 21.4 - 52.1 meter dengan litologi batupasir berbutir halus dengan sisipan tufa Lapisan akuifer kedua berada pada kedalaman 52.1-70 meter dengan litologi breksi. Pada kedalaman 70 meter diinterpretasikan sebagai akuifer air tanah, namun memiliki debit yang kecil. Hal ini disebabkan karena litologi lapisan berupa breksi, dasit dan lava basal dari Formasi Hulusimpang. Sistem aliran air tanah pada lapisan ini merupakan sistem media pori yang berakibat pada debit rendah dan waktu pengisian kembali lapisan air tanah relatif lama.]]>
<![CDATA[SUBSURFACE SURVEY OF CISARUA LAMPUNG HOT SPRINGS USING GEOCHEMICAL AND GRADIO-MAGNETIC METHOD ]]>
<![CDATA[Reza Rizki]]>;
<![CDATA[Wijayanti Ashuri]]>;
<![CDATA[Rendra Aditya Hakim]]>;
<![CDATA[Nono Agus Santoso]]>
<![CDATA[ Jurnal Geofisika Eksplorasi Vol 8, No 1 (2022) ]]>
Publisher : <![CDATA[Engineering Faculty Universitas Lampung ]]>
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DOI: 10.23960/jge.v8i1.176
<![CDATA[The subsurface survey was carried out in Cisarua Hot Springs, South Lampung. Cisarua Hot Springs has a neutral pH and a temperature of about 44 °C. A combination of geochemical and gradio-magnetic methods was used in this research. This research identifies the characteristics of the Cisarua Hot Springs, estimates reservoir temperature, and creates a subsurface model to determine the hot fluid distribution in the study area. According to the geological data, the manifestation of these hot springs correlates with the Lampung-Panjang Fault. The geochemical results show that this type of hot springs fluid is bicarbonate water, and the reservoir temperature is estimated to be around 160 °C. The low gradio-magnetic anomaly is correlated with the distribution of subsurface hot water flow, according to the 3D model of the gradio-magnetic method. The distribution of subsurface hot fluids is in the middle to the eastern part of the research area.]]>
<![CDATA[INVESTIGASI AIR TANAH BERDASARKAN NILAI RESISTIVITAS DI DUSUN JATISARI, KABUPATEN LAMPUNG SELATAN ]]>
<![CDATA[Andri Yadi Paembonan]]>;
<![CDATA[Purwaditya Nugraha]]>;
<![CDATA[Nono Agus Santoso]]>;
<![CDATA[Ruhul Firdaus]]>;
<![CDATA[Gestin Mey Ekawati]]>;
<![CDATA[Virgian Rahmanda]]>;
<![CDATA[Felik Destian Putra Amijaya]]>
<![CDATA[ Jurnal Geofisika Eksplorasi Vol 7, No 2 (2021) ]]>
Publisher : <![CDATA[Engineering Faculty Universitas Lampung ]]>
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DOI: 10.23960/jge.v7i2.117
<![CDATA[Air tanah adalah sumber air tawar terbesar yang tersedia. Air tanah ini sangat penting untuk kehidupan manusia maka dari itu perlu adanya identifikasi zona air tanah yang potensial sebagai salah satu solusi untuk krisis air bersih. Namun pada sebagian daerah sangat sulit untuk menemukan air tanah yang baik karena disebabkan oleh kondisi geologi yang kompleks. Penelitian ini bertujuan untuk mendapatkan informasi keberadaan air tanah dari variasi nilai resistivitas bawah permukaan dengan menggunakan metode Vertical Electrical Sounding (VES) di wilayah Dusun Jatisari, Desa Jatimulyo, Kecamatan Jati Agung, Lampung Selatan. Keberadaan air tanah umumnya memiliki nilai resistivitas rendah hingga sedang. Oleh karena itu, hasil dari penelitian ini akan sangat membantu masyarakat dalam mengetahui kedalaman zona jenuh air (akuifer) untuk mendapatkan air bersih. Dari hasil yang diperoleh terlihat bahwa air tanah dengan rentang nilai resistivitas 10 – 35 Ohm.m berada pada kedalaman yang berbeda-beda. Pada titik VES PKM_S1, PKM_S2, dan PKM_S3 lapisan akuifer berada pada kedalaman 7.5 m, sedangkan titik VES PKM_S4 berada pada kedalaman 36 m, dan titik VES PKM_S5 berada pada kedalaman 8.5 m.]]>
<![CDATA[Geochemical Compositions and Magnetic Susceptibility of Soils from Different Origins: A Case Study in South Lampung, Indonesia ]]>
<![CDATA[Nono Agus Santoso]]>;
<![CDATA[Mochamad Iqbal]]>;
<![CDATA[Grandprix Thomryes Marth Kadja]]>
<![CDATA[ Indonesian Journal on Geoscience Vol 7, No 3 (2020) ]]>
Publisher : <![CDATA[Geological Agency ]]>
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DOI: 10.17014/ijog.7.3.267-272
<![CDATA[DOI:10.17014/ijog.7.3.267-272The study of rock weathering into soil is very important in geophysics. The geochemical and magnetic characteristics of soil were investigated in South Lampung using magnetic susceptibility and X-ray Fluorescence (XRF) measurements to identify the rock origin of the soil. The samples consisted of three soil types, those are granite soil, tuff soil in front of ITERA (Institut Teknologi Sumatra, South Lampung), and tuff soil inside ITERA. The tuffs (in front of and inside ITERA) and granite were taken in and around ITERA. The result showed that granite had the highest magnetic susceptibility value, while tuff soil in front of ITERA had the highest FeO content. Each sample can be distinguished by magnetic susceptibility and FeO content to prove that it can be used as a tool to distinguish the rock origin of soil.]]>
<![CDATA[STRATIGRAFI SUSEPTIBILITAS MAGNETIK SINGKAPAN EMBUNG E SEBAGAI ACUAN INTERPRETASI BAWAH PERMUKAAN DI INSTITUT TEKNOLOGI SUMATERA ]]>
<![CDATA[Nono Agus Santoso]]>;
<![CDATA[M Rafif Pascaloa]]>;
<![CDATA[Ahmad Zaenuddin]]>
<![CDATA[ Jurnal Geosaintek Vol 8, No 1 (2022) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j25023659.v8i1.11442
<![CDATA[Reference in interpretation is very important. We cannot always rely on the Telford table because each region has different physical parameters. The purpose of this study was to create a magnetic susceptibility stratigraphy of the Embung E outcrop with the hope that it could be used as a reference for subsurface interpretation at the Sumatran Institute of Technology (ITERA). The results obtained that the Embung E outcrop has a magnetic susceptibility stratigraphy consisting of soil, tuff and tuffan clay. Sequentially the magnetic susceptibility of the soil is about 5 – 90 × 10-8m3/kg, tuff is about 1-10 × 10-8m3/kg and the tuff clay is about 5 – 80 × 10-8m3/kg. This result can be used as a reference for interpretation because it has been correlated with geological observations of rocks in the field.]]>
<![CDATA[Penerapan Persamaan Trend Surface Analysis untuk Pemisahan Anomali Residual dan Regional pada Data Gayaberat ]]>
<![CDATA[Purwaditya Nugraha]]>;
<![CDATA[Nono Agus Santoso]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 5 No. 2: October 2021 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v5i2.14023
<![CDATA[The separation of regional anomalies and residual anomalies in gravity data is an important part in interpreting gravity data. This process aims to obtain gravity anomalies that have been associated with exploration targets. The Trend Surface Analysis method is a mathematical approach to the earth field that can be used to separate maps into regional components and local components. The application of this method into gravity data can be used to separate regional anomalies and residual anomalies. The process of processing the trend surface analysis method can be done using Microsoft Excel. This method is tested first on synthetic gravity data, the purpose of this test is to determine the performance of the trend surface analysis method in performing anomaly separation. Based on the test results of the trend surface analysis method on synthetic gravity data, it was found that this method was quite good at separating regional anomalies and residual anomalies. This is evidenced by the anomalous pattern that is already the same between the regional gravity anomaly resulting from the separation of the anomaly using the trend surface analysis method and the regional anomaly resulting from synthetic data. The same anomaly pattern can also be seen in the residual anomaly resulting from the separation of the anomaly using the trend surface analysis method with the residual anomaly resulting from synthetic data. The application of the trend surface analysis method to field data has been carried out by producing regional anomalies and residual anomalies. This method is very good at separating regional anomalies and residual anomalies, especially in regional anomalies located at deep depths.Pemisahan anomali regional dan anomali residual pada data gayaberat merupakan bagian penting dalam melakukan interpretasi data gayaberat. Proses ini bertujuan untuk mendapatkan anomali gayaberat yang sudah berasosiasi dengan target eksplorasi. Metode Trend Surface Analysis merupakan teknik pendekatan matematika pada bidang kebumian yang dapat digunakan untuk memisahkan peta kedalam komponen regional dan komponen lokal. Penerapan metode ini ke dalam data gayaberat dapat digunakan untuk memisahkan anomali regional dan anomali residual. Proses pengolahan metode trend surface analysis dapat dilakukan dengan menggunakan microsoft excel. Metode ini diuji terlebih dahulu pada data gayaberat sintetis, tujuan pengujian ini adalah untuk mengetahui performa metode trend surface analysis dalam melakukan pemisahan anomali. Berdasarkan hasil pengujian metode trend surface analysis pada data gayaberat sintetis didapatkan bahwa metode ini cukup baik dalam memisahkan anomali regional dan anomali residual. Hal ini dibuktikan pada pola anomali yang sudah sama antara anomali gayaberat regional hasil pemisahan anomali metode trend surface analysis dengan anomali regional hasil data sintetis. Pola anomali yang sama juga dapat dilihat pada anomali residual hasil pemisahan anomali metode trend surface analysis dengan anomali residual hasil data sintetis. Penerapan metode trend surface analysis pada data lapangan telah dilakukan dengan menghasilkan anomali regional dan anomali residual. Metode ini sangat baik dalam memisahkan anomali regional dan anomali residual terutama pada anomali regional yang berada pada kedalaman dalam]]>
<![CDATA[Basaltic Lava Characteristic in Goa Pandan Area, Sukadana, East Lampung: Inferences from Stratigraphy and Petrography Analysis ]]>
<![CDATA[Happy Christin Natalia Sirait]]>;
<![CDATA[Bilal Al Farishi]]>;
<![CDATA[Nono Agus Santoso]]>;
<![CDATA[Andreas Maruli Pakpahan]]>;
<![CDATA[Hissy Ijitiha Sari]]>;
<![CDATA[Angga Jati Widiyatama]]>;
<![CDATA[Risky Martin Antosia]]>
<![CDATA[ Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 2 (2023): JGEET Vol 08 No 02 : June (2023) ]]>
Publisher : <![CDATA[UIR PRESS ]]>
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DOI: 10.25299/jgeet.2023.8.2.12118
<![CDATA[The presence of extensive basalt formations in East Lampung has its own attractions in the field of geology, particularly the presence of Goa Pandan as a lava cave and tourist attraction in East Lampung. The presence of basalt lava in the southern part of the South Sumatra Basin has drawn attention to the presence of this lava, but detailed research on the characteristics of the lava and its formation process is still very rare. This study aims to determine the eruption period of the basalt lava and magma evolution process based on the correlation between lava stratigraphy and petrography analysis. Field observations show a lava sequence that forms Goa Pandan. Each lava sequence is characterized by autobreccia and vesicular structures on the surface. In addition, the presence of columnar joints, sheeting joints, massive lava, and other additional structures indicate the characteristics of low-viscosity basalt lava. The presence of mineral structures and abundance under the microscope clearly shows the magma formation process when basalt lava flowed on the surface. Resorption-overgrowth of plagioclase and pyroxene minerals indicates an open system when basalt lava flowed on the surface. In addition, the presence of zoning and patching in plagioclase minerals indicates that magma variability is influenced by temperature. The documentation of this lava stratigraphy can serve as a basis for further understanding of magma characteristics and formation processes. There is still much geological work that can be done in the research area to get a detailed picture of the evolution process of magma and the presence of basalt lava in this area.]]>
