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<![CDATA[VOLTMETER DESIGN BASED ON ADS1115 AND ARDUINO UNO FOR DC RESISTIVITY MEASUREMENT ]]>
<![CDATA[Antosia, Risky Martin]]>
<![CDATA[ JTERA (Jurnal Teknologi Rekayasa) Vol 5, No 1: June 2020 ]]>
Publisher : <![CDATA[Politeknik Sukabumi ]]>
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DOI: 10.31544/jtera.v5.i1.2019.73-80
<![CDATA[One part of the geoelectric method is DC (Direct Current) resistivity measurement. Physical parameters measured by the system are the current and potential difference. From these two parameters, the resistance value is obtained based on Ohm?s law. Based on the current-potential electrodes configuration in the DC resistivity measurement, there is the possibility of contact between the potential-current electrodes and also the position of the potential electrodes that can be exchanged. Thus, an auto-range Voltmeter is needed which can measure the potential difference with the order of mV up to hundreds of volts and can measure negative potential difference value (reversed polarity). This research aims to build a Voltmeter prototype using ADS1115 (namely ADC with 16-bit resolution) and Arduino Uno, which can be applied in DC resistivity measurement. In this system, there is internal resistance and switch. The internal resistance is around 2.4 M?, arranged into a voltage divider circuit to be able to measure the maximum potential input around 1,600 V. The switch function is to set the measurement mode (as auto-range), which is set by Arduino Uno. Furthermore, ADS1115 uses a differential measurement method to be able to measure a negative potential difference. Based on the results of tests on several resistor components with an adjustable voltage source, the Voltmeter is good at measuring the potential difference in resistor values below 10 K? with a confidence level of around 97%.]]>
<![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[Pemanfaatan Metode Geolistrik 2 Dimensi dalam Mengidentifikasi Kemenerusan Lapisan Air Tanah di Dusun IID, Desa Jatimulyo, Kecamatan Jati Agung, Kabupaten Lampung Selatan ]]>
<![CDATA[Antosia, Risky Martin]]>;
<![CDATA[Putri, Intan Andriani]]>;
<![CDATA[Pesma, Rhahmi Adni]]>;
<![CDATA[Erlangga, Mokhammad Puput]]>;
<![CDATA[Ekawati, Gestin Mey]]>
<![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.324
<![CDATA[Sebagian warga yang tinggal di sekitar Dusun IID, Desa Jatimulyo, Kecamatan Jati Agung, Kabupaten Lampung Selatan; sering mengalami kekeringan air tanah pada sumur bor yang dimilikinya. Kedalaman sumur bor tersebut sekitar 10 meter, padahal ada sumur bor dengan kedalaman yang sama, kuantitas airnya banyak. Untuk mengatasi permasalahan ini, tim pengabdian kepada masyarakat menggunakan metode geolistrik untuk mengidentifikasi kemenerusan lapisan air tanah di dusun tersebut. Metode geolistrik 2 dimensi diaplikasikan di lokasi pengukuran agar dapat memberikan informasi persebaran nilai tahanan jenis listrik di area tersebut (secara horizontal dan vertical) sepanjang bentangan 210 meter dengan jarak antar elektroda sebesar 14 meter. Hasil pengolahan data menunjukkan bahwa lapisan air tanah di sekitar lokasi memiliki kuantitas air tanah yang berbeda, dilihat dari persebaran nilai resistivitasnya (tahanan jenis listrik). Informasi warga terkait kedalaman air tanah dan kuantitas air tanah, cocok dengan penampang resistivitas. Bagi warga yang tinggal di sebelah Barat, dapat memanfaatkan air tanah hanya dengan kedalaman sumur bor sekitar 10 meter. Namun, sebagai rekomendasi bagi warga di sebelah Timur, tim menyarankan untuk membuat sumur bor dengan kedalaman lebih dari 25 meter.]]>
<![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[Identifikasi Lapisan Akuifer Menggunakan Metode Seismik Refraksi di Desa Jatimulyo, Kecamatan Jati Agung, Kabupaten Lampung Selatan ]]>
<![CDATA[Rhahmi Adni Pesma]]>;
<![CDATA[Mokhammad Puput Erlangga]]>;
<![CDATA[Intan Adiani Putri]]>;
<![CDATA[Risky Martin Antosia]]>;
<![CDATA[Ruhul Firdaus]]>;
<![CDATA[Gestin Mey Ekawati]]>
<![CDATA[ Jurnal Geofisika Eksplorasi Vol 6, No 2 (2020) ]]>
Publisher : <![CDATA[Engineering Faculty Universitas Lampung ]]>
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DOI: 10.23960/jge.v6i2.66
<![CDATA[An initial subsurface survey to predict the aquifer is important to avoid the unprospect drill location and getting groundwater with the right discharge. In this study, prediction of the aquifer was carried out using the seismic refraction method in Jatimulyo Village, Jati Agung District, South Lampung Regency. The data was collected on October 6, 2019 using the SUMMIT X One seismic tool with 24 Geophones. The first break data from p-wave travel time is processed and interpreted using the Hagiwara method. Interpretation results show that there are three layers of subsurface lithology in the study area. The weathering layer was found at 2 m to 3.5 m depth with average velocity of 360 m/s. The second layer is dry sand with a velocity of 890 m/s at a depth of 2 m to 8 m. The third layer with a 2300 m/s velocity is a mixture of clay rock and saturated sand at depths of more than 8 m. As a comparison there is resistivity distribution data on the same measurement line in the study area. The overall interpretation shows that at a depth of 12 m with saturated clay sedimentary rock as a prospect of aquifer in this study area.]]>
<![CDATA[Voltmeter Design Based on ADS1115 and Arduino Uno for DC Resistivity Measurement ]]>
<![CDATA[Risky Martin Antosia]]>
<![CDATA[ JTERA (Jurnal Teknologi Rekayasa) Vol 5, No 1: June 2020 ]]>
Publisher : <![CDATA[Politeknik Sukabumi ]]>
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DOI: 10.31544/jtera.v5.i1.2019.73-80
<![CDATA[One part of the geoelectric method is DC (Direct Current) resistivity measurement. Physical parameters measured by the system are the current and potential difference. From these two parameters, the resistance value is obtained based on Ohm’s law. Based on the current-potential electrodes configuration in the DC resistivity measurement, there is the possibility of contact between the potential-current electrodes and also the position of the potential electrodes that can be exchanged. Thus, an auto-range Voltmeter is needed which can measure the potential difference with the order of mV up to hundreds of volts and can measure negative potential difference value (reversed polarity). This research aims to build a Voltmeter prototype using ADS1115 (namely ADC with 16-bit resolution) and Arduino Uno, which can be applied in DC resistivity measurement. In this system, there is internal resistance and switch. The internal resistance is around 2.4 MΩ, arranged into a voltage divider circuit to be able to measure the maximum potential input around 1,600 V. The switch function is to set the measurement mode (as auto-range), which is set by Arduino Uno. Furthermore, ADS1115 uses a differential measurement method to be able to measure a negative potential difference. Based on the results of tests on several resistor components with an adjustable voltage source, the Voltmeter is good at measuring the potential difference in resistor values below 10 KΩ with a confidence level of around 97%.]]>
<![CDATA[A COMBINED METHOD OF 1D AND 2D RESISTIVITY FOR GROUNDWATER LAYER ESTIMATION AT A FARMING AREA IN REJOMULYO VILLAGE ]]>
<![CDATA[Risky Martin Antosia]]>;
<![CDATA[Muhammad Ramdan]]>
<![CDATA[ Spektra: Jurnal Fisika dan Aplikasinya Vol 8 No 1 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 1, April 2023 ]]>
Publisher : <![CDATA[Program Studi Fisika Universitas Negeri Jakarta ]]>
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DOI: 10.21009/SPEKTRA.081.04
<![CDATA[The groundwater depends on when it is available, more in the rainy and less in the dry seasons. Fluctuation in water availability is a significant problem in activities continuously requiring large amounts of water, such as agriculture. Hence, it is necessary to increase the number of water resources to meet the community's needs. Therefore, the groundwater layer zone was estimated as an initial study at the dry farmland in Rejomulyo village, Jati Agung district, South Lampung, using a combined method between the 1D resistivity method of the Schlumberger array and the 2D form of the Wenner configuration. Each sounding point and the 2D line have a maximum stretch length of 300 m. The 1D outcome correlates to the 2D data processing result to produce a subsurface lithology model. As a result, the research area has three primary layers with three rock types. The first layer has a resistivity value of less than 20 Ωm and is identified as tuffaceous clay. Then the second layer with a resistivity range of 60–66 Ωm is tuffaceous sand, this rock which is referred to as the groundwater layer with a depth of 11-40 m. The last layer has a high resistivity value of 120–141 Ωm as tuff. Based on the results of 3D visualization, the groundwater layer in the study area spreads to the southeast with a confined aquifer type. This targeted rock layer can be utilized for groundwater production.]]>
<![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.]]>
<![CDATA[IDENTIFIKASI PERSEBARAN BATUAN ANDESIT SEBAGAI BAHAN UTAMA AGREGAT MENGGUNAKAN METODE GEOLISTRIK PROFILING KONFIGURASI WENNER-ALPHA ]]>
<![CDATA[Dimas Setiawan]]>;
<![CDATA[Risky Martin Antosia]]>;
<![CDATA[Purwaditya Nugraha]]>
<![CDATA[ Jurnal Geosaintek Vol 9, No 2 (2023) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j25023659.v9i2.16986
<![CDATA[Penelitian ini dilakukan untuk mengidentifikasi persebaran batuan andesit sebagai bahan utama agregat menggunakan metode geolistrik profiling dengan konfigurasi elektroda Wenner-Alpha. Lokasi penelitian dilakukan di Desa Tarahan, Kecamatan Katibung, Kabupaten Lampung Selatan karena daerah tersebut memiliki potensi andesit yang melimpah secara geologi. Akuisisi data di daerah tersebut difokuskan pada daerah “andesit 01” dengan luas area sekitar 10.000 m2 sebanyak 3 lintasan, masing-masing sepanjang 100 m dengan spasi elektroda 5 m. Kemudian, ada satu lintasan tambahan diletakan pada singkapan di luar daerah tersebut. Lalu, terdapat juga sampel batuan tufa dan andesit yang dilakukan uji nilai resistivitas di laboratorium. Pengukuran singkapan dan sampel batuan dilakukan untuk mengonfirmasi batas nilai resistivitas pada penampang 2D. Berdasarkan profil resistivitas pada singkapan, andesit memiliki nilai resistivitas lebih dari 173,5 Ωm. Sedangkan, hasil pengujian sampel menunjukkan bahwa nilai resistivitas batu andesit sebesar kurang lebih 171 Ωm dan batu tufa sekitar 131 Ωm. Maka, hampir di seluruh area studi dipenuhi dengan batuan andesit dan menyebar ke segala arah walaupun ada sedikit sebaran batuan tufa ke arah selatan mulai kedalaman 8-10 m. Dengan demikian, potensi andesit tersebut layak diproduksi untuk keperluan domestik]]>
<![CDATA[Identification of Aquifer, Ground Water-Bearing Rock, using Vertical Electrical Sounding (VES): East Lampung Case Study ]]>
<![CDATA[Intan Andriani Putri]]>;
<![CDATA[Risky Martin Antosia]]>;
<![CDATA[Alhada Farduwin]]>;
<![CDATA[Reza Rizki]]>;
<![CDATA[Yudha Styawan]]>;
<![CDATA[Sillak Hasiany]]>
<![CDATA[ Journal of Multidisciplinary Academic Vol 7, No 1 (2023): Science, Engineering and Social Science Series ]]>
Publisher : <![CDATA[Penerbit Kemala Indonesia ]]>
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<![CDATA[A one-dimensional geo-electrical method using Vertical Electrical Sounding (VES) has been carried out to model lithology and identify an aquifer, a water-bearing rock, in East Lampung to provide the water needs of the poultry breeding industry (PT. X) that is going to be established in the near future. Two VES points had been surveyed using Schlumberger electrode configuration to achieve good depth penetration and good vertical resolution. Geophysical modeling is not unique, overcoming this issue could be done using a global inversion method. A global inversion technique called Particle Swarm Optimization (PSO) was performed to create more reliable subsurface lithology, resulting in around 5 – 11% errors. The PSO algorithm deployed here took 1.000 particle numbers with ω=0.8; αl=1.8; and αg=2. The result shows that the study area’s lithology consists of Tuff, Sandy Tuffaceous, and Shaley Tuff. Sandy Tuffaceous is identified as a confining aquifer zone. There are two potential aquifer zones, Aquifer I and Aquifer II. Aquifer II has more potential as water resources of the industry due to its thickness, moreover, it is topped by impermeable Shaley tuff that prevents local climate effects such as rain that could decrease water quality.]]>
