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All Journal POSITRON JGE (Jurnal Geofisika Eksplorasi) Jurnal Geosaintek Journal of Geoscience, Engineering, Environment, and Technology JTERA (Jurnal Teknologi Rekayasa) Spektra: Jurnal Fisika dan Aplikasinya Jurnal Geosains dan Teknologi Journal of Multidisciplinary Academic Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Abdi Masyarakat Indonesia Jurnal Geosaintek Global Review of Tourism and Social Sciences
Antosia, Risky Martin
Department Of Geophysical Engineering, Sumatera Institute Of Technology, Jalan Terusan Ryacudu, Way Huwi, Jati Agung, Kabupaten Lampung Selatan, Lampung, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences

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A COMBINED METHOD OF 1D AND 2D RESISTIVITY FOR GROUNDWATER LAYER ESTIMATION AT A FARMING AREA IN REJOMULYO VILLAGE Antosia, Risky Martin; Ramdan, Muhammad
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 1 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 1, April 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.081.04

Abstract

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.
Analysis of Subsidence Hazards in Pandan Cave Area, Giri Mulyo Village, Marga Sekampung District, East Lampung using Analytical Hierarchy Process Bilal Al Farishi; Natalia, Happy Christin; Naufal, Rifqi Andi; Aganda, Riyanto Dedinta; Octafiani, Aulia; Hita Kirana; Depri; Pakpahan, Andreas Maruli; Sari, Hissy Ijitiha; Santoso, Nono Agus; Antosia, Risky Martin; Putri, Intan Andriani
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.16848

Abstract

Pandan Cave is a basalt lava cave which is a unique geological tourism area located in Giri Mulyo Village, Marga Sekampung District, East Lampung Regency, Lampung Province. This cave was formed when the lava flow cooled at the top because it was in contact with the cold atmosphere, while at the bottom it was still flowing. This uniqueness caused Pandan Cave to become one of the tourist attractions that was once crowded with tourists. However, the condition of this cave is still very natural which can lead to the risk of geological disasters such as subsidence which can endanger tourists, so it is necessary to research to minimize the occurrence of geological disasters in the area. This research was conducted by observing aerial photographs, collecting data directly in the field, and then processing it with the Analytical Hierarchy Process (AHP). Parameters used in this AHP method include lithology, vegetation, weathering, rock mass class, and cave roof thickness. The existence of subsidence in the study area is influenced by weathering (34%), vegetation (31%), thickness of the cave roof layer (16%), lithology (10%), and rock mass class (9%). Based on the overlay results for each parameter that has been weighted, the Pandan Cave tourism area is divided into three subsidence hazard zone classifications, that is low hazard zone with value of 0.28-0.44, medium hazard zone with range of 0.44-0.60, and high hazard zone with range of 0.60-0.75. Through the Analytical Hierarchy Process (AHP) method and overlay of each parameter used, the distribution of subsidence hazard zones in the study area was obtained.  The low threat zone of 27.57 ha is about 57.07% of the total research area, the medium threat zone is 15.86 ha or about 32.83% of the total research area, and the high threat zone is 4.88 ha or about 10. 10% of the total research area.
Pemanfaatan Instrumen PQWT dalam Pendugaan Air Tanah di Desa Gayau, Kabupaten Pesawaran, Provinsi Lampung Antosia, Risky Martin; Putri, Intan Andriani; Farduwin, Alhada; Santoso, Nono Agus; Irawati, Selvi Misnia; Nugraha, Purwaditya
Jurnal Abdi Masyarakat Indonesia Vol 4 No 4 (2024): JAMSI - Juli 2024
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54082/jamsi.1296

Abstract

Desa Gayau, Kabupaten Pesawaran, memiliki permasalahan bahwa sumur air tanah yang terdapat pada fasilitas air desa cepat mengalami kekeringan, padahal sumur tersebut memiliki kedalaman 80 m. Tim dari program studi Teknik Geofisika, Institut Teknologi Sumatera, telah melaksanakan kegiatan pengabdian kepada masyarakat (PkM) pertama pada pertengahan tahun 2021 menggunakan metode geolistrik/ resistivitas. Namun, hasilnya belum dapat memberikan kejelasan mengapa sumur cepat kering. Kemudian, pada tahun 2022, tim melakukan kembali program PkM yang kedua untuk mengonfirmasi hasil kegiatan yang pertama sekaligus memberikan penjelasan kondisi lapisan air tanah di sekitar area fasilitas air desa. Pengkajiannya dengan menerapkan metode elektromagnetik pasif yang terintegrasi dengan pengolahan data secara otomatis, yang disebut dengan alat PQWT. Pengukuran dilakukan di sekitar fasilitas air desa untuk mengkaji ulang ketersediaan air tanah. Keluaran dari alat tersebut memberikan informasi hingga kedalaman 150 m dan memperlihatkan bahwa lapisan batuan yang mengandung air hanya sampai 30 m saja, tidak ada indikasi keberadaan air tanah pada kedalaman sumur yang sudah ada. Tim PkM tidak merekomendasikan penggunaan dalam jangka panjang bagi warga desa karena kemungkinan besar keberadaan air tanah pada sumur tersebut bergantung pada musim. Tim juga menyarankan mencari lokasi lain di sekitar desa untuk memperoleh lapisan air tanah yang lebih dalam yang tidak terpengaruh oleh musim dan juga menentukan titik baru dalam pembuatan sumur bor.
Analisis Metode Geolistrik 2D dan VLF-EM untuk Mendeteksi Jalur Air Panas Desa Jatimulyo, Kecamatan Jati Agung, Kabupaten Lampung Selatan Putri, Uci Amelia; Paembonan, Andri Yadi; Antosia, Risky Martin; Irawati, Selvi Misna
Jurnal Geosains dan Teknologi Vol 7, No 1 (2024): April 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.7.1.2024.9-18

Abstract

Indonesia terletak pada pertemuan tiga Lempeng Tektonik yang merupakan zona rawan terjadinya letusan gunung api dan gempa tektonik sehingga banyak terdapat sumber daya panas bumi. Pada daerah penelitian Desa Jatimulyo terdapat manifestasi panas bumi berupa air panas, untuk itu perlu dilakukan survey geofisika berupa Metode Geolistrik 2D dan Metode Very Low Frequency Electromagnetic (VLF-EM) yang bertujuan untuk memodelkan litologi bawah permukaan dan mendeteksi patahan sebagai jalur keluar air panas. Metode Geolistrik 2D dilakukan dengan menginjeksi arus listrik ke bawah permukaan bumi sehingga beda potensial terukur dan didapatkan nilai resistivitas. Metode VLF-EM dapat mendeteksi arah dan posisi patahan dengan memanfaatkan frekuensi gelombang elektromagnetik yang rendah sehingga penetrasi kedalaman lebih dalam dibandingkan metode geolistrik 2D. Kedua metode dikorelasikan sehingga terdapat empat jenis litologi batuan pada daerah penelitian, nilai resistivitas 1Ωm – 22Ωm merupakan lempung tufan, nilai resistivitas 23Ωm – 80Ωm merupakan pasir tufan, nilai resistivitas 23Ωm – 310Ωm merupakan top soil dan nilai resistivitas 81Ωm – 688Ωm merupakan batuan beku. Pada hasil pemodelan terdapat patahan dengan arah baratlaut-tenggara dan timurlaut-baratdaya yang menjadi jalur keluarnya air panas kepermukaan.
IDENTIFIKASI PERSEBARAN BATUAN ANDESIT SEBAGAI BAHAN UTAMA AGREGAT MENGGUNAKAN METODE GEOLISTRIK PROFILING KONFIGURASI WENNER-ALPHA Setiawan, Dimas; Antosia, Risky Martin; Nugraha, Purwaditya
Jurnal Geosaintek Vol. 9 No. 2 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Geodiversity and Geoheritage Potential of Basalt Caves in Girimulyo Village, East Lampung, Indonesia: A Mixed-Method Assessment Approach Al Farishi, Bilal; Faranabila, Syifa; Prima, Gilbert; Rahadian, Zatalini Syadni; Natalia, Happy Christin; Santoso, Nono Agus; Antosia, Risky Martin
Global Review of Tourism and Social Sciences Vol. 1 No. 2 (2025): Global Review of Tourism and Social Sciences
Publisher : Yayasan Ghalih Pelopor Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/grtss.v1i2.351

Abstract

This study evaluates the geodiversity and geoheritage potential of basalt caves in Girimulyo Village, East Lampung, Indonesia, focusing on scientific, educational, tourism, and degradation risk values. Eight caves, including Pandan 1, Pandan 2, Kelelawar, and Kubah, were assessed through field observations, stakeholder interviews, and visual documentation. Pandan 1 Cave demonstrated the highest potential with an average score of 281.67, attributed to its unique geological features, including A’a lava, pahoehoe lava, and bread crust textures. Kelelawar Cave’s biodiversity, particularly its bat habitat, highlights its suitability for ecotourism, while Kubah Cave attracts adventure tourists with its columnar joint formations. Jagung Cave was identified as the most vulnerable to degradation, scoring 295 due to agricultural activities nearby. Conservation measures, visitor management, and sustainable tourism practices are essential to protect these geoheritage sites. Recommendations include developing visitor pathways, educational tours, and geotourism infrastructure. Limitations include reliance on visual assessments for degradation risk and limited cave access. Future research should include geotechnical analysis and explore the socio-economic impact of geotourism on local communities. The findings provide a framework for sustainable geotourism, balancing conservation, education, and tourism growth.
Analisis Variasi Spasial a- dan b-Value Sebagai Indikator Kegempaan di Wilayah Nusa Tenggara bagian Timur Rahmadani, Putri Amindar; Risky Martin Antosia; Anas Fauzi Masykuri; Putu Pradnya Andika
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1382

Abstract

Eastern Nusa Tenggara, encompassing Timor, Flores, Alor, and Kupang City, lies along the active collision zone between the Indo-Australian and Eurasian plates, making the region highly susceptible to earthquakes. This study analyzes the spatial variation of a-value and b-value based on the earthquake catalog from 1998–2023 using ZMAP v.6.0 software. The frequency–magnitude distribution (FMD) curve indicates an inverse relationship between earthquake frequency and magnitude. Spatially, relatively high b-values are observed in eastern Flores to Alor, indicating frequent seismic activity with low released energy, while the variation of a-value reflects the level of seismicity, ranging from 5.0–6.0, with b-values between 0.8–1.1. These findings provide valuable insights for disaster mitigation, infrastructure planning, and enhancing community preparedness in Eastern Nusa Tenggara, including Kupang City.
Co-Authors Aganda, Riyanto Dedinta Akbar, Hendra Hidayat Al Farishi, Bilal Anas Fauzi Masykuri Andreas Maruli Pakpahan Andri Yadi Paembonan Angga Jati Widiyatama Bilal Al Farishi Depri Dimas Setiawan Dimas Setiawan Ekawati, Gestin Mey Erlangga, Mokhammad Puput Faranabila, Syifa Farduwin, Alhada Farishi, Bilal Al Hissy Ijitiha Sari Hita Kirana Intan Adiani Putri Irawati, Selvi Misna Irawati, Selvi Misnia Natalia, Happy Christin Naufal, Rifqi Andi Nugraha, Purwaditya Octafiani, Aulia Pakpahan, Andreas Maruli Prima, Gilbert Purwaditya Nugraha Putri, Intan Andriani Putri, Uci Amelia Putu Pradnya Andika Rahadian, Zatalini Syadni Rahmadani, Putri Amindar Ramdan, Muhammad Reza Rizki Rhahmi Adni Pesma Ruhul Firdaus Santoso, Nono Agus Sari, Hissy Ijitiha Sillak Hasiany Yudha Styawan