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Pemodelan inversi gayaberat dengan panduan Euler deconvolution untuk struktur bawah permukaan di Lapangan Panas Bumi ”B24” Brandan Tito Ramadhan; Agus Setyawan; Dwi P. Sasongko; Imam Baru Raharjo; R. M. Tofan Sastranegara
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Gravity data inversion requires a good initial mesh model to generate a good subsurface model. Ambiguities in gravity data can be reduced by Euler deconvolution’s point cluster result that show its position and depth. These point cluster can give an additional information to shape the initial mesh model for inversion. The purpose of the study was to determine the influence of Euler deconvolution to the inversion. Inversion was done by the steepest descent algorithm. Euler deconvolution method and inversion algorithm were tested on synthetic models and showed good results that Euler deconvolution able to construct actual density distribution. These methods were applied to the gravity data on the "B24” geothermal field. Residual anomaly map has a value of -12 to 24 mGal. The geothermal field is estimated that it has a major fault which mainly striking in northwest-southeast direction. These estimates are supported by the results of Euler deconvolution which indicate the presence of fault and graben structure. Euler deconvolution and inversion method were applied perpendicularly to the main structure at the southwest-northeast direction. The results of this study are the Euler deconvolution method is able to provide information for a mesh geometry for inversion. From the inversion result, “B24” geothermal field is estimated has a high-low-high density distribution dominated by andesite and tuff. To improve the results of the research, it needs a measurement point addition, additional modeling area, geological and geochemical data to strengthen the interpretation.Keywords: density, Euler deconvolution, gravity inversion, geothermal
INTERPRETASI STRUKTUR BAWAH PERMUKAAN DAERAH MANIFESTASI PANASBUMI GEDONG SONGO GUNUNG UNGARAN MENGGUNAKAN METODE MAGNETIK Harri Yudianto; Agus Setyawan
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Interpretation of subsurface structure has done in Gedong Songo geothermal manifestation of Ungaran volcano using magnetic method. Interpretation of subsurface structure showed in two dimensions. The quantitative interpretation result show that, Gedong Songo is compose of 4 main layers. The first layer is sedimentary which consists of breccia, sandstone, pyroclastic deposits, alluvium, and top soil, it have a susceptibility value about 7.0x10-5 cgs emu, the second layer is an alteration of andesite lava, it has a susceptibility value about -1.0x10-2 cgs emu. Third layer is composed of hornblende-augite andesite, it has a susceptibility value about 1.34x10‑2 cgs emu, and the fourth layer is composed of andesite rock, it has susceptibility value about 1.35x10-2 cgs emu. Keywords : Magnetic, susceptibility, geothermal, Gedong Songo
PEMODELAN BAWAH PERMUKAAN DAERAH PANASBUMI KALIULO BERDASARKAN DATA RESISTIVITAS KONFIGURASI SCHLUMBERGER DENGAN ALGORITMA JARINGAN SYARAF TIRUAN-BACKPROPAGATION Frysca Putti Muviana; Agus Setyawan; Rahmat Gernowo
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research used secondary data configuration Schlumberger geoelectric method in the area of geothermal manifestations Kaliulo Mount Ungaran to implement the use of artificial neural network algorithm in geophysical this case to obtain the actual value of the thickness and resistivity. In this artificial neural networks do two processes, namely the training and testing, the training using synthetic data and on testing using field data Then in training the neural network produced the best architectural which is used train resilient propagation (train rp) with three hidden layers with each neuron in the hidden layer consist of 300 neuron, this architecture will be used in testing. The output of the test data is value of the thickness and true resistivity which can be modeled. Result modeling of data processing from ANN is almost the same with IPI2WIN, MSE value obtained is equal to 0.10519 and 0.088304 respectively on the thickness and resistivity actually. The result of 3D model shows the lower part of the earth's subsurface its rock consists as following: topsoil, clay, volcanic breccias, tuff and limestone. 
ATENUASI MULTIPLE SEISMIK REFLEKSI LAUT MENGGUNAKAN METODE FILTERING RADON PADA PERAIRAN X Murtiningtias Diah Ayu Martha Dewi; Oki Hedriana; Agus Setyawan
Youngster Physics Journal Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Multiple caused by waves that trapped in a layer of sea water or rock layers. The effect information propagation time longer effect as if there is a new layer, thus looping wave reflection. The existence of multiple noise is disruptive and even damaging that complicates intrepetasi in interpreting seismik that have focused so that multiple seismik cross sections obtained free of multiple. Methods in multiple energi weaken, one of them by using the filtering radon method which, in principle, filtering radon, radon transform of the data pre-stack time-offset domain (t-x) in the domain of p-tau (τ-p). In τ-p domain and the expected multiple primary signal can be distinguished by the speed difference moveoutnya. This study aims to evaluate the response of radon filtering is applied to the conventional method for multiple mengatenuasi. The results obtained from the radon showed multiple filtering methods reduced from previous conventional methods which showed multiple. It shows good effect radon filtering methods to weaken multiple.Keywords: multiple, Radon filtering, conventional method.
Identifikasi struktur sesar daerah manifestasi panas bumi “X” di Kabupaten Manggarai Nusa Tenggara Timur berdasarkan analisis Horizontal Gradient Anik Fitrochaton Chasanah; Agus Setyawan; Dadan Dani Wardhana
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Area “X” located in Manggarai of East Nusa Tenggara is volcanic area in Indonesia which has the potential for geothermal to be indicated by the appearance of a geothermal manifestation of hot springs and fumarole or sulfatar. Processing data by analysis gradient horizontal has been done to determine the structure of fault. From the map complete Bouguer anomali (ABL) shows anomalies in the middle of the study area which is a crater form of Mount Poco Ranakah, Poco Manggung, Poco Mandasawu and Poco Kasteno. In the southwest of the study area there is a low anomaly associated with alteration zone of rocks and hot springs. The high anomaly to the North of the study area lies in the crumpled hills, so that the area is dominated by high anomaly values. Gradient analysis were performed determine the limits of lithogy and the structure of fault associated with the appearance of hot springs and fumarol or sulfate in the study area. Geothermal manifestastios MAP 6, MAP 7, MAP 8, F/S 1 and F/S 2 controlled by strike slip fault of horizontal gradient. Geothermal manifestations of MAP 1, MAP 4 and MAP 11 are located on geological fault trending Northeast-Southwest  and Northwest-Southeast. Keywords: gravity data, gradient analysis
ANALISA PERSEBARAN LITOLOGI SANDSTONE PADA FORMASI TALANG AKAR MENGGUNAKAN INVERSI EXTENDED ELASTIC IMPEDANCE (EEI) DI LAPANGAN CILAMAYA, CEKUNGAN JAWA BARAT UTARA Ophi Thio Rendy; Agus Setyawan; Muhammad Mualimin
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Extended Elastic Impedance (EEI) inversion method has been used to analyze sandstone lithology distribution of Talang Akar Formation in Cilamaya Field, North West Java Basin. The target zone was Z2230 layer which located in Talang Akar Formation with litologies of sandstone and shale. Sensitivity analysis showed that gamma-ray and density are sensitive to discriminate the type of lithologies in Z2230 target layer. EEI(58) could simulate gamma-ray and EEI(12) could simulate density with respectively 0,397 and 0,613 correlation values. EEI(12) inversion result showed sandstone lithology distribution in Z2230 layer with 8800 to 9800 . Sandstone lithology distribution concentrated in northwest–southeast of study area. There was hydrocarbon prospect area in north of well OTR-10.Keywords : Extended Elastic Impedance (EEI), gamma-ray, density, sandstone 
Peringatan Dini Tanah Longsor Berdasarkan Kelembaban Tanah Secara Jarak Jauh Menggunakan Sensor FC-28 dan Node MCU Agus Setyawan; Jatmiko Endro Suseno; Ratna Dewi Winesthi; Sela Ade Otaviana
Jurnal Ilmu Lingkungan Vol 18, No 2 (2020): Agustus 2020
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (335.072 KB) | DOI: 10.14710/jil.18.2.242-246

Abstract

Tanah longsor merupakan salah satu bencana yang sering terjadi di Indonesia, terutama di daerah pegunungan, lembah dan perbukitan dengan kondisi lereng yang tidak stabil. Saat musim hujan tiba maka kadar air yang berlebihan mengakibatkan tanah longsor. Bencana tanah longsor dapat menyebabkan banyak kerugian antara lain: kematian, gangguan infrastruktur jalan dan rusaknya lahan pertanian. Hal tersebut dipengaruhi oleh 2 faktor utama yaitu kemiringan lereng dan kelembaban. Penelitian ini bertujuan untuk meminimalkan korban jiwa dengan merancang alat pendeteksi peringatan dini bencana tanah longsor menggunakan sensor Soil Moisture FC-28 dan NodeMcu longsor yang terhubung ke android melalui telegram, sms dan buzzer. Sensor soil moisture FC-28 dipakai untuk mendeteksi parameter kelembaban tanah. Pengujian potensi terjadinya tanah longsor didesain dalam 5 variasi kemiringan untuk mendapatkan nilai kembebaban yang bervariasi. Alat dirancang dengan 2 kondisi yaitu status siaga dan bahaya. Hasil pengujian menunjukkan bahwa kondisi siaga terjadi pada kelembaban antara 27% - 54% dengan kemiringan lereng antara 25o -35o dan kondisi bahaya terjadi saat kelembaban lebih dari 54%. Peringatan dini akan terkirim melalui pesan singkat ada aplikasi telegram messenger saat kondisi status siaga, sedangkan alarm akan berbunyi pada saat status bahaya. Alat ini akan sangat bermanfaat bagi warga yang tinggal didaerah rawan bencana longsor, karena dengan adanya tanda peringatan dini warga diharapkan masih mempunyai waktu untuk menyelamatkan diri sehingga korban jiwa dapat diminimalkan.
Identification of Landslide with Resistivity Method at Candi Industrial Area, Ngaliyan, Semarang Nuriyana Muthia Sani; Agus Setyawan; Rahmat Gernowo
Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i2.10674

Abstract

Landslides can be occurred in almost every natural slope or artificial slope slowly or suddenly with or without any prior signs. The main reason for slope collapse is the increase in shear stress in the landslide, the decrease in shear strength, or both. Landslide problems can result in loss of life and property, damage to the environment, infrastructure, public facilities, and disrupt livelihood generally. Landslides can be detected by exploration of the subsurface. The geoelectrical method is one of the geophysical methods to know the change of resistance of a type of rock layer below ground level. The research aims to interpret the lithology of the subsurface in the Candi Industrial Area, Ngaliyan, Semarang using Schlumberger configuration. The results of measurements are voltage and electric current to calculate the apparent resistivity value processed by IP2Win software to determine the lithology and the slip surface area. The results present that lithology in the research area consists of sand clay, clay, and sandstone. The results showed that the locations of landslide-prone areas lie at the contact between sand clay and clay with that area at a depth of between 19.95 – 31.62 m there is one difference in the resistivity value which can be assumed to be a slip surface.The result of the research can be used to make policy rules of landslide mitigation.
The Mass Distribution of Soputan Volcano Based on Gravity Data Dave Emmanuel Haning; Agus Setyawan; Rina Dwi Indriana
Journal of Physics and Its Applications Vol 4, No 2 (2022): May 2022
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i2.13230

Abstract

The gravity method is a passive method based on the density measurement among sediment. This method is usually applied to identify the condition of the earth’s subsurface. Soputan Volcano is located in District Minahasa Tenggara. Soputan Volcano is included in type A Volcano or stratovolcano and it stands at 1783.7 MSL. This research aims to identify the distribution of subsurface mass (sediment density) of Soputan. The data used was Data from satellite GGmPlus and elevation data of ERTM which was corrected to ellipsoid reference. 3D inversion modeling applied Grablox software. The complete value of the Bouguer anomaly obtained was 110 – 162 mGal. The density result obtained from the inversion model was 2.3 g/cm3 to 2.95 g/cm3. The sediment that could be identified was andesite sediment and basalt sediment. Based on that result, the layer arranging Soputan Volcano consists of many variations of mass in each depth grouped into andesite, breccia, basalt, andesite-basaltic, lava, breccia, and tuff.
Pemodelan Anomali Gaya Berat Akibat Curah Hujan dan Dinamika Air Tanah di Daerah Semarang (Halaman 42 s.d. 44) Yatti Pratyas Katrinavia; Agus Setyawan; Supriyadi -
Jurnal Fisika Indonesia Vol 19, No 56 (2015)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (199.607 KB) | DOI: 10.22146/jfi.24358

Abstract

Pemodelan ke depan (forward modelling) anomali gaya berat  telah dilakukan dengan menggunakan software Grav2DC untuk mengetahui respon anomali gaya berat akibat curah hujan dan dinamika air tanah di kota Semarang. Pemodelan dilakukan dengan pendekatan model perlapisan tanah dengan parameter ketebalan dan densitas berdasarkan sayatan peta geologi. Anomali gaya berat didapatkan dari selisih g pada periode pertama dan periode kedua. Anomali gaya berat akibat curah hujan merupakan selisih besarnya presipitasi pada periode pertama dan kedua. Berdasarkan hasil pemodelan kedepan yang dibuat dapat disimpulkan bahwa akibat dinamika air tanah dapat menghasilkan perubahan gayaberat (Δg) yang bernilai positif (+) jika terdapat kenaikan air tanah dan respon anomali gaya berat bernilai negatif (-) jika terjadi penurunan air tanah. Hasil anomali gaya berat akibat perbedaan curah hujan tiap tahun menyebabkan penurunan air tanah (Δh) sebesar 0,93 sampai 1,4 mm/tahun dengan anomali gaya berat sebesar –1,17 sampai  –1,76  mGal.
Co-Authors A. Suhandi A.A. Ketut Agung Cahyawan W Achmad Samsudin Achmad Supriyadi, Achmad Adi Nugroho Agnis Triahadin Agnis Triahadini, Agnis Agung Prasetyo Agus Subagio Agus Susilo Agustina, Cynthia Ahwy Oktradiksa Akbar, Shofya Alfina, Ria Aliyatarrafiah Aliyatarrafiah Althafunnisa, Namyra Aisha Aman Damai, Abdullah Anik Fitrochaton Chasanah Ansori, Teguh Arif, Mas Achmad Syamsul Arlanda, Revilarita Asri Nurdiana, Asri Astuti, Andriani Mei Azis, Latif Saiful Azizah Azizah Azizi, Sandi Bambang Mujihardi Baroek, Marino Christiano Berta Putri Boko Nurdiyanto Brandan Tito Ramadhan Choirul Wahid, Imam Mustofa D Febrianty Dadan Dani Wardhana Damai, A Aman Dave Emmanuel Haning Dewi Mariyaningsih Dhana Hastuti Dimas Sidiq Baskoro Dita Aprilina Djalal Er Riyanto Dwi Purwantoro Sasongko Dwi Puspitasari Dwiki, Elba Dwiyanto JS Dzuelqarnain, Muhammad Essa eko efendi Elisdiana, Yeni Endriasmoro M Siagaan Esti Harpeni F M Arif Faizal Ahmad Fajar Waskito Fajrin, Fajrin fidhoh, kha Fidyandini, Hilma Putri Firdausi, Hilma Nahwa Fithria I D, Ni'matul Fitra Ramdhani Fitra Ramdhani Florentina Yuni Arini, Florentina Yuni Frysca Putti Muviana Fuad Tarmidzi Galang Virgiawan Ganap Y. Febrika Ganap Yuliana Febrika Ghufron Abdullah Gunawan, Riyan Habib, Farid Alif Harri Yudianto Hauzan, Noor Azmi Fachri Hauzan, Noor Azmi Fachri Hay's, Riyan Naufal Herbianto, Sheren Aurellya Hidayat, Muhammad Adil Hidayati, Ina Hilmi, Haidar Hirafiany Daruartati I Gusti Ngurah Antaryama I Nyoman Sujana Ibnu Rasid Ida Hayu Dwimawanti Ilham Nurdien Imam B. Raharjo Imam Baru Raharjo Imam Baru Raharjo Indah Asmoro Wulan Indra Gumay Febryano Irawan, Ady Isa Akhlis Isnain Gunadi Istikomah Istikomah Istiqomah Ari Kusuma Ita purnamasari, Ita Itasari, Andri Astuti Jatmiko Endro Suseno Jatmiko Endro Suseno Juliasih, Ni Luh Gede Ratna Kanthi Pamungkas Sari Kasanah, Nur Khafidhoh Khafidhoh, Khafidhoh Khairunissa, Hatifa Khasana, Devi Ardiyati Kholidin, Edy Barkat Kusno Adi Sambowo Kusumaningrum, Rahma Puspita Lendriadi A. Lestari, Kiki Indah Lestari, Sepnina Like Limin Santoso Linirin Widyastuti, Endang Listia, Octa Lutfiani, Ulfah M Wildan Firdaus Maharani, Ni Putu Diva Mahestri, Laras Mahmud Yusuf Malau, Victor Pandpotan Maya Riantini, Maya Maya Sekar Wangi Moch. Abdul Mukid Mohammed I. D. Matar, Mohammed Mualimin Mualimin Mualimin Mualimin Muchammad A Rofik Muchlis, Ibnu Mufita, Halimah Muhammad Irham Nurwidiyanto Muhammad Mualimin Muhammad Nur Muhammad Nur Handoyo Munti Sarida Murtiningtias Diah Ayu Martha Dewi Mustafid Mustafid Mutiatussholikah, Dita Muyasaroh, Evi Nafiisah, Nafiisah Naufal, Adnan Faris Ningsih, Setia Nisa Az Zuhdy, Afifah Nona Dili Maricci Noor Alis Setiyadi Noor, Huriyatul Fitriyah Noviana Fransiska Nuning Nurcahyani Nur Rachmaningtias Nurcahyo, Mugi Nurhadiyastuti, Ameilia Nuriyana Muthia Sani Nursamsiah Nursamsiah Nurul Khasanah, Nurul Nur`Ani Okta Trilia Octaviani Sarmauli Oki Hedriana Oky Irawan Sugiri Ophi Thio Rendy Parabi, Achmad Reza Parbuntian Sinaga Pitojo Budiono Prabowo, Muhammad Nur Priyo, Priyo Putra, Hisbicus Dwi Surya Qadar Hasani R. M. Tofan Sastranegara Rahayu, Wiji Rahaz, Muhammad Faiz Thoyib Rahmasari, Ikrima Rahmat Gernowo Ramadhan, Irvan Rara Diantari Ratih Rundri Utami Ratna Dewi Winesthi Redemtus Heru Tjahjana Rina Dwi Indriana Rina Hesti Utami Ririn Sulpiani Sakti, Doni Bilga Komara Sari, Azzahra Indah Satriyo Adhy Sela Ade Otaviana Setiawan, Aqshal Dwi Siti Fathonah Siti Hudaidah Siti Rohimah Sitompul, Hotlan Albert Adventus Subandoro, Agus Sudarno Sudarno Sugeng Widada Sugiharto, Sh Sumino, Sumino Supono Supono Supriyadi - Supriyadi - Susanti, Oktora Susanti, Susanto, Gregorius Nugroho Sutrisno, Ade TATI NURHAYATI Teguh Satya Bhakti Teguh Suroso Thessa Putri Aulia Tiara Qonita, Azhra Tiara Qonita Titik Haryati Tugiyono Tugiyono Udi Harmoko Wahyono, Catur Wahyu Eko Sulistiono Wardiyanto - Widiarso Dian Agus Widiastuti, Endang Linirin Winaldi, Iman Wisnu Agung Permadi Wiyatanto, M Toto Yasluh, Muhammad Sholukha Yatti Pratyas Katrinavia Yatti Pratyas Katrinavia Yayan Yuliananto Yayan Yuliananto Yeni Indriyani Yoga Aribowo Yudha T Adiputra Yudha Trinoegraha Adiputra Yundari, Yundari Yuniarti, Siti Yusup, Maulid Wahid Zainal Abidin Zaini, Syakila Zulfikar Zafeskan Ronapati