Article Per Year (5 Year)
p-Index From 2021 - 2026
1.756
P-Index
This Author published in this journals
All Journal BERKALA FISIKA Bulletin of Scientific Contribution : Geology Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Fisika FLUX Communications in Science and Technology Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika Jurnal Pengabdian Masyarakat Indonesia Jurnal Serambi Abdimas Aceh International Journal of Science and Technology
Sehah Sehah
Jurusan Fisika, Fakultas MIPA, UNSOED, Jalan Dr. Suparno 61 Purwokerto
Agriculture, Biological Sciences & Forestry Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Public Health Social Sciences

Published : 21 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 21 Documents
Search

 1   2   3 
Coastal Hydrogeological Model in the Iron Ore Prospect Area of Widarapayung Coastal, Cilacap Regency Based on 2D-Resistivity Data Sehah, Sehah; Raharjo, Sukmaji Anom; Aziz, Abdullah Nur
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 8, No 2 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v8n2.p71-83

Abstract

The coastal hydrogeological model of iron ore prospect area in Widarapayung coastal, Cilacap Regency, has been designed and performed based on the 2D-resistivity data. The background of this research is potentiality of iron sand in this area and its prospect to be mined. Mining activities in large-scale may lead into surface decreasing, triggering damage to the aquifer, abrasion, and saltwater intrusion in the coastal area. The acquisition of 2D-resistivity data has been performed on five trajectories including of WP-01 up to WP-05. Based on the modeling results, it can be concluded that the sub-surface rocks resistivity profile consists of WP-01 with the values of 1.93-114.00 Ωm; WP-02 with the values of 3.67-121.00 Ωm; WP-03 with the values of 3.86-78.40 Ωm; WP-04 with the values of 1.79-100.00 Ωm; and WP-05 with the values of 2.61-86.20 Ωm. After interpretation, it is found that the hydrogeological profile of sub-surface rocks consists of sand inserted with gravels (topsoil); sand containing iron ore granules inserted with silt (topsoil and shallow aquifer); clayey sand (semi-aquifer layer); sandy clay (semi-impermeable layer); and sand (deep aquifer which is intruded by salt water). Based on the analysis, the sand containing iron ore is part of the shallow aquifer, so the mining activities of iron sand is potential to damage and reduce aquifer function in storing and flowing the groundwater in the research area.
Pemodelan struktur geologi bawah permukaan gunung api Ciremai berdasarkan data anomali gravitasi satelit Hasby, Esa Pallewi; Sehah, Sehah; Sugito, Sugito
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 6 No 2 (2023): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2023.6.2.11071

Abstract

Modeling of the subsurface geological structure of Ciremai Volcano has been carried out to determine the shape of the subsurface structure and volcanic magma chamber as initial mitigation. The data used in this research is satellite gravity field anomalies data obtained from the website http://topex.ucsd.edu/cgi-bin/get.cgi with positions of -6.6949° - 7.0949° S and 108.2083 ° - 108.6083° E which have been corrected to free air correction. The data processing carried out includes Bouguer and terrain corrections to obtain a Complete Bouguer Anomaly value, ranging from -117.7 – 67.5 mGal. Next, reduction to a horizontal surface using the Taylor Series Approximation and separation of regional – residual anomalies using the Polynomial method are carried out to obtain residual anomalies data ​​with a range of -116.2 – 27.93 mGal. The residual anomaly contour map shows low anomalous values ​​at the position of 108.4017° S and -6.898° E which is estimated to be the magma chamber of Ciremai Volcano which is still active. Meanwhile, the modeling results show that the position of the Ciremai Volcano magma chamber is located at 108.3965° S and -6.8962° E. This position is not directly below the volcanic crater, but 511.37 m to the east of the volcanic crater with a relatively large volume with a depth of around 2 – 8 km. The modeling results show that the subsurface geological structure of Ciremai Volcano is composed of rocks in the liquid phase (1.50-1.88 g/cm3) which are estimated to be magma chambers, sedimentary rocks including calcareous sandstone, tuffaceous sandstone, conglomerate and breccia (1, 91 – 2.65 g/cm3), as well as andesite-basaltic lava rock (2.7-3.0 g/cm3)
Pemodelan inversi tiga dimensi struktur bawah permukaan kawasan panasbumi Dieng berdasarkan data anomali gravitasi citra satelit Sehah, Sehah; Utami, Aviyatna Fikri; Sunardi, Sunardi
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 7 No 1 (2024): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2024.7.1.11803

Abstract

Data gravitasi citra satelit GGMplus dapat digunakan untuk mengetahui struktur bawah permukaan dan reservoir panasbumi, terutama untuk daerah yang sulit dijangkau seperti Dataran Tinggi Dieng. Pemodelan pada penelitian ini dilakukan secara 3D berdasarkan data anomali gravitasi residual. Tahapan penelitian yang telah dilakukan meliputi pengaksesan data, koreksi bougeur, koreksi terrain, reduksi data ke bidang datar, pemisahan data anomali regional dan residual, pemodelan inversi, dan interpretasi. Data anomali gravitasi yang telah diakses adalah data GGMplus dengan batas koordinat geografis 109,8° – 110,3° BT dan 7,12° - 7,28° LS. Setelah pengaksesan data, selanjutnya koreksi bougeur dan terrain diterapkan, sehingga diperoleh data Anomali Bouguer Lengkap (ABL) dengan nilai berkisar -56,6 – 65,7 mGal. Data ABL diproses sesuai tahapan penelitian hingga diperoleh data anomali residual yang berkisar -73.59 – 47.60 mGal. Data anomali ini terdistribusi pada ketinggian rata-rata topografi daerah penelitian, yaitu 1392.35 m. Pemodelan inversi 3D terhadap data anomali residual dilakukan sehingga diperoleh model anomali bawah permukaan dengan densitas berkisar 1.00– 4.60 g/cm3 yang diinterpretasi sebagai struktur geologi bawah permukaaan Dataran Tinggi Dieng. Hasil interpretasi menunjukan bahwa reservoir panasbumi terletak pada batuan lava andesit dengan densitas total berkisar 2.80 – 3.70 g/cm3
Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data Sehah, Sehah; Prabowo, Urip Nurwijayanto; Raharjo, Sukmaji Anom; Ikhwana, Aina Zahra
Communications in Science and Technology Vol 7 No 2 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.2.2022.1001

Abstract

Slamet Volcano (3,432 m) is the highest volcano in Central Java, Indonesia, with a weak explosive type of eruption compared to other active volcanoes. Designing the magma chamber model may help reveal the characteristics of Slamet Volcano. The modelling uses the gravimetric satellite data from GGMplus, which is best in spatial resolution compared to other satellite data, i.e. 220 m. Data processing begins with Bouguer correction and terrain correction and has resulted in complete Bouguer anomalies data, with values ranging from 11.068 – 117.451 mGal. Further, residual Bouguer anomalies data were obtained after data reduction to the horizontal surface and removal of regional anomalies data, to obtain values ranging from -67.569 – 38.808 mGal. The residual anomaly contour map shows the lowest anomalous value is under the volcanic cone at positions of 109.21967° E and 7.24281° S which is estimated to be the location of the magma chamber of Slamet Volcano. However, the inversion modeling resulting from the residual Bouguer anomalies data shows that the magma chamber of Slamet Volcano can be observed clearly at positions of 109.22053° E and 7.24719° S. The location of the magma chamber is not perfectly vertical under the volcanic cone but has a slight slope. The obtained model of the magma chamber has a relatively small volume and shallow depth, i.e. about 1 – 4 km. The obtained physical parameters of the magma chamber impact the characteristics of the eruption of Slamet Volcano which tend to be weak explosive.
Implementasi Teknologi Elektrolisis dan Pemanen Air Hujan Dalam Mendukung Penyediaan Air Minum dan Konservasi Sumber Daya Air di Sekolah Generasi Mulia, Kabupaten Banyumas Hardanto, Afik; Sehah, Sehah; Afwa, Ulil
Jurnal Pengabdian Masyarakat Indonesia Vol 4 No 6 (2024): JPMI - Desember 2024
Publisher : CV Infinite Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jpmi.3084

Abstract

Wali murid Sekolah Generasi Mulia yang menjadi mitra kegiatan kami, berlokasi di Kabupaten Banyumas, Propinsi Jawa Tengah. Pada saat ini, mitra memenuhi kebutuhan air minum melalui pembelian air isi ulang, sedangkan air hujan memiliki potensi sebagai sumber air minum meskipun pH nya rendah (berkisar 5-6). Selain itu, mitra belum memahami kaitan antara air hujan dan konservasi sumber daya air. Tujuan program pengabdian adalah meningkatkan pemahaman terkait pemanfaatan air hujan sebagai sumber air baku minum dan konservasi sumber daya air melalui teknologi elektrolisis dan Pemanen Air Hujan (PAH). Metode dilakukan dengan diseminasi teknologi dan pelatihan. Berdasarkan hasil diseminasi teknologi, metode elektrolisis mampu menaikkan pH air hujan dari 6,4 menjadi 9 dalam waktu sekitar 21 jam. Sedangkan, teknologi PAH mampu menjaga pengisian air tanah melalui drainase vertikal. Selain itu, Peningkatan pemahaman mitra terhadap teknologi mengalami peningkatan signifikan (32% menjadi 95%). Pemahaman mitra terhadap teknologi yang dikenalkan merupakan faktor penting dalam mendukung optimalisasi pemanfaatan air hujan dan keberhasilan konservasi sumber daya air di daerah kawasan pemukiman.
Identifikasi struktur geologi pada zona sesar di daerah Kalibening kabupaten Banjarnegara menggunakan metode gravitasi Maghfiroh, Fatkhiyatul; Sehah, Sehah; Sugito, Sugito
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 7 No 2 (2024): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2024.7.2.11853

Abstract

Penelitian menggunakan metode gravitasi telah dilakukan di daerah Kalibening Kabupaten Banjarnegara. Penelitian ini bertujuan untuk mengidentifikasi keberadaan dan jenis sesar serta struktur geologi bawah permukaan daerah penelitian berdasarkan data anomali gravitasi. Penelitian menggunakan analisis First Horizontal Derivative (FHD) dan Second Vertical Derivative (SVD) untuk mengetahui keberadaan dan jenis sesar. Data yang digunakan merupakan data sekunder yang diperoleh melalui Peta Anomali Bouguer yang diterbitkan oleh Pusat Sumberdaya Geologi Bandung. Jumlah data yang digunakan pada penelitian sebanyak 540 data dengan luas daerah 26 km x 19 km. Tahapan penelitian yang dilakukan meliputi reduksi data ke bidang datar, pemisahan data anomali regional dan residual, serta analisis FHD dan SVD untuk mengetahui keberadaan sesar dan jenisnya. Hasil penelitian mengindikasikan bahwa di daerah Kalibening terdapat sebuah sesar dengan kategori sesar rotasi yang memiliki orientasi barat laut-tenggara dengan kemiringan 10°. Sedangkan hasil pemodelan dua dimensi memperlihatkan bahwa daerah Kalibening tersusun atas tujuh formasi batuan yaitu Formasi Gunungapi Jambangan (Qj) dengan nilai densitas 2,59 - 2,69 g/cm3, Formasi Ligung (QTlb) dengan nilai densitas 2,60 – 2,75 g/cm3, Formasi Halang (Tmph) dengan nilai densitas 2,66 – 2,79 g/cm3, Formasi Rambatan (Tmr) dengan nilai densitas 2,70 – 2,85 g/cm3, Anggota Sigugur Formasi Rambatan (Tmrs) dengan nilai densitas 2,67 – 2,85 g/cm3, Formasi Totogan (Tomt) dengan nilai densitas 2,82 – 2,88 g/cm3, dan batuan intrusi (Tm) dengan nilai denstias 2,83 – 2,90 g/cm3.
Comparison Of Facies Estimation Using Support Vector Machine (SVM) And K-Nearest Neighbor (KNN) Algorithm Based on Well Log Data Prabowo*, Urip Nurwijayanto; Ferdiyan, Akmal; Raharjo, Sukmaji Anom; Sehah, Sehah; Candra, Arya Dwi
Aceh International Journal of Science and Technology Vol 12, No 2 (2023): August 2023
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.12.2.28428

Abstract

Facies classification is the process of identifying rock lithology based on indirect measurements such as well log measurements. Usually, the facies are classified manually by experienced geologists, so it takes a long time and is less efficient. In this paper, two machine learning (Support vector machine and K-Nearest Neighbor) were adopted to increase the effectiveness and shorten the time process of facies classification in Z Field, Indonesia. The machine learning algorithm was carried out in 4 steps, i.e. data selection, training phase, verification, and validation stage. The machine learning input data are density log, gamma ray log, resistivity log, SP log; and the output facies target are Sandstone, Siltstone, Claystone, and Limestone. The data is divided into train data for the training process and test data to validate the machine learning output. In Support vector machine results, the training accuracy is 70.1% and the testing accuracy is 47.4%, while in KNearest Neighbor results, the training accuracy is 70.1% and the testing accuracy is 63.3%. This result showed K-Nearest Neighbor has better accuracy than the support vector machine in facies classification in the Z field.
Pelatihan Teknis Pembuatan Instalasi Komposter Sederhana untuk Pengelolaan Sampah Rumah Tangga di Wilayah RW 05 Kelurahan Sumampir Kota Purwokerto Sehah, Sehah; Kartika, Dwi; Aziz, Abdullah Nur
Jurnal Serambi Abdimas Vol 5 No 2 (2024): Jurnal Serambi Abdimas
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.sa.2024.5.2.13025

Abstract

Volume sampah rumah tangga yang besar merupakan suatu masalah, sekaligus peluang untuk menyelesaikan permasalahan sampah dari sumbernya. Salah satu upaya yang telah dilakukan adalah pelatihan teknis pembuatan komposter sederhana. Komposter adalah alat yang digunakan untuk mengubah sampah organik menjadi kompos melalui proses dekomposisi. Mitra dan khalayak sasaran yang dilibatkan dalam kegiatan PKM Penerapan IPTEKS adalah pengurus dan warga RW 05 Kelurahan Sumampir Kecamatan Purwokerto Utara Kabupaten Banyumas. Kegiatan PKM ini bertujuan memberikan pelatihan teknis pengolahan sampah rumah tangga menggunakan instalasi komposter sederhana serta teknis merancang dan membuat alat komposter sederhana dari bahan bekas. Manfaat yang diperoleh adalah masalah sampah rumah tangga dapat teratasi dan dihasilkan pupuk organik yang berkualitas. Respon khalayak sasaran terhadap kegiatan pelatihan teknis telah diobservasi melalui kuisioner. Berdasarkan respon, diperoleh nilai capaian keberhasilan rata-rata sebesar 81%. Capaian tertinggi sebesar 88% untuk dukungan terhadap kegiatan pelatihan teknis sebagai wahana untuk penyebarluasan teknologi tepat guna bagi masyarakat. Sedangkan capaian terendah sebesar 71% untuk keyakinan peserta bahwa implementasi hasil pelatihan teknis akan memperoleh hasil kompos yang optimal. Salah satu faktor pendukung kegiatan ini adalah desain komposter cukup sederhana yang terbuat dari drum plastik dan tidak memerlukan space yang luas, sehingga mudah ditempatkan di bagian outdoor maupun indoor rumah termasuk dapur. Selain itu dukungan mitra dan khalayak sasaran sangat besar terhadap pelatihan teknis pembuatan instalasi komposter sederhana skala rumah tangga. Sedangkan salah satu faktor penghambat adalah peserta pelatihan teknis masih terbatas dan belum menjangkau seluruh masyarakat
Identifikasi Sesar Menggunakan Transformasi Pseudogravitasi Data Anomali Magnetik di Desa Pekuncen Kecamatan Jatilawang Kabupaten Banyumas Sehah, Sehah; Raharjo, Sukmaji Anom; Sa'adah, Fajar Nur
Bulletin of Scientific Contribution Vol 21, No 2 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i2.47228

Abstract

Geophysical survey with magnetic method has been carried out in Pekuncen Village, Jatilawang District, Banyumas Regency. Magnetic data acquisition was carried out on 131 points using a set of Proton Precession Magnetometer (PPM) equipment. Data processing includes daily and IGRF corrections, reduction to a horizontal surface, and upward continuation. The application of pseudo-gravity transformation was carried out on magnetic anomalies data to clarify the sources of the magnetic anomalous which are the study target. Anomaly modeling was carried out along the AA' and BB' trajectories to identify the possibility of subsurface faults. Determination of the position of these trajectories is based on a pseudogravity anomaly contour map, especially to help determine the presence of faults. Based on the modeling results on the AA' trajectory, fault is found in sedimentary rock and basaltic rock; whereas in BB' trajectory, fault is found in basaltic rocks. Based on the modeling results, the maximum depth of the two faults is 500 m.
Interpretasi Sebaran Batuan Andesit di Desa Karangcegak Kecamatan Kutasari Kabupaten Purbalingga Berdasarkan Data Resistivitas dengan Konfigurasi Wenner-Schlumberger Sehah, Sehah
Bulletin of Scientific Contribution Vol 20, No 1 (2022): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v20i1.39043

Abstract

Karangcegak Village, Kutasari District, Purbalingga Regency has high andesite rock potential. Andesite rock has been mined traditionally by the local community, but its utilization is still not optimal. This study aims to determine the distribution of andesite rocks based on the resistivity data of the Wenner-Schlumberger configuration. Resistivity data acquisition was done on four trajectories with a length of 195 m. The GL-01 trajectory is located at a geographical position of 07°19'23.3” S; 109°17'19.6” E, the GL-02 trajectory is located at position of 07°19'23.9” S; 109°17'21.1” E, the GL-03 trajectory is located at position of 07°19'24.3” S; 109°17'21.8” E, and the GL-04 trajectory is located at position of 07°19'25.1” S; 109°17'22.8” E. Calculation of field data (i.e. voltage and current) were carried out to obtain apparent resistivity data. The calculated data are stored in the notepad format, and are used as input data for resistivity data modeling. The resistivity data modeling were carried out in 2D and 3D using RES2DINV 3.54 and VOXLER 4.0. The structure of the subsurface rock layers obtained on the four trajectories consists of three types of rock, i.e. the lava breccia with a resistivity value of less than 1,510 m, weathered andesite rock with resistivity values ranging from 1.511 – 4,000 m, and andesite rock with resistivity values are more than 4,000 m. Andesite rocks are found in all trajectories with a depth of 0 – 36 m. Based on the results of the analysis of the 2D resistivity cross section in each trajectory and the 3D pseudo-resistivity, the potential of andesite rock in the study area is estimated to be very large. The study results also show that the direction of the distribution of andesite rocks is in accordance with the direction of the lava flow of Slamet Volcano, i.e. from southwest to southeast.
Co-Authors Abdullah Nur Aziz Abdullah Nur Aziz Afwa, Ulil Ardhana Reswara P.A. Arya Dwi Candra Chandra Adi Prasetyo, Chandra Adi Dwi Kartika Ferdiyan, Akmal Hartono Hartono Hasby, Esa Pallewi Ikhwana, Aina Zahra J. Aminuddin Maghfiroh, Fatkhiyatul Mutaabidah, Insyahita Akmalia Prabowo*, Urip Nurwijayanto Priyadi, Pujo Sa'adah, Fajar Nur Sugito - Sukmaji Anom Raharjo Sunardi Sunardi Urip Nurwijayanto Prabowo, Urip Nurwijayanto Utami, Aviyatna Fikri Zaroh Irayani