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All Journal Indonesian Journal of Geography BERKALA FISIKA Bulletin of Scientific Contribution : Geology Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Fisika FLUX INDONESIAN JOURNAL OF APPLIED PHYSICS Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) Communications in Science and Technology Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika 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 Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Hydrostratigraphic Model Analysis Based on Rock Resistivity Data in the Purbalingga Regency Area, Central Java, Indonesia Sehah, Sehah; Aziz, Abdullah Nur; Pulo Boli, Lusia Silfia; Addailamy, Faizah Ayu; Anas, Almas Atilya Aini; Mubarak, Fuad
Indonesian Journal of Geography Vol 57, No 3 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.104992

Abstract

The availability of groundwater for irrigation in Purbalingga Regency, requires significant attention since the region has an extensive rice field, necessitating systematic groundwater exploration and the implementation of appropriate management strategies. A geoelectrical resistivity survey has been conducted to investigate groundwater resources and to construct a hydrostratigraphic model that facilitates the interpretation of hydrogeological conditions, including aquifer distribution, groundwater depth, and productive zones. Resistivity data were collected from 16 points distributed across the districts of Kalimanah, Purbalingga, Kemangkon, and Bukateja. The correlation of resistivity logs produced detailed hydrostratigraphic cross-sections, illustrating lithological variations, layer thicknesses, and aquifer distribution. Interpretation down to a depth of 200 m identified two major formations: the Alluvium Formation and the Terrace Formation. The Alluvium Formation, consisting of sandy clay, sand, and clayey sand, exhibits resistivity values ranging from 0.87 to 69.43 Ωm, whereas the Terrace Formation, composed of tuffaceous sandstone, sand, conglomerate, and tuff, with resistivity values between 7.81 and 38.09 Ωm. Hydrostratigraphic modeling indicates that aquifer productivity varies across the study area. Kalimanah District, dominated by low-resistivity deposits (0.87–8.55 Ωm), is interpreted as having the highest aquifer productivity, making it particularly suitable for the development of groundwater-based irrigation. This study introduces a resistivity-based interpretative approach to classify hydrostratigraphic characteristics by correlating resistivity values with local geological conditions.
The Identification of Faults using Magnetic Method in Kulonprogo, Yogyakarta, Indonesia Koesuma, Sorja; Sehah, Sehah; Munandar, Choirul Singgih
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 2 (2024): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i2.93369

Abstract

The aims of this study to identify faults and identify subsurface lithology using magnetic anomaly data in the Kulonprogo. In the acquisition was carried out using a Proton Procession Magnetometer (PPM) Geotron G5 with 62 measurement points and a distance of ±1 km between point. Measurements were made on Kebobutak (Tmok), Aluvium (Qa), Andesit (a), and Sentolo (Tmps) formations. The total magnetic field data processing is done with several correction, namely diurnal correction, IGRF, reduce to equator, upward continuation at an altitude of 2000 m, and reduce to pole, and 2D modelling using the forward modelling method. The result of the analysis obtained magnetic field anomaly values in the range of values -400 to 950 nT. The 2D modelling shows that the research area is composed of 4 dominating rock types, namely andesite rock with a susceptibility value of 94 x 10-3, andesite breccia rock with a susceptibility value of 29 x 10-3, clay rock with a susceptibility value of 0,013 x 10-3, and sandstone with a susceptibility value of 5 x 10-3. The identification result show the existence of faults line on Mount Watuaglik, Mount Kamal, and Mount Bodag.
Utilization of Satellite Gravimetric Data to Estimate the Location of the Magma Chamber of Slamet Volcano, Central Java, Indonesia Sehah, Sehah; Koesuma, Sorja; Prabowo, Urip Nur Wijayanto; Ikhwana, Aina Zahra
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 2 (2023): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i2.73923

Abstract

Satellite gravimetric data can be utilized to map the gravity anomaly on the earth's surface, especially for difficult, extreme, and large areas. In this study, satellite gravimetric data has been used to estimate the location of the magma chamber of Slamet volcano, Indonesia. Information on the magma chamber is very useful for knowing the volcanic characteristics and activity, thus helping pre-mitigation efforts to catastrophic eruptions that occur. The stages in the study which have been carried out include data access, correction, reduction, modeling, and interpretation. The satellite gravimetric data that has been accessed is GGMplus data. After several corrections and reductions are done, the complete Bouguer anomalies (CBA) data are obtained with values ranging from 11.889 – 117.429 mGal. Filtering process using the upward continuation has been applied to obtain regional anomalies data. The regional anomalies data are corrected to the CBA data, so that the residual gravity anomalies data are obtained. The lowest gravity anomaly value is located at positions of 109.21967 E and 7.24281 S which is interpreted to be the location of the magma chamber of Slamet Volcano that is currently still active. The result of modeling of the residual gravity anomalies data indicate that the position of the magma chamber of Slamet Volcano is estimated to be relatively under the cone with a density lower than the surrounding rock densities, i.e. 1.50 – 1.75 g/cm3. The study results have a good match with the geological map of the study area.
Two Dimensional Modeling of Basaltic Rocks Intrusion Based on The Local Magnetic Anomalies Data in Jatilawang District Banyumas Regency Sehah, Sehah; Raharjo, Sukmaji Anom; Prabowo, Urip Nurwijayanto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.41885

Abstract

Two dimensional modeling to basaltic rocks intrusion in Pekuncen and Karanglewas Villages Jatilawang District, Banyumas Regency, Central Java based on the local magnetic anomalies data has been carried out in March – June 2020. The amount of magnetic data obtained from the acquisition in the field was 239 data stretching in position of 109.107222° – 109.134944°E and 7.561361° – 7.577306°S, with the local magnetic anomalies values ranging of -2,961.11 – 1,516.31 nT. To model anomalous sources in the subsurface in two dimensions, then the local magnetic anomalies data is transformed into pseudogravity anomalies data, so that anomalous value can be obtained as -27.815 – 41.087 mGal. Based on the pseudogravity anomalous map, the basaltic rock intrusion is interpreted to be located in the eastern part of the research area, so modeling of anomalous sources is conducted in this area. The results of 2D-modeling to local magnetic anomalies data indicate the presence of anomalous object interpreted as basaltic rock intrusion with magnetic susceptibility contrast value of 0.0223 cgs, located at depth of 52.61 – 505.97 m and a lateral length of 1777.94 m. This rock intrudes sediment rock from the Halang Formation and is connected to other basaltic rock near the surface with magnetic susceptibility contrast value of 0.0165 cgs, located at depth of 1.94 – 80.90 m and lateral length of 751.83 m. The results of lithological interpretation are in accordance with the geological information of the research area.
Interpretasi Kualitatif Data Anomali Magnetik Residual Tereduksi ke Ekuator untuk Analisis Sebaran Rekahan Air Tanah (Studi Kasus: Desa Sumbang, Kecamatan Sumbang, Kabupaten Banyumas) Sehah, Sehah; Aziz, Abdullah Nur; Boli, Lusia Silfia Pulo; Ariyanto, Muhammad Rizki
Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2025: Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 2025
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/prosidingsnfa.v0i0.115738

Abstract

Secara geologis Desa Sumbang Kecamatan Sumbang Kabupaten Banyumas didominasi oleh endapan lahar dan lava Gunungapi Slamet. Penelitian ini bertujuan untuk mengidentifikasi pola sebaran rekahan air tanah pada komplek batuan vulkanik berdasarkan data anomali magnetik. Manfaat yang diharapkan adalah diperolehnya sumber air tanah yang melimpah di daerah penelitian untuk mendukung irigasi berbasis air tanah sebagai upaya mewujudkan ketahanan pangan dan pengembangan agrowisata. Akuisisi data magnetik telah dilakukan dengan resolusi spasial sebesar 100 m dan menghasilkan data intensitas magnetik total. Pengolahan data telah dilakukan dengan menerapkan beberapa koreksi dan reduksi sehingga dapat diperoleh data anomali magnetik lokal yang berkisar -3.089,49 – 1.502,98 nT. Untuk mereduksi efek-efek dipol magnetik yang mengganggu interpretasi, maka dilakukan reduksi data ke ekuator terhadap data anomali magnetik lokal. Hasilnya adalah data anomali magnetik dengan nilai berkisar -2.056,54 – 2.264,55 nT. Untuk memetakan sebaran rekahan air tanah pada komplek batuan vulkanik, maka dilakukan perhitungan first horizontal derivative (FHD) terhadap data anomali magnetik lokal tersebut. Gradien yang dihasilkan berkisar 0,24 – 22,72 nT/m. Nilai-nilai gradien horizontal ini cenderung membentuk ridge di atas perubahan magnetisasi yang tiba-tiba. Banyaknya ridge pada peta kontur mengindikasikan keberadaan batas-batas kontak litologi antar batuan bawah permukaan yang dapat diinterpretasi sebagai rekahan air tanah di daerah penelitian.
Co-Authors Abdullah Nur Aziz Abdullah Nur Aziz Addailamy, Faizah Ayu Anas, Almas Atilya Aini Ardhana Reswara P.A. Ariyanto, Muhammad Rizki Arya Dwi Candra Boli, Lusia Silfia Pulo Chandra Adi Prasetyo, Chandra Adi Dwi Kartika Ferdiyan, Akmal Hartono Hartono Hasby, Esa Pallewi Ikhwana, Aina Zahra J. Aminuddin Koesuma, Sorja Maghfiroh, Fatkhiyatul Mubarak, Fuad Munandar, Choirul Singgih Mutaabidah, Insyahita Akmalia Prabowo*, Urip Nurwijayanto Prabowo, Urip Nur Wijayanto Priyadi, Pujo Pulo Boli, Lusia Silfia Sa'adah, Fajar Nur Sugito - Sukmaji Anom Raharjo Sunardi Sunardi Urip Nurwijayanto Prabowo, Urip Nurwijayanto Utami, Aviyatna Fikri Zaroh Irayani