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All Journal BERKALA FISIKA Bulletin of Scientific Contribution : Geology Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Riset dan Kajian Pendidikan Fisika IJOG : Indonesian Journal on Geoscience JFA (Jurnal Fisika dan Aplikasinya) Jurnal Geosaintek Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Jurnal Fisika FLUX Journal of Geoscience, Engineering, Environment, and Technology INDONESIAN JOURNAL OF APPLIED PHYSICS Communications in Science and Technology Risalah Fisika Jurnal Geofisika Indonesian Journal on Geoscience Indonesian Journal on Geoscience Aceh International Journal of Science and Technology Jurnal Geosaintek

Sukmaji Anom Raharjo

Department Of Physics, Jenderal Soedirman University

Author-ID : 836767

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 Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Other

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Interpretation of 2D-Subsurface Resistivity Data in The Iron Ore Prospect Area of Eastern Binangun Coastal, Regency of Cilacap, Central Jawa Muhammad Sehah; Sukmaji Anom Raharjo; Fajar Destiani
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

Interpretation of 2D-subsurface rock resistivity data has been carried out in the iron ore prospect area of Eastern Binangun Coastal in Cilacap Regency, Central Java. The background of this research is the potential for abundant iron sand in this area that prospects to be exploited. The research was conducted using a magnetic method in 2017 to map the distribution patterns of the local magnetic anomalies that were interpreted to originate from the distribution of iron ore in the subsurface. In 2018, the research continued using the 2D-resistivity method to find out the lithology section in the subsurface of research area. 2D-resistivity data acquisition is carried out on four tracks consisting of Bng-01 to Bng-04. The resistivity data modeling have produced the true resistivity value for each track in the form of the subsurface resistvity section, which including the Bng-01 track is 2.27 – 44.1 Ωm; the Bng-02 track is 4.5 – 58.6 Ωm; the Bng-03 track is 6.37 – 63.4 Ωm; and the Bng-04 track of 4.98 – 83.3 Ωm. After interpretation process, some models of subsurface rocks lithology section is obtained under the four trajectories. The rocks resulted from interpretation process consists of sand which inserted with gravel (> 58.6 Ωm); sand containing iron ore grains (28.2 – 83.3 Ωm), clayey sand (11.1 – 32.9 Ωm), sandy clay (4.98 – 13.5 Ωm), and fine sand which intruded by saltwater (<6.49 Ωm). Sand containing iron ore grains is main part of the coastal aquifer so that exploitation of iron sand has the potential to reduce aquifer function in storing and flowing of groundwater and causing of abrasion in the Eastern Binangun Coastal area.

A Geophysical Survey with Magnetic Method for Interpretation of Iron Ore Deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia Muhammad Sehah; Sukmaji Anom Raharjo; Azmi Risyad
Journal of Geoscience, Engineering, Environment, and Technology Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020
Publisher : UIR PRESS

Geophysical survey with magnetic method to interpret the iron ore deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia was carried out during six month, i.e. March –August 2017, covering the area in the geographical position of 109.3462° – 109.3718° E and 7.6958° – 7.7098° S. This survey has produced total magnetic field strength data at each measuring point in the research area. The magnetic field strength data which have been obtained, then be processed, corrected, and mapped so that the local magnetic anomaly contour map can be obtained. The local magnetic anomaly contour map shows the distribution of magnetic anomalous sources in the subsurface of research area. The 2D-modeling of magnetic anomalies data has been carried out along the AB trajectory extending on the local magnetic anomaly contour map from the position of A(109.3463°E and 7.7023°S) to B (109.3688°E and 7.7053°S), so that some subsurface anomalous objects is obtained. The modelling results of magnetic anomalies data show that the research area is estimated to have the potential of iron ore deposits. The subsurface rocks deposits containing iron ore are estimated to be located below the AB trajectory with a length about of 164.85 meters, a depth ranging of 1.709 – 31.909 meters, and a magnetic susceptibility value of 0.0122 cgs unit. These rocks are interpreted as sand deposits which coexists with silt and clay containing iron ore grains from the alluvium formation. Further, iron ore is also estimated to be present in the rocks deposits below the AB trajectory which have a depth of 24.405 – 49.809 meters and 3.989 – 11.111 meters, with the magnetic susceptibility values of 0.0093 and 0.0073 cgs units.

Eksplorasi Potensi Pasir Besi di Pesisir Barat Kecamatan Nusawungu Kabupaten Cilacap Berdasarkan Data Resistivitas Batuan Bawah Permukaan Sukmaji Anom Raharjo; Muhammad Sehah
Jurnal Fisika dan Aplikasinya Vol 14, No 3 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Eksplorasi geofisika untuk mengestimasi potensi pasir besi di pesisir barat Kecamatan Nusawungu Kabupaten Cilacap telah dilakukan pada bulan Mei – Juli 2017 menggunakan metode geolistrik resistivitas. Pengukuran data resistivitas dilakukan di 6 titik lokasi yang diperkirakan prospek mengandung bijih besi berdasarkan peta anomali magnetik lokal daerah penelitian yang membentang pada posisi geografis 109,3143° – 109,3445°BT dan 7,6908° – 7,7091°LS. Survei geolistrik resistivitas bertujuan untuk memperkirakan kedalaman dan ketebalan endapan pasir besi serta potensinya. Berdasarkan hasil pemodelan dan interpretasi data resistivitas diperoleh endapan pasir besi yang berselingan dengan lanau dan lempung dari formasi alluvium di seluruh titik lokasi. Endapan pasir besi ini memiliki nilai resistivitas 12,24 – 46,96 Ωm dan kedalaman berkisar 2,39 – 27,81 meter. Berdasarkan hasil eksplorasi menggunakan metode geolistrik resistivitas, potensi pasir besi di kawasan pesisir barat Kecamatan Nusawungu Kabupaten Cilacap diperkirakan cukup besar

Pengembangan model pelatihan pembuatan peta kontur topografi untuk mengidentifikasi dini zona-zona rawan bencana longsor di Kabupaten Banjarnegara Sehah Sehah; Abdullah Nur Aziz; Sukmaji Anom Raharjo
Jurnal Riset dan Kajian Pendidikan Fisika Vol 3, No 2 (2016): Vol 3: Oktober 2016
Publisher : Universitas Ahmad Dahlan

Pengembangan model pelatihan pembuatan peta kontur topografi untuk mengidentifikasi dini zona-zona rawan bencana longsor telah dilaksanakan di Sekolah Menengah Kejuruan (SMK) Negeri 1 Mandiraja Kabupaten Banjarnegara. Kegiatan bertujuan untuk melakukan sosialisasi teknis dasar pemetaan dan pelatihan teknis pembuatan peta kontur topografi menggunakan perangkat lunak Surfer untuk mengidentifikasi dini zona-zona rawan bencana tanah longsor di Kabupaten Banjarnegara. Metode yang digunakan adalah perpaduan ceramah dan diskusi yang dipadukan dengan praktek. Setelah dilakukan pelatihan, sebagian besar peserta memberikan respon positif dan terdapat keinginan untuk mengimplementasikan dan menyebarluaskan hasil-hasil pelatihan. Indeks capaian rata-rata keberhasilan pelatihan berdasarkan hasil pengisian kuisioner adalah 75,69% dengan indeks capaian tertinggi adalah 92,24% dan indeks capaian terendah adalah 56,90%. Tingkat pemahaman peserta terhadap materi pelatihan cukup baik, meskipun masih perlu ditingkatkan. Hal ini dapat dilihat dari hasil rekapitulasi nilai pre-test dan post-test. Nilai rata-rata pre-test adalah 5,96 dan post-test adalah 6,95. Dengan demikian terdapat kenaikan nilai sebesar 12,14%. Salah satu faktor keberhasilan pelatihan adalah adanya dukungan dari pihak sekolah dan tersedianya fasilitas komputer di Laboratorium Komputer SMK Negeri 1 Mandiraja. Salah satu faktor penghambatnya adalah banyaknya peserta kegiatan yang kesulitan dalam mempraktekkan penggunaan perangkat lunak Surfer untuk membuat peta kontur, sehingga diperlukan bimbingan teknis lanjutan. The development of the training model of creating of the topographic contour map to early identify the landslide gristle zones has been done in the First State Vocational Middle School (SMK) of Mandiraja, Regency of Banjarnegara. The purpose of this activity is to do technical socialization of basic of mapping and technical training of creating of the topographic contour map using the Surfer software to early identify the landslide gristle zones in the Regency of Banjarnegara. The method used in the training is combination of lecture, discuss, and practical. After this activities has been done, the largely participant give positive response and there is wish to implement and disseminate the activities results. The successfulness average attainment index of this training based on the quiz inlay result is 75.69%; with highest index is 92.24% and lowest index is 56.90%. The understanding of participant of the training on the training matters have rather good although still need be improved. It can be known from recapitulation results of pre-test and post-test values. The average pre-test value is 5.96 and the average post-test value is 6.95. Thus, there is a ascension from pre-test value to post-test value about of 12.14%. One of the successfulness factors of the activity is supporting from the chairman of school and available of computer in the Computer Laboratory of the First State Vocational Middle School (SMK) of Mandiraja. And one of the resistance factors is many participants which have difficulty to practice how procedure of utilizing of the Surfer software to create a contour map, so required by advanced technical guidance.

Interpretation of Magnetic Anomaly Data in the Andesitic Rock Prospect Area of Kutasari Subregency, Purbalingga Regency, Central Java, Indonesia Sehah Sehah; Sukmaji Anom Raharjo; Urip Nurwijayanto Prabowo; Dwi Setiawan Sutanto
Indonesian Journal on Geoscience Vol 8, No 3 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.3.345-357

DOI:10.17014/ijog.8.3.345-357Interpretation of magnetic anomaly data has been carried out in the andesitic rock prospect area, Kutasari Subregency, Purbalingga Regency, Central Java, Indonesia. Geographically, this area is located within 109.2788° - 109.3072°E and 7.3032° - 7.3319°S. The study has been done in April – September 2019 with the purpose to map the distribution of andesitic rocks based on the local magnetic anomaly data. The data that are acquired in this study have the values ranging between -1,238.13 - 1,892.40 nT. The results of qualitative interpretation on the local magnetic anomaly data having been reduced to the pole show the distribution of strong anomalous sources in the northwest area interpreted as massive andesitic rocks. Whereas the results of quantitative interpretation through 2D-forward modeling on the local magnetic anomaly data show six anomalous bodies, with magnetic susceptibility values ranging from 0.0025 to 0.0350 cgs and depths range between 7.16 - 505.97 m. The highest magnetic susceptibility is 0.0350 cgs interpreted as a massive andesite intrusion forming a very dense dike; whereas the lowest magnetic susceptibility is 0.0025 cgs interpreted as undifferentiated igneous rocks, volcanic breccias, lava, and tuff. Based on the study results, the correlation between the results of qualitative and quantitative interpretations occurs.

Perhitungan Temperatur Reservoir Panas Bumi Mata Air Panas Daerah Bantarkawung Menggunakan Metode Geotermometer Na-K Dan Entalpi-Silika Sachrul Iswahyudi; Laskarul Wildan Attabik; Rachmad Setijadi; Sukmaji Anom Raharjo
Jurnal Geosaintek Vol 5, No 1 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Manifestasi panas bumi yang muncul di daerah Bantarkawung dan sekitarnya sebagai refleksi sistem panas bumi adalah berupa mata air panas. Penelitian ini terkait pada dua mata air panas yaitu Mata Air Panas Cipanas dan Mata Air Panas Cilakar. Penelitian ini juga menggunakan dua mata air meteorik yaitu Mata Air Meteorik Warudoyong dan Mata Air Meteorik Cilimus sebagai data penunjang. Penelitian ini menggunakan analisis metode geokimia yang diolah berdasarkan data penelitian terdahulu untuk mengetahui tipe air panas bumi, geoindikator dan kesetimbangan fluida. Penentuan temperatur panas bumi daerah penelitian menggunakan dua metode yaitu metode geotermometer Na-K yang berdasar pada kandungan natrium dan kalium mata air panas dan metode diagram silika-entalpi yang berdasar kandungan silika dan entalpi mata air panas serta air meteorik. Berdasarkan analisis geoindikator Cl-Li-B, diinterpretasikan terdapat 2 sistem panas bumi dengan reservoir yang berbeda pada daerah penelitian yaitu Reservoir Cipanas dan Cilakar. Berdasarkan plot Na-K-Mg untuk mengetahui kesetimbangan fluida, MAP Cipanas merupakan fluida partial equilibrium sedangkan MAP Cilakar adalah fluida immature water. Temperatur panas bumi berdasarkan metode geotermometer Na-K adalah 80oC untuk MAP Cipanas dan 60oC untuk MAP Cilakar. Sedangkan berdasarkan metode silika entalpi adalah 145oC untuk MAP Cipanas dan 164oC untuk MAP Cilakar.

APPLICATION OF MAGNETIC SURVEY TO EXPLORE THE IRON ORE DEPOSITS IN THE NUSAWUNGU COASTAL REGENCY OF CILACAP CENTRAL JAVA S Sehah; Sukmaji Anom Raharjo
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 7 No. 2 (2017)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v7n2.p79-88

The research aiming to explore the iron ore deposits in the Nusawungu coastal Regency of Cilacap has been conducted using the magnetic survey. The acquisition of magnetic data was conducted in April Mei 2017, covering the area in the ranges of 109.314° 109.345°E and 7.691° 7.709°S. The obtained magnetic field strength data were corrected, reduced, and mapped to obtain the contour map of local magnetic anomaly. The modeling process was carried out along the path extending over the map from the positions of 109.314°E and 7.695°S to 109.335°E and 7.699°S, so that some subsurface anomalous objects are obtained. The lithological interpretation was performed to identify the types of subsurface rocks and their formations based on the magnetic susceptibility value of each anomalous objects and supported by the geological information of the research area. Based on the interpretation results, three rocks deposits of alluvium formations were obtained, which are estimated to contain iron ore. The first deposit has a length of 164.85 m, a depth of 0.57 8.43 m, and a magnetic susceptibility value of 0.0097 cgs. The second deposit has a length of 376.28 m, a depth of 2.56 19.66 m, and a magnetic susceptibility value of 0.0108 cgs. The third deposit has a length of 1,306.26 m, a depth of 3.70 58.69 m, and a magnetic susceptibility value of 0.0235 cgs. Out of the whole rocks deposits, the third rock deposit is interpreted to have the most prospective iron ore. This interpretation based on its high magnetic susceptibility value, which indicates the presence of many magnetic minerals (i.e. iron ores) in the rock.

Coastal Hydrogeological Model in the Iron Ore Prospect Area of Widarapayung Coastal, Cilacap Regency Based on 2D-Resistivity Data Sehah Sehah; Sukmaji Anom Raharjo; Abdullah Nur Aziz
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

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 Î©m; WP-02 with the values of 3.67-121.00 Î©m; WP-03 with the values of 3.86-78.40 Î©m; WP-04 with the values of 1.79-100.00 Î©m; and WP-05 with the values of 2.61-86.20 Î©m. 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.

Identifikasi Lapisan Geologi Bawah Permukaan Berdasarkan Data Geomagnetik di Sungai Logawa Banyumas Sukmaji Anom Raharjo; Sehah Sehah; Adi Candra
Dinamika Rekayasa Vol 10, No 1 (2014): Jurnal Ilmiah Dinamika Rekayasa - Februari 2014
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2014.10.1.63

Identification of geological resources can be done either using surface mapping and cross sectional stratigraphy measurement or geophysical approximation beneath the earth surface. Geomagnetic exploration related to the existing of gold mineral begins with the total magnetic field intensity measurements at 173 locations was scattered in 109.196970 - 109.207580E and 7.448830 - 7.454110S. Interpretation from processing of data obtained four anomalous object, which is defined as fine-medium sandstone (χ= 0.0015 cgs units), coarse sandstone and compact (χ= 0.0035 cgs units), igneous basalt-andesite old Slamet (χ= 0.0085 cgs units), and the complex bedrock (χ= 0.0145 cgs units). The presence of gold mineralization in the rock throughout geomagnetic surveys used to identification of subsurface geological which is interpreted from the processing data that indicated the presence of gold in association with sedimentary (sandstone) is often referred to as sediment-hosted.

SURVEI METODE SELF POTENTIAL MENGGUNAKAN ELEKTRODA POT BERPORI UNTUK MENDETEKSI ALIRAN FLUIDA PANAS BAWAH PERMUKAAN DI KAWASAN BATURADEN KABUPATEN BANYUMAS JAWA TENGAH Sehah Sehah; Sukmaji Anom Raharjo
Jurnal Fisika FLUX Vol 8, No 1 (2011): Jurnal Fisika Flux Edisi Februari 2011
Publisher : Lambung Mangkurat University Press

Self Potential research has been done in the area of geothermal prospectsof Slamet Volcano, with locations is at around the hot water sources of PancuranTujuh Baturaden, District of Banyumas, Central Java. Tools used in this study wereporous pot electrodes and digital milivoltmeter that have very high input impedance.Dimension of research area are 24 x 24 square meters, with the number ofmeasurement points are 112 point. The electrode configuration used is the fixedmodel that is by keeping one electrode fixed at the reference point, while the otherelectrode moved at any interval in accordance with the direction of trajectory in theresearch area. According to the results obtained is known that the highest potentialdata obtained is -2.20 mV, the lowest data is -40.83 mV, and then the average data is-16.40 mV. According to the contour map of iso-potential obtained is known that thestudy area is a conductive zone, which probably contains of sulfide minerals in thesubsurface hot fluid. This is indicated by the low value of the measured self potential(its value are negative). According to qualitative and quantitative interpretation, knownthat the flow of subsurface hot fluid in following the change of research areatopography and self potential anomalies. The subsurface hot fluid in research area ispredicted flow from southern to northern.

Co-Authors Abdullah Nur Aziz Abdullah Nur Aziz Abdullah Nur Aziz Arya Dwi Candra Attabik, Laskarul Wildan Aziz, Abdullah Nur Azmi Risyad Candra, Adi Chandra Adi Prasetyo, Chandra Adi Destiani, Fajar Dwi Setiawan Sutanto Fajar Destiani Ferdiyan, Akmal Ikhwana, Aina Zahra Laskarul Wildan Attabik Muhammad Andi Kurniawan Muhammad Sehah Muhammad Sehah Muhammad Sehah Prabowo*, Urip Nurwijayanto Prabowo, Urip Nurwijayanto Priyadi, Pujo Rachmad Setijadi Rachmad Setijadi, Rachmad S Sehah Sa'adah, Fajar Nur Sa'adah, Nailis Sachrul Iswahyudi Sehah Allasimy Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah Sehah, Muhammad Sehah, S Sehah, Sehah Sehah, Sehah Sutanto, Dwi Setiawan Urip Nurwijayanto Prabowo Urip Nurwijayanto Prabowo Urip Nurwijayanto Prabowo, Urip Nurwijayanto Zaroh Irayani

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