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All Journal JTSL (Jurnal Tanah dan Sumberdaya Lahan) Transformasi: Jurnal Pengabdian Masyarakat Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Geosaintek Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology Civil Engineering Dimension Jurnal GEOSAPTA Jurnal Kelautan Nasional Dharma Bakti Indonesian Journal of Community Services Dinamika Journal : Pengabdian Masyarakat Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Earth and Marine Technology (JEMT) Industrial Research Workshop and National Seminar Prosiding University Research Colloquium Darma Sabha Cendekia Jurnal Profesi Insinyur Indonesia Jurnal Geosaintek Jurnal Pengabdian Masyarakat Terapan Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Sachrul Iswahyudi
Jurusan Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman
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Analisis Zona Permeabel Fluida Sistem Panas Bumi Gunungapi Slamet Berdasarkan Analisis Kerapatan Kelurusan Citra SRTM Dan Struktur Geologi Iswahyudi, Sachrul; Widagdo, Asmoro; Pratama, Bela Agung
Dinamika Rekayasa Vol 12, No 1 (2016): Dinamika Rekayasa Februari 2016
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2016.12.1.140

Abstract

Keberadaan manifestasi panasbumi di sekitar Gunungapi Slamet tidak dapat dipisahkan dari zona-zona permeabilitas yang berkembang. Lokasi-lokasi lulus air tersebut (zona permeabel) yang memungkinkan terbentuknya sirkulasi fluida tempat air masuk untuk mengisi reservoir panas bumi dan air keluar ke permukaan bumi sebagai manifesatasi mata air panasbumi di sekitar Gunungapi Slamet. Publikasi yang berupa hasil penelitian ini mencoba mengidentifikasi zona-zona permeabel tersebut berdasarkan anaslisis kerapatan kelurusan yang terekam dalam citra SRTM. Identifikasi kelurusan-kelurusan pada citra berdasarkan komponen-komponen interpretasi citra, yaitu tona, tekstur, pola, bentuk dan relief. Hasil analisis tersebut dikompilasi dengan data struktur geologi regional yang sebelumnya telah diidentifikasi dan data lapangan berupa manifestasi mata air panas. Lokasi-lokasi dengan kerapatan kelurusan yang tinggi pada citra SRTM umumnya bersesuaian dengan zona struktur geologi regional keberadaan manifestasi mata air panas. Daerah tersebut memanjang relatif utara-selatan di bagian barat dan timur-barat di bagian selatan peta. Daerah-daerah inilah yang merupakan daerah lulus air tempat fluida bersirkulasi membentuk sistem panasbumi Gunungapi Slamet.
Sistem Panasbumi Daerah Wanayasa, Banjarnegara Iswahyudi, Sachrul
Dinamika Rekayasa Vol 13, No 1 (2017): Dinamika Rekayasa - Februari 2017
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2017.13.1.166

Abstract

Terdapat keberadaan beberapa manifestasi panasbumi berupa kolam air panas di lokasi penelitian Daerah Wanayasa, Banjarnegara. Berdasarkan informasi awal tersebut, dilakukan penelitian di dua kolam air panas di lokasi penelitian, yaitu kolam air panas Kaliputih dan Tempuran, yang bertujuan mengetahui karakteristik sistem panasbumi di lokasi penelitian dan sekitarnya. Penelitian ini menggunakan metode geokimia untuk mengetahui beberapa parameter karakteristik fluida panasbumi yang membentuk Sistem Panasbumi Wanayasa. Sampel air panasbumi dari dua lokasi manifestasi Kaliputih dan Tempuran dianalisis di laboratorium untuk mengetahui tipe air, geoindikator, dan geotermometer panasbumi untuk mendapatkan informasi model sistem panasbumi Daerah Wanayasa. Manifestasi kolam air panas Kaliputih dan Tempuran termasuk tipe air panasbumi bikarbonat dan sulfat-klorida. Tipe air panasbumi tersebut diperkirakan terbentuk di daerah outflow dan upflow sistem panasbumi. Analisis geoindikator menunjukkan kedua air kolam air panas Kaliputih dan Tempuran berasal dari satu reservoir yang sama, yaitu Reservoir Tempuran. Analisis geotermometer menunjukkan Reservoir Tempuran memiliki temperatur 168oC. Diperlukan penelitian lebih lanjut untuk mengetahui temperatur reservoir yang lebih akurat, asal dan recharge area air panasbumi di kedua lokasi tersebut untuk konservasi dan kelestarian sumberdaya alam ini
The conceptual model of Wae Sano Geothermal field based on geology and geochemistry data Widiatmoko, Fajar Rizki; Hadi, Mochammad Nur; Kusnadi, Dedi; Iswahyudi, Sachrul; Fadlin, Fadlin
Journal of Earth and Marine Technology (JEMT) Vol 1, No 1 (2020)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2020.v1i1.1189

Abstract

Wae Sano volcano is included in the inner Banda arc, Mount Wae Sano is a type C volcano and formed the Sano Nggoang crater lake. The magmatism activity produces geothermal manifestations such as; hot spring, rock alteration, and sulfur deposits, the hottest water temperature is 81 0C, with neutral pH, but the Sano Nggoang Lake water has acid pH. It becomes interesting to examine the characteristics of the geothermal system in that area. The research was conducted by Volcanostratigraphic studies to reconstruct the geological process and Geochemical sampling of hot springs, lake water, ground air, and the soil side to understand the subsurface characterization. The result showing some period of volcano products, with the youngest come from the product of Sano Nggoang 2 that spills its product to on the north-east side of Poco Dedeng volcano. The geochemical analysis shows all manifestations originate from one reservoir, chloride water type, NaCl type of the lake water with a few SO4 influence, presumably, the hot springs supply is influenced by seawater, the estimation of the reservoir has a temperature about ± 230 0C, with dacite and the rich organic sedimentary rock, and located at ± 1456 m from the manifestation, the isothermal section shows the rate of temperature increase at 97.07 m / 10 0C. The hypothetical resource is counted about 1,488.6 kWe.
STRUKTUR GEOLOGI AREA BENCANA TANAH LONGSOR DI DESA TUMENGGAL, KECAMATAN PENGADEGAN-PURBALINGGA Widagdo, Asmoro; Iswahyudi, Sachrul; Laksono, Anjar Tri
Prosiding Seminar Teknologi Kebumian dan Kelautan Vol 3, No 1 (2021)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/p.semitan.2021.1959

Abstract

The Ligung Formation which is predominantly composed of claystone and the Kalibiuk Formation which is composed of volcanic breccias, both of which landslide simultaneously on the hillsides in the Tumenggal area, Pengadegan District, Purbalingga-Central Java. How the influence of the geological structure that has worked to compose the geological order of this area, which has an effect on the occurrence of the landslide, is the study that is revealed in this paper. Field observations of landslide locations were carried out by determining the position of the landslide, determining the type of bedrock, measuring the direction of the slope, measuring the dipping of rock layers and describing the distribution of landslides in the study area. The geological structures found in the study area are rock layers of the Ligung and Kalibiuk Formation and rock fractures/joints. Little dipping structure of the bed was observed in the field while intensive jointing was found in claystone. This structure has accelerated the weathering of claystone to form a thick soil. Andesite breccia found at the bottom of the slope has undergone intensive weathering. Rocks in the study area have a slope to the south and landslides to the north or towards the fore-slope, this is formed due to thick soil and intensive fractures/joints in the bedrock.
The Origin of Geothermal Water Around Slamet Volcano - Paguyangan - Cipari, Central Java, Indonesia Sachrul Iswahyudi; Indra Permanajati; Rachmad Setijadi; Januar Aziz Zaenurrohman; Muhamad Afirudin Pamungkas
Journal of Geoscience, Engineering, Environment, and Technology Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2020.5.4.4112

Abstract

The existences of several hot springs between Slamet volcano, Paguyangan, and Cipari Districts raised questions regarding their origin. Several studies have been conducted related to the hydrothermal system at the location. Subsequent studies are needed to understand the hydrothermal system at the research site for the sustainability and conservation of geothermal natural resources. This research has reviewed several previous studies plus the latest information on the origin of hot spring water with the help of deuterium (2H) and 18O isotopes. This study used geochemical analysis of hot springs (geothermal) and local meteoric water to obtain information on isotope values. This was used for the interpretation of the origin of geothermal water. This study also used regional geological analysis methods for the interpretation of the mechanism for the emergence of these hot springs. The results of the analysis informed that the origin of hot water was local meteoric water. The geological structure was weak enough to allow water from the geothermal reservoir to reach the surface and meteoric water into the reservoir.
Integrated Subsurface Analysis of Thickness and Density for Liquefaction Hazard: Case Study of South Cilacap Region, Indonesia. Maulana Rizki Aditama; Huzaely Latief Sunan; FX Anjar Tri Laksono; Gumilar Ramadhan; Sachrul Iswahyudi; Fadlin
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.1.5892

Abstract

The thickness of the liquefable layer can be the factor inducing liquefaction hazard, apart from seismicity. Several studies have been conducted to predict the possibility of the liquefable layer based on the filed sampling. However, a detailed investigation of the subsurface interpretation has not been defined, in particular the thickness estimation of the liquefable layer. This study is carried out in south Cilacap area where potential liquefaction is exists due to the earthquake history data and near surface condition. The aim of this study is to investigate the physical properties and thickness distribution using GGMplus gravity data and resistivity data. This research is conducted by spectrum analysis of gravity model and 2D resistivity model . This study’s main results is by performing the residual gravity anomaly with the associated SRTM/DEM data to define the subsurface physical distribution and structural orientation of the area. Residual gravity anomaly is also separated through the low pass filter in order to have robust interpretation. The residual anomaly indicates that the area has identical structural pattern with geological and SRTM map. The results show a pattern of high gravity index in the northeast area of ​​the study having range of 70 – 115 MGal gravity index, associated with the volcanic breccia, and a low gravity profile with less than 65 in the southwest, associated with the alluvial and water table dominated distribution. The thickness of Alluvial is determined by resistivity model with H1 at a range of 3 meters and H2 at a range of 4 m. This research is included in the potential liquefaction category with the potential for a large earthquake.
SOSIALISASI ANCAMAN ERUPSI GUNUNG SLAMET TERHADAP WILAYAH KABUPATEN BANYUMAS-JAWA TENGAH Asmoro Widagdo; Sachrul Iswahyudi; Anjar Trilaksono; Indra Permana Jati; Gentur Waluyo
Dinamika Journal : Pengabdian Masyarakat Vol 3, No 2 (2021)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dj.2021.3.2.1553

Abstract

Slamet volcano is one of the active volcanoes in Central Java which is located on the north side of Banyumas Regency, Central Java. The southern slope of this mountain is a protected forest area, hiking trails to the top and tourist areas. The threat of a volcanic eruption needs to be socialized to residents in areas that have the potential to be affected by an eruption disaster if one day it occurs. Knowledge and awareness of residents and the public visiting tourist areas need to be built through socializing the threat of Mount Slamet eruption. The method used in this community service is through a series of literature review activities, field observations and socialization to the community. Socialization has been carried out to the community of small traders, tourism workers and visitors/tourists.Keywords: mountain, eruption, tourism, community, socialization.                          
Interpretasi Struktur Geologi Berdasarkan Fault Fracture Density (FFD) dan Implikasinya Terhadap Potensi Likuefaksi di Daerah Kalibening, Kabupaten Banjarnegara, Jawa Tengah Huzaely Latief Sunan; Akhmad Khahlil Gibran; Maulana Rizki Aditama; Sachrul Iswahyudi; Fajar Rizki Widiatmoko; Asmoro Widagdo; FX Anjar Tri Laksono
EKSPLORIUM Vol 42, No 1 (2021): Mei 2021
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.1.6129

Abstract

ABSTRAK Keberadaan struktur geologi sering dikaitkan dengan bencana tanah longsor dan gempa bumi. Daerah Kalibening merupakan lokasi yang cukup menarik untuk dilakukan penelitian terkait hal tersebut. Daerah ini tersusun atas satuan batuan berumur Pleistosen dan Resen. Berdasarkan stratigrafinya, batuan tersebut terpotong oleh struktur sesar. Hal ini berarti menjadikan sesar di daerah tersebut termasuk dalam kategori sesar aktif. Morfologi yang tinggi dengan suatu cekungan di tengahnya mengindikasikan bahwa daerah tersebut pembentukannya dipengaruhi oleh sesar. Penelitian ini bertujuan untuk menentukan pola struktur geologi yang mengontrol daerah penelitian. Untuk menentukan pola struktur geologi, digunakan metode pemetaan struktur Fault Fracture Density (FFD) yang dikombinasikan dengan peta residual anomali Bouguer dan peta kelurusan hillshade. Secara umum, hal yang paling penting dalam mempelajari struktur geologi adalah geometri elemen struktur. Model konseptual struktur geologi selanjutnya digunakan untuk menganalisis potensi likuefaksi yang ada pada daerah penelitian. Interpretasi struktur menunjukkan adanya sesar mendatar dekstral yang diikuti sesar-sesar penyerta dan cekungan pull-apart yang diduga merupakan hasil pensesaran normal yang timbul dari mekanisme strike-slip. Sesar mendatar dekstral ini menghasilkan cekungan yang terisi oleh sedimen lepas yang rentan mengalami likuefaksi jika terjadi gempa bumi dan gerakan tanah. Kajian ini menyimpulkan bahwa daerah Kalibening rentan terjadi likuefaksi karena adanya pergerakan sesar mendatar dekstral, sedimen lepas yang mendominasi daerah penelitian, dan muka air tanah yang dangkal. ABSTRACT The existence of geological structures is often associated with landslides and earthquakes. The Kalibening area is an interesting location for research on that purpose. This area is composed of Pleistocene and Recent rocks units. Based on its stratigraphy, the rocks in the area are truncated by fault structure. It means that the fault in the area is categorized as an active fault. The high morphology and a basin existence on its center indicate that the area formation was controlled by faults. The research is carried out to determine the trend of the geological structures that control the study area. To determine the trend of the geological structure, a structural mapping method of Fault Fracture Density (FFD) map combined with the Bouguer anomaly residual map and hillshade lineaments map is used. In general, the most important thing in the study of structural geology is the geometry of the structural elements. The conceptual model of geological structures is subsequently used to analyze the liquefaction potential of the study area. The interpretation of the structures shows the existence of dextral strike-slip fault followed by companion faults and pull-apart basin that is inferred as the result of normal faulting in the strike-slip mechanism. The dextral strike-slip fault produces a basin filled with loose sediment that is prone to liquefaction in the event of an earthquake and ground motion. This study concludes that the Kalibening area is prone to liquefaction due to the existence of the movement of dextral strike-slip fault, loose sediments that dominate the study area, and shallow groundwater table.
KONTROL STRUKTUR GEOLOGI PADA KEMUNCULAN MATA AIR PANAS BUMI DAERAH SUBANG, JAWA BARAT Sachrul Iswahyudi; Muhamad Afirudin Pamungkas; Huzaely Latief Sunan; Maulana Rizki Aditama
Jurnal Geosaintek Vol 5, No 3 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v5i3.6237

Abstract

Mata air panas Ciniru dan Subang terletak dibagian tenggara Gunung Ciremai, tepatnya terletak di Desa Subang, Kecamatan Subang, Kabupaten Kuningan, Jawa Barat. Terdapat 3 manifestasi panas bumi berupa mata air panas di Daerah Subang, yaitu 2 mata air panas di Daerah Ciniru dan 1 mata air panas Daerah Subang. Mata air panas Ciniru 1 keluar dari litologi batulempung, terdapat beberapa keluaran pada satu lokasi yang saling berdekatan, memiliki sinter travertin, rasa asin dan warna air berwarna coklat. Mata air panas Ciniru 2 keluar dari rekahan batuan yang terdapat di bawah tebing dengan litologi batupasir. Sedangkan mata air panas Subang keluar dari rekahan batupasir. Penelitian ini menggunakan metode pemetaan geologi, analisis anomali gaya berat, dan geokimia air mata air panas. Ketiga mata air panas terletak pada suatu kelurusan struktur geologi yang berarah relatif utara-selatan. Kehadiran stuktur geologi mengontrol kemunculan mata air panas di daerah penelitian. Beberapa struktur yang ditemukan adalah sesar mendatar kiri, sesar naik, dan lipatan sinklin dan antiklin. Berdasarkan analisis anomali residual dan geologi menunjukan perbedaan anomali yang signifikan yang kemudian diinterpretasikan sebagai daerah dengan litologi kompak batuan beku dengan densitas 2.8 - 3.1 gr/cm3; dan zona permeabel struktur geologi dengan densitas 1.97 - 2.6 gr/cm3. Ketiga manifestasi masuk dalam tipe air klorida, memiliki satu reservoir yang sama, memiliki temperature dari 136°C-159°C, dan tergolong sebagai sistem panas bumi temperatur sedang. 
DYNAMOTHERMAL METAMORPHIC SEBAGAI PROVENANCE ENDAPAN SEDIMEN DAERAH ALIRAN SUNGAI KALIGARANG SEMARANG BERDASARKAN ANALISIS MINERAL BERAT FX Anjar Tri Laksono; Asmoro Widagdo; Sachrul Iswahyudi
Jurnal Geosaintek Vol 7, No 2 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v7i2.9097

Abstract

Daerah aliran Sungai Kaligarang Semarang yang mengalir dari selatan Semarang hingga bermuara di Semarang utara memiliki struktur sesar aktif dan sedimentasi dari enam formasi batuan yang berbeda yaitu Formasi Kerek, Kalibeng, Kaligetas, Damar, batuan gunungapi Kaligesik, dan aluvium. Kajian ini akan membahas provenance endapan sedimen daerah aliran Sungai Kaligarang yang terkait dengan tectonic setting Semarang. Hasil kajian provenance ini dapat digunakan untuk korelasi batuan dan interpretasi mekanisme pengendapan sedimen di Sungai Kaligarang. Metode dilakukan dengan mengumpulkan sampel sedimen dari Sungai Kaligarang yang kemudian dianalisis menggunakan mikroskop binokuler untuk mengidentifikasi jenis-jenis mineral berat. Jumlah mineral berat dihitung dan kemudian ditampilkan pada histogram untuk mengetahui perbandingan antara frekuensi mineral berat daerah penelitian dengan klasifikasi Mc Lane. Hasil analisis mineral berat menunjukkan bahwa Sungai Kaligarang didominasi mineral berat berupa ilmenit, magnetit, silimanit, muskovit, zirkon, andalusit, garnet, dan turmalin. Provenance mineral berat tersebut adalah dynamothermal metamorphic   yang terbentuk pada metamorfisme tingkat tinggi dan dipengaruhi oleh temperatur dan tekanan tinggi. Kesimpulan kajian ini adalah provenance berupa dynamothermal metamorphic sesuai dengan tectonic setting Semarang yang berada pada jalur orogenesa dan adanya pergerakan sesar mendatar dekstral yang kemudian mengalami reaktivasi  pada zaman Kuarter menjadi sesar mendatar sinistral. Mineral ilmenit, magnetit, dan silimanit yang dominan pada endapan terkait dengan fasies metamorfisme greenschist yang terjadi pada tekanan dan suhu yang tinggi. Mineral-mineral tersebut terbentuk pada kulit bumi bagian dalam yang terkait dengan aktivitas orogenesa.
Co-Authors Aditama, Maulana Rizki Akhmad Khahlil Gibran Andreas, Roy Anjar Tilaksono Anjar Tri Laksono Anjar Trilaksono Aries Susanty Arwan Apriyono Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo asmoro Widagdo Asmoro Widagdo Asmoro Widagdo Asmoro Widagdo, Asmoro Attabik, Laskarul Wildan Bela Agung Pratama, Bela Agung Dedi Kusnadi Dedi Kusnadi Dino Gunawan Pryambodo Dudi Hermawan Fadlin Fadlin Fadlin Fajar Rizki Widiatmoko Fajar Rizki Widiatmoko Firmansyah, Irwan FX Anjar Tri Laksono FX Anjar Tri Laksono FX Anjar Tri Laksono FX Anjar Tri Laksono FX Anjar Tri Laksono Gentur Waluyo Gentur Waluyo Gentur Waluyo, Gentur Gibran, Akhmad Khahlil Gumilar Ramadhan Hadi, Mochammad Nur Hari Prihatno Hasanuddin - Hermawan, Dudi Huzaely Latief Sunan Huzaely Latief Sunan Huzaely Latief Sunan Idra Permanajati Indra Permana Jati Indra Permana Jati Indra Permana Jati Indra Permanajati, Indra Irwan Firmansyah Januar Aziz Zaenurrohman Januar Fery Irawan Joko Prihantono Karisun, Kharisun Laksono, Anjar Tri Laksono, FX Anjar Tri Laskarul Wildan Attabik Mochammad Nur Hadi Muhamad Afirudin Pamungkas Muhamad Afirudin Pamungkas Muhammad Ramdhan Mustofa, Santia Ardi Nasir Sudirman Pamungkas, Muhamad Afirudin Paryanto Paryanto Prasetya, Yogi Adi Rachmad Setijadi Rachmad Setijadi Rachmad Setijadi Rachmad Setijadi Rachmad Setijadi, Rachmad Rino Wahyu Pamungkas Santi Dwi Astuti Santia Ardi Mustofa Semeidi Husrin Siswandi Siswandi Siswandi Siswandi, Siswandi Sukmaji Anom Raharjo Sumiyanto Sumiyanto Sunan, Huzaely Latief Syahrial Nur Amri Widiatmoko, Fajar Rizki Yanto Yanto Zaroh Irayani