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All Journal Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Earth and Marine Technology (JEMT)
Iswahyudi, Sachrul
Teknik Geologi, Fakultas Teknik, Universitas Jenderal Soedirman
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Physics Transportation

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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.
Co-Authors Asmoro Widagdo, Asmoro Bela Agung Pratama, Bela Agung Dedi Kusnadi Fadlin Fadlin Hadi, Mochammad Nur Laksono, Anjar Tri Widiatmoko, Fajar Rizki