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All Journal Jurnal RISET Geologi dan Pertambangan JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Buletin Sumber Daya Geologi
Febri Hirnawan
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Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Identifikasi prospek panas bumi berdasarkan Fault and Fracture Density (FFD): Studi kasus Gunung Patuha, Jawa Barat Cyrke A.N. Bujung; Alamta Singaribun; Dicky Muslim; Febri Hirnawan; Adjat Sudrajat
Jurnal Lingkungan dan Bencana Geologi Vol 2, No 1 (2011)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4749.663 KB) | DOI: 10.34126/jlbg.v2i1.17

Abstract

SARIPenelitian ini bertujuan untuk mengidentifikasi struktur permukaan daerah panas bumi berdasarkan densitas kelurusan, anomali magnetik, dan manifestasi panas bumi di permukaan. Struktur permukaan dianalisis melalui kerapatan lineament di permukaan dengan metode FFD. Lineament ini diasumsikan berasosiasi dengan fracture atau fault di daerah panas bumi yang umumnya tertutup oleh manifestasi permukaan sehingga sulit teridentifikasi. Fault dan fracture ini diasumsikan sebagai bidang lemah yang menjadi jalur pergerakan fluida termal sehingga dapat menjadi petunjuk bagi lokasi daerah permeabel atau reservoir. Berdasarkan metoda FFD yang dikompilasikan dengan data geomagnetik,diketahui bahwa daerah prospek panas bumi berada di daerah Cibuni, Kawah Putih-Kawah Ciwidey.Kata kunci: struktur, lineament, FFD, Panas bumiABSTRACTThis research aims to identify the surface structures of geothermal area based on lineament density, magnetic anomaly and surface manifestation. The surface structures were analyzed through the density of lineaments on the surface with FFD method. The lineaments are assumed associated with fractures or faults found in geothermal areas those are generally covered by surface manifestation which are difficult to be identified. These faults and fractures were assumed as weak plane that act as fluid thermal movement, thereby it can be used as guidance for the location of permeable area or a reservoir. Based on FFD method which was compiled with magnetic data, it is known that the prospect of geothermal area is located at Cibuni, Kawah Putih-Kawah Ciwidey.Keywords: structure, lineament, FFD, Geothermal
Similarity of Drainage Basin Morphometry Development on Quarternary and Tertiary Rock Deposits as a Measure of Neotectonic Intensity in Bumiayu Area, Central Java Febri Hirnawan
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 19, No 1 (2009)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2023.674 KB) | DOI: 10.14203/risetgeotam2009.v19.18

Abstract

ABSTRAK Batuan Tersier dan endapan volkanik Kuarter yang tidak selaras di atasnya sebagai produk Gunung Slamet, yang terdeformasi, menentukan perkembangan morfometri Daerah  Aliran Sungai Pemali di Kecamatan Bumiayu, Jawa Tengah dan sekitarnya. Dalam riset ini, morfometri  di daerah penyebaran kedua satuan batuan itu dipelajari sebagai gejala morfometri tektonik dalam artian pengaruh neotektonisme, yang mengakibatkan kerusakan infrastruktur.Hasil-hasil uji regresi-korelasi antara azimuth segmen sungai dan kelurusan di kedua satuan batuan yang berlainan usia tersebut adalah signifikan, yang menunjukkan nilai-nilai tinggi dari koefisien korelasi masing-masing r1 = 0.999 dan  r2 = 0.998, yang memberikan kesimpulan kuat bahwa tektonik sangat berperan dalam mengontrol proses perkembangan morfometri.Selanjutnya, uji beda rata-rata terhadap kedua variabel itu dan juga terhadap nisbah percabangan sungai (Rb) dan kerapatan pengaliran (Dd) dari dua DAS yang berkembang pada masing-masing satuan batuan tidak berbeda secara signifikan. Hasil uji ini memberikan kesimpulan bahwa perkembangan DAS tidak dipengaruhi oleh jenis batuan tetapi lebih oleh pengaruh pola deformasi. Fenomena ini menunjukkan bahwa tektonik masa kini aktif sehingga menghasilkan pola-pola kekar yang sama pada Formasi Halang dan Formasi Kumbang,  dengan  pada  endapan  volkanik sama pada Formasi Halang dan FormasiKumbang, dengan pada endapan volkanik Kuarter, yang secara menerus deformasi itu telah memotong bidang ketidakselarasan antara kedua formasi dan endapan Kuarter tersebut.
RESPONSE OF STABLE OVERALL SLOPE GEOMETRY OF OPEN PIT COAL MINE IN WARUKIN FORMATION TO DEWATERING AND PEAK GROUND SEISMIC IN SOUTH KALIMANTAN, INDONESIA Agus W Oscar; Ir. H. Dicky Muslim M.Sc.; Nana Sulaksana; Febri Hirnawan
Buletin Sumber Daya Geologi Vol. 11 No. 1 (2016): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (22443.505 KB) | DOI: 10.47599/bsdg.v11i1.10

Abstract

Understanding of the response of the mine slope stability is very important regarding the safety of life and investment / productivity / environment, as anticipation of landslide prevention based on the latest research. Mine slope behavior previously discussed widely in terms of the response due to dewatering and seismic (Peak Ground Acceleration) as well through verification. This paper aims to obtain a broad dimension of design criteria that are not only unstable slopes, but the slope is stable under various conditions of the rock mass saturation (dewatering) and seismic condition. Response of slope stability per geotechnical rocks unit from different formations or any engineering formation as a result of environmental influences, for example, the same quake, will be different. This means that the geometry of the same slope in other formation will have different stability conditions (safety factor of the slope) due to the same seismic acceleration. This is also similar due to dewatering. The method used for this study is the deductive-probabilistic method with a hypothetical verification approach. The Standard statistical analysis is used to test the data normality and homogeneity, average and independent differences, as well as regression-correlation test. The research results show that dewatering activitycan decrease ground water level (GWL/MAT) of the slope, so the durability of sliding along the sliding plane is reduced (increasing slope safety factor). At the same time earthquake reduces shear strength and increases driving force, so the safety factor of the slope suddenly downs. Slope stability decreased due to the earthquake, but dewatering improves slope stability. Thus, the slope in dewatering conditions will be kept stable through simulation to anticipate earthquake.
Co-Authors Adjat Sudrajat Agus W Oscar Alamta Singaribun Cyrke A N Bujung Dicky Muslim Nana Sulaksana