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Hendarmawan -
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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ROCK DISCONTINUITY PATTERNS DEVELOPMENT ALONG CRUSHED ZONES SEPARATED BY FAULT MOVEMENT Hendarmawan -; Hirnawan, F. -; Muslim, D. -
Bionatura Vol 13, No 2 (2011): Bionatura Juli 2011
Publisher : Direktorat Sumber Daya Akademik dan Perpustakaan

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Abstract

Multivariate analysis was applied to rock-discontinuities taken from areas, in which folded and faulted sedimentary rocks occur. The purpose of the analysis is to verify the responses of these discontinuities to faults, from which the really existing fault can be delineated and mechanism and intensity of the deformation on Tertiary sediments underlying Quaternary sediments can be revealed that explain the intensity of neotectonism as the deformation continued on the Quaternary deposits. The sample parameters consist of strike and dip of both bedding planes and left also right diagonal joint sets respectively. From every site of two study areas two sample groups were taken from two rock-blocks separated by a fault. The analyses on the six parameters of the samples exhibit the contribution of each parameter to the rejection of the hypotheses of no effect of fault can be examined, which lead into a conclusion about how far does the parameter indicate the existing fault. The conclusion in Study Area 1 is that both right and left joint sets are significantly affected by reverse fault, suggesting that these two joint sets in uplifted rock-block were still affected by the folding process after reverse movement of the fault. Then, in Study Area 2, means of strike of bedding planes and right joint set significantly differ as a result of left lateral-slip fault certainly moving along a fractured zone.Key words: Discontinuity responses to fault, mechanism of deformation, intensity of deformation, neotectonism
Peran morfotektonik DAS DALAM PENGEMBANGAN potensi energi mikro hidro di Cianjur-Garut bagian selatan Sukiyah, E -; Sulaksana, N. -; Hendarmawan -; Rosana, M.F -
Bionatura Vol 14, No 1 (2012): Bionatura Maret 2012
Publisher : Direktorat Sumber Daya Akademik dan Perpustakaan

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Abstract

Geomorfologi kawasan Cianjur-Garut bagian selatan berupa pegunungan dengan kemiringan lereng landai hingga terjal. Sebagian wilayah memiliki anak-anak sungai berlembah sempit dan berjeram sehingga potensi sumberdaya air di kawasan ini termasuk berlimpah. Potensi tersebut dapat dimanfaatkansebagai sumber energi mikro hidro. Permasalahan yang diteliti adalah sejauh mana peran karakteristik geomorfologi akibat proses tektonik dalam pengembangan potensi energi mikro hidro. Sistematika penelitian didasarkan atas pola pikir bahwa peristiwa geologi masa lampau menghasilkan karakteristik geomorfologi tertentu. Bentuk geomorfologi dikontrol oleh tektonik, seperti diperlihatkan oleh karakteristik geomorfologi di Cianjur-Garut bagian selatan. Beragam parameter morfotektonik DAS dapat menjadi indikator untuk mendeteksi potensi energi mikro hidro. Daerah Aliran Sungai (DAS)yang dikontrol oleh tektonik memiliki bentuk ramping. Jaringan pengaliran berpola menangga, dengan orde sungai 1 dan 2. Kondisi ini memungkinkan debit air permukaan relatif besar dengan elevasi jatuhan yang tinggi. Pendekatan probabilistik digunakan dalam analisis data. Hasil analisis data karakteristik geomorfologi antara DAS Cipandak dan Cikaingan menunjukkan adanya perbedaan yang signifikan. Fenomena tersebut mengakibatkan perbedaan potensi energi mikro hidro di kedua DAS.Kata kunci: morfotektonik, DAS, mikro hidro
Co-Authors Hirnawan, F. - Muslim, D. - Rosana, M.F - Sukiyah, E - Sulaksana, N. -