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All Journal KURVATEK Prosiding SNAST Journal of Applied Geology
Winarti, Dwi
Universitas Muhammadiyah Mataram
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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PROCESS IN THE HYDROTHERMALLY ALTERED AREA AT SOUTHERN MOUNTAIN OF LOMBOK ISLAND, INDONESIA dwi winarti; Srijono Srijono
KURVATEK Vol 1 No 1 (2016): April 2016
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v1i1.222

Abstract

Landslide disasters are abundant in the mountainous areas of Lombok Island, Indonesia. Most landslides frequently occur in areas intensively suffered by hydrothermal alteration including Pelangan Village at Southern Mountain, West Lombok Regency. The objective of this study are to identify the most important factors controlling landslide and also to analyze the landslide susceptibility zones in the hydrothermally altered area. For this purpose, it is necessary to prepare the landslide investigation and landslide susceptibility map. In this study, the AnalyticalHierarchyProcess (AHP) is used to develop landslide susceptibility map. The landslide susceptibility was analyzed by applying weighting and scoring on each factor controlling the landslide occurrence, such as hydrothermal alteration, slope inclination, distance to lineament, and landuse.The result shows that hydrothermal alteration and slope inclination are the most important parameters to landslide occurence (39.35%), and the least important factor are distance to lineament (13.76%), and landuse (7.54%). The high susceptible zones (HS) cover about 34.20% of the total study area. The moderate susceptible zones (MS) cover about 18.40% of the total area, while about 27.80% of the total study area were classified as being the low susceptible zone (LS), and about 19.60% of the total study area are  classified as very low susceptible zone (VLS).   
KARAKTERISTIK GEOTEKNIK TUFA ANDESIT TERALTERASI HIDROTERMAL PEMICU LUNCURANBAHAN ROMBAKAN PADA LERENG PEGUNUNGAN SELATAN PULAU LOMBOK Dwi Winarti; Dwikorita Karnawati; Hary Christady Hardiyatmo; Srijono _
PROSIDING SNAST Prosiding SNAST 2016
Publisher : IST AKPRIND Yogyakarta

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Abstract

Lebih dari 12 kejadian gerakan tanah pada bagian barat lereng pegunungan Selatan Pulau Lombokterekam selama periode 2013 hingga Januari 2014. Gerakan tanah berupa luncuran bahan rombakan terjadi di daerah Rambut Petung, Kecamatan Sekotong, Kabupaten Lombok Barat. Luncuran bahan rombakan tersebut terjadi pada lereng dengan kemiringan 40° yang tersusun oleh tufa andesit teralterasi hidrotermal. Studi geoteknik terhadap tufa andesit dilakukan untuk mengetahuipenyebab gerakan tanah, sifat keteknikan material penyusun lereng, dan kondisi stabilitas lereng di daerah Rambut Petung. Untuk mencapai tujuan tersebut, metode penelitian yang digunakan meliputi studi literatur, penelitian lapangan, analisis laboratorium, dan analisis stabilitas lereng.Hasil penelitian menunjukkan bahwa luncuran bahan rombakan di daerah penelitian terjadi karena adanya faktor kontrol berupa perbedaan kekompakan material penyusun lereng dan kecuraman lereng, serta pemicu gerakan berupa penurunan kekuatan tufa andesit akibat alterasi hidrotermal. Proses alterasi hidrotermal menyebabkan peningkatan nilai porositas dan penurunan kuat geser tufa andesit. Hasil analisis stabilitas lereng menunjukkan bahwa lereng alami dengan kemiringan 40° dalam kondisi tidak stabildengan nilai FK < 1,3. Upaya perbaikan geometri lereng dengan kemiringan 18° (3H:1V) menghasilkan nilai FK > 1,5 sehingga lereng dalam kondisi stabil baik untuk pembebanan sementara maupun pembebanan tetap.
Mineralogical and Geochemical Control of Altered Andesitic Tuff upon Debris Slide Occurences at Pelangan Area, Southern Mountain of Lombok Island, Indonesia Dwi Winarti; Dwikorita Karnawati; Hary Christady Hardiyatmo; Srijono Srijono
Journal of Applied Geology Vol 1, No 1 (2016)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2054.489 KB) | DOI: 10.22146/jag.26953

Abstract

Debris slides were recently found in the Pelangan area at Southern Mountain of Lombok Island, Indonesia. Pelangan is well known as the gold mineralization and hydrothermal alteration area. This study is aimed to identify the mineralogy and geochemistry of altered andesitic tuff that controlled slope instability and induced debris slides. For this purpose, it is necessary to prepare the field observation and laboratory analyses. Landslide inventory reveals that the Pelangan debris slides mostly occur in altered andesitic tuff. Based on the outcrop observations in the field, andesitic tuff found around the Pelangan debris slides have been altered in general. The strong intensity of alteration developed by hydrothermal alteration in this study area produces large amount of clay minerals especially montmorillonite, kaolinite, and illite. The abundance of those clay minerals reflect the intermediate argillic alteration. Montmorillonite is a type of clay mineral that easily swells at wet condition and easily shrinkages at dry condition. Swelling of clay mineral destroys intersheet and interlayer bonds, and reduces shear strength. The presence of clay minerals in the altered andesitic tuff of intermediate argillic zone can be considered as one of the factors that induced to the Pelangan debris slides. Further studies on geotechnical and slope stability analysis of the landslide area are crucial to be done for better understanding of the characteristics of the altered rocks inducing hazardous landslides.
Co-Authors Dwikorita Karnawati Dwikorita Karnawati Hary Christady H. Hary Christady Hardiyatmo Hary Christady Hardiyatmo, Hary Christady Srijono Srijono Srijono Srijono Srijono Srijono, Srijono Srijono _