Pengaruh Alterasi Hidrotermal Terhadap Kestabilan Lereng dan Mekanisme Gerakan Tanah, Daerah Patuhawati, Kecamatan Pasir Jambu, Kabupaten Bandung, Propinsi Jawa Barat

• Main Authors: , I Putu Krishna Wijaya, , Prof. Dwikorita Karnawati, M.Sc.,Ph.D
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2014
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/128112/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=68443
• Institution: Universitas Gadjah Mada

occured Landslide disaster in Dewata Tea Plantation killed 70 people and more than 50 houses buried. This research project were located at Patuhawati area, and those sites are situated in the areas with the susceptibility and vulnerability hazard.Most of Patuhawati area are covered by material of Mount Patuha and it has an intensive hydrothermal alteration. The research is carried out toexplain about the influences of hydrothermal alteration to slope stability and the mechanism of landslide in such geologic conditions. conducting There are several steps that is used for research method. First, is preparing and collecting all secondary data that is related to this research, and the second is collecting the primary data by some detailed surface mapping, such as observing and measuring the slope of morphology, litology observation and landslide point scarp, observing the alteration zone, geological structure measurement and landuse.The third stage is to conduct a laboratory analysis of soil engineering properties, XRD analysis and petrographic analysis. . As a semi quantitative method, AHP AHP method is used as data analysis analysis is conducted by give some variation of weight value on matrix comparison to understand the most influence factor which controlling landslide. The result show that hydrothermal alteration is 2,68 times more important than geological engineering, morphology, and structural geology factor, and 7,03 times more important than landuse factor. Each sub parameter is given score between 1-3 as their influence to landslide. Susceptibility weighted value then multiple by sub parameter score to conduct susceptibility map by using spatial analysis (weighted overlay) in ArcGIS. The verification result show that the most susceptible zone has the highest number of landslide point. The second conclusion is argilic alteration gives more influence than sub propilitic alteration to controlling landslide. It�s because of physical properties of clay mineral of argilic which is decreasing shear strength material on the slope. Mechanism of landslide in Cicacing are rotational landslide where high level of rain fall infiltration as a main triggering factor, beside the earthquake.