Pacitan district have an interesting anomaly. Every time mostly impacted by disaster especially landslide. Landslides in their various forms are common hazard in mountainous terrain, especially in seismically active areas and regions of high rainfall. Landslides are one of the most common natural hazards in the Southern Range East Java terrain, causing widespread damage to property and infrastructure, besides the loss of human lives almost every year. The aim of this study predicted the potential landslide using Weight of Evidence Method. The geological data used lithological data, structural data, contour data and, alteration. Results from this data analysis are six evidence maps, such as NE-SW lineament, NW-SE lineament, host rock, heat source, kaolinite alteration and iron oxide alteration maps. The geophysical data analysis the distribution of rock density to interpretation the landslides. Evidence maps were analyzed by weight of evidence methods to result in favorable maps where the validity was tested using conditional independence (CI), the pairwise and overall tests. Then, the analyses produced a posterior probability map of the landslide. Posterior probability map (mineral potential maps) was validated by checking field. Posterior probability map (after validation) or favorable map predicted approximately favorable zone and non-favourable zones. Favorable zones of Potential Landslide Hazard Zonation, are divided into three classes. They are high-potensial hazard, moderate hazard and low hazard. Keywords: Pacitan, GIS, Weight of Evidence, Landslide
Research has been carried out on the existence of slip surfaces in Wanurejo, Borobudur District, Magelang Regency, Central Java. The location of the slip surface is identified using the resistivity method of the dipole-dipole configuration. This research was conducted at a relatively flat measurement location and at an altitude of around 95–105 meters above sea level. Measurements were made on 6 different lines with a length of track 1 of 250 m. The results of data processing indicate that the layer that acts as a slip surface is a layer of clay. The clay layer has a resistivity value ranging from 15 to 35 ohm.m, which is relatively thin, so it has the potential to become a slip surface because it is located between two rocks that have a significant resistivity contrast: compact andesite rock and water-saturated sandstone. If the water-saturated sandstone layer is no longer able to withstand the weight above it, the surrounding andesite rocks will easily slip. This is also reinforced by the presence of a layer of clay that is slippery, so the potential for landslides or slipping is greater.
Daerah Kabupaten Pacitan, areanya termasuk di dalam pegunungan selatan Jawa Timur, kaya akan kandungan mineral tembaga dan logam lainnya. Area berada di Kecamatan Ngadirojo, konsesi perusahaan PT.Gemilang Limpah Internusa, salah satu perusahaan yang bergerak di bidang industri pertambangan tembaga, dimana dalam produksinya menghasilkan Air Asam Tambang yang berpotensi mencemari sungai warga karena tambang ini terletak di hulu sungai. Menurut asal usul dan genesa, terbentuknya mineral logam, termasuk tembaga di dalamnya, terjadi karena proses hydrothermal di dalam permukaan bumi. Situasi ini yang menjadi sebab kegiatan eksploitasi terhadap mineral tersebut dan penyertanya menimbulkan adanya dampak perubahan kondisi lingkungan. Eksploitasi ataupun pengambilan material tersebut juga membuat kualitas dari air tanah sekitar memburuk. Saat ini perusahaan masih menggunakan metode cara lama, dengan menggunakan serbuk kapur tohor dalam mengikat polutan/limbah yang muncul. Metode elektrokoagulasi merupakan salah satu metode alternatif dalam mengelola air asam tambang, sehingga diharapkan tingkat kerusakan lingkungan dengan metode ini bisa menurunkan tingkat pencemaran dengan lebih baik. Dari beberapa percobaan, dengan waktu tertentu, semakin lama waktu aliran listrik, semakin baik tingkat penjernihan air asam tambang. Sehingga waktu yang diperlukan bisa dipercepat sebelum air masuk ke sungai. Elektrokoagulasi juga dapat sebagai alternative cara yang lebih efisien dan cepat untuk menetralkan air asam tambang selain dengan kapur tohor
Pacitan area is known as Tertiary volcanic arc in Java, as the result of subduction zone of the Indian-Australian Plate beneath the Eurasian Plate since Oligocene. It was superimposed volcanism which formed a wide area of hydrothermal alteration zone, resulting potential ore metals mineralization, such at Temon and its vicinities, Pacitan Regency, East Java Province, Indonesia. The aim of study was to analyze hydrothermal alteration and ore metal mineralization zones. Method was surface mapping, thin section analyses, mineragraphic analyses and X-Ray Diffraction (XRD) analyses. Field study observed denuded and deformed volcanic crater geomorphology. There are ore placer deposits within the sand dunes of Grindulu River, which it consists of andesitic lava and breccia of Early Oligocene Mandalika Formation; Early Miocene lithic and vitric tuffs; and dacitic intrusion. The dikes of dacite as the last of volcanism was the host rock controlling the zonation of alteration and mineralization stages. Oblique normal faults and shear faults were cross over dilating formed fractures, which were as bodies to depositing the ore metals. There are (zone 1st) the argillic clay consists of quartz+alunite+dickite+kaolinite±illite with vuggy structures, (zone 2nd) the argillic clay consists of quartz+montmorillonite±illite zone with quartz vents, brecciated and sulfide massive, and (zone 3rd) as the chloritized zone with low grade and supergene on the edge of hydrothermal alteration. It was fluid overprinted that very acid to the core of zone 1st (pH2-4) into more netral pH 4-6 (zone 2nd) and (pH5-6) in the edge zone 3rd. The potentials ore metal mineralization are Fe and Cu by pyrite, chalcopyrite, hematite, and covellite. Other potential ore metal mineralization was also from enargite by the supergene alteration.
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