Desa Tamansari Kecamatan Karanglewas Kabupaten Banyumas merupakan salah satu desa yang sering mengalami kekeringan. Kegiatan eksplorasi sumber air tanah telah dilakukan menggunakan teknik geolistrik dengan konfigurasi Schlumberger. Teknik geolistrik ini bertujuan untuk mengetahui jenis dan kedalaman lapisan akuifer air tanah dan struktur batuan bawah permukaan berdasarkan nilai resistivitasnya. Akuisisi data geolistrik resistivitas dilakukan di empat titik sounding dengan panjang masing-masing lintasan adalah 400 m. Hasil penelitian menunjukkan bahwa struktur lapisan batuan bawah permukaan berdasarkan nilai resistivitasnya tersusun atas tanah penutup (0,18 – 5,25 m), batupasir konglomeratan (24,38 – 155,26 Ωm), batulempung pasiran (5,07 – 20,19 Ωm), batulempung karbonatan (napal) (2,57 – 3,41 Ωm), pasir lempungan (2,82 – 6,26 Ωm) dan batuan breksi (101,45 – 153,00 Ωm). Jenis akuifer air tanah yang diperoleh adalah akuifer tertekan, dimana lapisan akuifer ini ditemukan pada titik-titik sounding Sch-1, Sch-2, Sch-3, dan Sch-4 dengan kedalaman berkisar 48,89 – 145,64 m dari permukaan topografi. Litologi lapisan akuifer tertekan ini adalah pasir lempungan dengan ketebalan 46,11 – 84,5 m. Akuifer tertekan merupakan lapisan akuifer yang berpotensi di daerah penelitian. Sedangkan akuifer bebas tidak ditemukan di daerah penelitian.

In the southern part slope of Gunung Karang in Pandeglang, there are many well-outcrops of volcanic materials that developed during Quaternary. The deposits represent various lithofacies both vertically and laterally.In general the lithologic characteristics that are found in the study area can be grouped into three units, (1). Tertiary sedimentary rock, which is consists of tuffaceous mudstones interbedded with fine-grained tuffaceous sandstone and siltstone, (2) primary volcanic product consist of andesite lava flow, volcanic breccia/agglomerate, and pyroclastic rocks (ash tuff, lapilli tuff, bomb/block, and lapilli tuff breccia, and (3) secondary volcanic products, which is consisting of laharic breccia and coarse-grained thick-bedded sandstone.In general the deposits become younger to the top of topography (Gunung Karang), but locally the deposits are most likely overlapping each other’s.Keywords: Volcanic deposits, Gunung Karang

Amphibolite is part of Ciletuh mélange complex that was exposed together with serpentinite, harzburgite, dunite, gabro and basalt. The rock is dominated by amphibole and andesine and rarely can be observed quartz. At some locations, the rocks have changed to ampbibolite epidote (oligoclase + hornblende + actinolite + epidote + chlorite). The result of mineral paragenesis and measurement of pressure and temperature indicates that amphibolites was formed of 5 kbar – 6 kbar with temperature 640oC – 660oC. Meanwhile amphibolites epidote was formed of 4 kbar – 5 kbar with temperature 410oC – 455oC. Obtaining pressure and temperature from amphibolites is indicated as result of obduction and then it has retrograded metamorphism to amphibolites epidote because of accretion and uplifting at Upper Oligosen. The indication is characterized by actinolite changed to chlorite, albite and epidote have replaced andesine, and another indication is the rim of hornblende is replaced by actinolite.

Secara administratif, lokasi penelitian berada di Daerah Sungai Kinantan Besar dan Sekitarnya, Kecamatan Batang Asai, Kabupaten Sarolangun, Jambi. Kenampakan bentang alam dengan bentukan lahan beragam memiliki bukti dengan adanya proses kejadian geologi yang terjadi pada suatu daerah, baik bersifat endogen dan eksogen. Penelitian ini bertujuan untuk mengetahui karakteristik bentukan morfologi terhadap persebaran litologi batuan penyusunnya. Metode penelitian meliputi studi pendahuluan, observasi lapangan, kerja studio dan analisis laboratorium. Studi pendahuluan meliputi studi literatur untuk mengumpulkan informasi mengenai kondisi geologi regional dan keadaan geologi lokal daerah penelitian. Observasi lapangan meliputi pengamatan singkapan dan pengambilan sampel dan pengamatan bentukan morfologi dengan aspek-aspek geomorfologi. Kerja studio meliputi pembuatan peta-peta dengan mengelola pada data Digital Elevation Model (DEM) dengan skala peta 1: 25.000, diolah menggunakan software Global Mapper, ArcGis 10.6 dan ArcScene 10.6. Terakhir, analisis laboratorium dengan menggunakan plate thin section dengan ketebalan sekitar 0,03 mm dapat dilihat menggunakan mikroskopis polarisasi untuk mengetahui komposisi penyusun batuan tersebut. Pengelompokan dan pembagian bentukan lahan yang terbentuk pada daerah penelitian dipengaruhi oleh litologi. Hasil pembagian bentuk bentang alam daerah penelitian terbagi menjadi 4 bentuk lahan utama yaitu Perbukitan Zona Sesar (PZS) didominasi oleh litologi Batusabak, Bukit Intrusi (BI) didominasi dengan litologi Andesit, Perbukitan Berlereng Curam (PBC) didominasi dengan litologi Granit dan Meander River (MR).Administratively, the research location is in the Kinantan Besar River Area and its surroundings, Batang Asai District, Sarolangun Regency, Jambi. The appearance of landscapes with diverse landforms has evidence of the process of geological events that occur in an area, both endogenous and exogenous. This study aims to determine the characteristics of morphological formation on the lithological distribution of its constituent rocks. Research methods include preliminary studies, field observations, studio work, and laboratory analysis. Preliminary studies include literature studies to gather information on regional geological conditions and local geological conditions of the study area. Field observations include outcrop observations and sampling and observations of morphological formations with geomorphological aspects. Studio work includes making maps by managing Digital Elevation Model (DEM) data with a map scale of 1: 25,000, processed using Global Mapper software, ArcGis 10.6, and ArcScene 10.6. Finally, laboratory analysis using a thin section plate with a thickness of about 0.03 mm can be seen using microscopic polarization to determine the composition of the rock constituents. The grouping and division of landforms formed in the study area are influenced by lithology. The results of the division of landscape forms of the study area are divided into 4 main landforms, namely Fault Zone Hills (PZS) dominated by Batusabak lithology, Intrusion Hills (BI) dominated by Andesite lithology, Steep Sloped Hills (PBC) dominated by Granite lithology and Meander River (MR).

Metode gayaberat dapat menggambarkan kondisi struktur bawah permukaan berdasarkanvariasi medan gravitasi bumi yang disebabkan oleh perbedaan densitas antar batuan di bawahpermukaan pada daerah panas bumi Solok. Hasil metode gayaberat berupa peta anomalibouguer, peta anomali bouguer regional, peta anomali bouguer residual beserta penampangyang akan memberikan gambaran keadaan batuan bawah permukaan. Hasil pemodelangayaberat menunjukkan liniasi kontur yang mengindikasikan struktur geologi berupa sesardengan arah baratdaya-timurlaut dengan nilai densitas batuan2.85 gr/cc yang berada padalapisan batuan vulkanik tersier. Penelitian ini diharapkan dapat memberikan pemahamanterhadap karakteristik anomali gayaberat dan membantu tahapan eksplorasi lebih lanjut. Kata kunci : anomali, bouguer, densitas, gayaberat, regional, struktur bawah permukaan,panas bumi.

The mud flow which identified in Ciuyah area is located in Ciniru village, District Ciniru, Kuningan regency, West Java. Study of morphometry through the deployment of slope classes have described the class as a concentric distribution with location of Ciuyah mud flow in the middle. Annular’s drainage pattern at the regional scale is reflected of the circular in the Ciniru area, at around of site Ciniru extrusion Ciuyah mud mound. Circular patterns of distribution shown by the slope zone, and annular flow patterns in the river a more regional scale is suggest updoming beneath the surface. Interpreted that the migration channel and the possible fluid circulation is controlled by faults that developed in the study area. Structural geology are factors that contribute to the release or migration of fluid to the surface, and provide an outlet for material and fluid under conditions of excessive stress, clayey material which forming of bedrock formations is elusiation experience process, and eventually formed mountains of mud intrusion on the surface

Pada tanggal 25 April 2024 diketahui telah terjadi peristiwa gerakan tanah di daerah Jatisari, Kecamatan Bojongpicung, Kabupaten Cianjur, Provinsi Jawa Barat. Menurut keterangan warga sekitar, persitiwa tersebut terjadi setelah hujan dengan durasi yang cukup panjang. Studi ini bertujuan untuk melihat keterkaitan hujan dengan persitiwa gerakan tanah yang terjadi di daerah Jatisari. Metode yang dilakukan pada penelitian ini meliputi pengamatan lapangan, pembuatan geometri lereng, pengujian laboratorium, dan pemodelan. Pemodelan yang dilakukan berupa analisis rembesan air hujan dengan perangkat lunak Geostudio SEEP/W dan analisis kestabilan lereng dengan perangkat lunak Geostudio Slope/W. Dari analisis tersebut diketahui hujan yang terjadi selama 12 hari dengan intensitas 1.8 mm/jam atau hujan 6 hari dengan intensitas 60 mm/jam dapat menurunkan faktor keamanan (FK) hingga rentang nilai 0.684 – 0.763. Mekanisme berkurangnya kestabilan lereng ini terjadi akibat hilangnya matric suction. Hilangnya matric suction merupakan pengaruh dari infiltrasi air hujan ke dalam permukaan lereng.

Endapan batubara di daerah penelitian termasuk ke dalam Formasi Batu Ayau yang merupakan bagian dari Kelompok Tanjung pada Cekungan Kutei Atas bagian Barat. Diidentifikasi terdapat sebanyak 22 lapisan batubara dimana 4 (empat) lapisan batubara merupakan seam utama yaitu (dari bawah ke atas): seam B (1.05m), C (1.19m), D (1.43m) dan J (1.44m). Deskripsi megaskopis lapisan batubara: berwarna hitam yang didominasi pita terang (bright) – sangat terang (very bright), pecah blocky – concoidal, dan abundant cleat. Berdasarkan analisa maseral, batubara Eosen ini dapat diklasifikasikan sebagai tipe Vitrinite A. Rank batubara di daerah penelitian adalah low – medium volatile bituminous – semi antrasite (Rv: 1.75 – 2.0 dengan VM-daf: 13.78% – 28.14%) dan memiliki kualitas batubara metalurgi dengan CSN 8.5. Fasies sedimen pembawa batubara berupa perselingan fasies batupasir dengan batulanau dengan sisipan lapisan batubara. Fasies batulanau sisipan batubara diinterpretasikan merupakan endapan rawa yang dipengaruhi oleh aktivitas limpas banjir sedangkan fasies batupasir merupakan tipe endapan channel dan point bar. Kedua fasies sedimen ini diendapkan pada lingkungan fresh water atau sistem lingkungan pengendapan fluvial dengan pola meandering dan/atau braided system yang dipengaruhi oleh floodplain. Lingkungan pengendapan ini terbagi menjadi empat siklus sekuen lingkungan pengendapan fluvial. Berdasarkan analisa kualitas conto diketahui bahwa proses coalification batubara secara vertikal dikontrol oleh proses burial depth dan secara lateral dikontrol oleh adanya struktur geologi yang diidentifikasi sebagai bagian akhir dari Adang Flexure serta oleh adanya intrusi batuan beku Sintang yang tidak tersingkap ke permukaan. Kata kunci: Batubara Eosen, Type, Rank, Batubara Metalurgi, Fluvial System, Coalification.

Gunung Salak land forms hills and valleys, composed of typical volcanic deposit that controlled by geology structures. The research was conducted in several stages, there are: references study, field study or geological mapping (observation of geomorphology or landforms, rock type and genesis, geology structure indication) as well as data analysis. Landform of southeast part of Gunung Salak can be devided into steep hill geomorphological unit that lied on high land, formed by Salak volcanic deposits, with radial drainage pattern; and sloping hill geomorphology unit with smooth contours that lied on lowland, formed by Salak and Pangrango mixing volcanic deposits. The southeast part of Gunung Salak foothills from lower to upper consecutively composed by pumiceous tuf volcanic deposit; laharic breccia; lapili and pumiceous tuf with paleosoil layer intercalations; and andesitic lava. Geology structure indications was difficulty observed because of thin soil cover and sloping dip of rock layer (<10º).

This study focuses on the petrography characteristics of the volcanic rocks in Mount Komba, Flores Sea, Nusa Tenggara Timur.Based on textural and mineralogical characteristics, volcanic rocks Mount Komba are composed of andesite-basaltic lava flows. It is chiefly porphyritic, intergranular, intersertal to glomeroporphyritic clots textures that contains variable proportion of plagioclase, pyroxene, biotite, hornblende and opaque oxide minerals phenocryst in very fine grained groundmass contains clinopyroxene, plagopclase laths, devitrified glass and opaque oxide minerals. Plagioclase phenocrysts show sieve-textured cores, opaque inclusions, compositional zoning, and skeletal melt pockets. Pyroxenes are strong zones with rims. Some are poikilitic. Biotite commonly exhibits a deep russet color parallel to its slow ray, the perpendicular direction being light to medium yellow brown. Some are altered to an asseblage of chlorite and finely granular opaque oxide minerals. Hornblende is perhaps slightly less abundant than biotite and occurs typically in euhedral to subhedralo crystals. It is pleochroic in shade of olive green and brownish yellow, rarely exhibiting a bright apple-green shade. Among the accessory minerals, opaque oxide minerals occurs as euhedral wedge-shape or blocky to slightly rounded, broken grains are common and also as a fine grainded alteration product associated with chlorite, formed from biotite and hornblende. Fresh glass is present, though in most cases the glass is devitrified.Some Mount Komba volcanic rocks studied exhibit varying degrees of propylitic or sericitic alteration. Feldspars plagioclase in particular, in most of the intensely hydrothermally altered Mount Komba volcanic rocks have been replaced by fine grained sericite, clay minerals, carbonate, chlorite, epidote and opaque oxide minerals.

Pulau Bengkalis memiliki kondisi geologi yang sebagian besarnya terisi oleh endapan yang paling tua yaitu endapan alluvium dan sebagiannya lagi oleh gambut. Endapan alluvium yang terdiri dari lempung, lanau, dan pasir serta sebagian gambut. Endapan alluvium tersebut sebagian besar memiliki mineral lempung dibandingkan dengan mineral kuarsa. Karakteristik endapan alluvium dengan material lempung, lanau, dan pasir secara umum memiliki warna abu – abu kehitaman dengan butiran yang didominasi oleh lempung, lanau, dan pasir yang terendapkan secara perselingan dan juga memiliki tekstur kebundaran yang sangat bundar dengan kemas yang terbuka. Pada sebagian daerah penelitian yang terisi oleh gambut memiliki komposisi yang berupa akar – akar tumbuhan yang berserabut. Pada daerah penelitian terdiri atas empat satuan batuan yaitu satuan batupasir, satuan batulempung, satuan batulanau, satuan endapan alluvium dan sebagian gambut. Hasil analisis XRD menunjukkan bahwa daerah penelitian memiliki mineral lempung jenis kaolinit dengan persentase sebanyak 7% dengan komposisi AL2Si205(OH)4 serta mineral penyerta terdiri atas mineral kuarsa dengan komposisi Si02 sebanyak 85%, clinochlore sebanyak 4% dengan komposisi Mg5Al2(Si,Al)4O10()H)8, muscovite sebanyak 4% dengan komposisi KAl2(Si3Al)O10(OH,F)2. Geomorfologi pada daerah penelitian terdiri atas dua satuan geomorfologi yaitu satuan geomorfologi pedataran landai alluvial dan satuan gemorfologi pedataran agak landai alluvial. Tujuan penelitian ini mengetahui kondisi geologi Pulau Bengkalis berdasarkan pada pengamatan geologi daerah penelitian serta mengetahui karakteristik endapan batulempung pada daerah penelitian berdasarkan hasil analisis mineral lempung.Kata kunci : batulempung, kuarsa, kaolinit, chinochlore, muscovite, XRD (X-ray diffraction).

Geological conditions Jatinangor campus is a volcanic deposits that have 3 potential aquifer, the unconfined aquifer is a depth of 0-60 m, confined aquifer 1 at a depth of 80-90 m and confined aquifer 2 at a depth of 120-200 m. The results of groundwater potential calculation is done using the method of numerical groundwater flow pattern is obtained relative trending Northwest - Southeast tend to follow topographical pattern. This is consistent with the geological-geophysical mapping data that the geometry and pattern of shallow groundwater aquifers configuration follows the pattern of topographic contours. However, the groundwater in the aquifer geometry and pattern configuration does unfollow the pattern of topographic contours, but follows the pattern of the stratigraphy and structural geology. The quality of groundwater in the shallow aquifer or aquifer in not affected by topography, groundwater quality is controlled by the pattern of stratigraphic and structural geology. Ground water Chemical typehas results are Ca-HCO3; Mg ; Mg-HCO3 and No-type. The results of measurements of physical character in the field, existing groundwater generally meet the requirements of the quality standards for drinking water. The test results of the pumping test wells 10 point values obtained transmissivity (T) ranged from 86.4 to 467.9 m2 / day and Permeability (K) ranging between 1.2 x 10-4 - 6.3 x 10-6 cm / sec. Based on the well test results obtained transmissivity values diversity and rock permeability significantly, it could be interpreted that the distribution of the research areas of uneven rocks.

The morphology of investigated area is a flat area and hilly area at elevation reaching 20 meters above the sea level. The lateritic nickel is a residual soil from weathering, resulting from serpentinite, hasburgite and dunite being ultramafic complex according to the geologic map of Batui sheets, Celebes.The extent of investigation is 8000 hectare as the permit from the regency of Banggai, and the thichness of nickel bearing lateritic soil averaging 2 meters, and therefore is roughly estimated 160.000.000 cubic meters. If the specivic gravity of lateritic soil is 2.6 and nickel content average 0.8 %, the reserve of lateritic nickel is will be 160,000,000 M³x 2.6 x 0.8% = 3,328,000 Tons. It is suggested to be mined by open pit method because the lateritic soil on the surface with only averaging thichness of soil 2 meters.

Air asam tambang merupakan limbah pencemaran lingkungan yang disebabkan oleh aktivitas penambangan. Limbah air asam tambang terbentuk karena adanya proses oksidasi mineral pirit (FeS2) dan bahan mineral sulfida lainnya yang tersingkap pada permukaan tanah. Identifikasi air asam tambang perlu dikaji sebagai usaha untuk menentukan potensi material membentuk asam melalui parameter analisis geokimia dengan metode net acid generation pada sampel material. Penelitian ini dilakukan dengan beberapa tahap yaitu pengambilan sampel yang dilakukan dengan metode komposit pada 6 jenis material yang diambil dari 21 lokasi pengamatan yang ditentukan dengan menggunakan metode simple ramdom sampling. Sampel material dianalisis pada laboratorium dengan menggunakan analisis geokimia metode net acid generation (NAG) dengan 4 parameter acuan yaitu : total sulfur, acd neutralizing capacity, maximum potentially acidity, net acid production potential. Hasil analisis geokimia kemudian di klasifkasikan berdsarkan sifat keasaman menjadi material potentially acid forming atau non acid forming. Hasil pengujian menyimpulkan Mz1 merupakan material topsoil pada lapisan overburden, Mz2 merupakan material subsoil overburden, Mz3 merupakan material claystone overburden, Mz4 merupakan material siltstone overburden, dan Mz5 merupakan material sandstone overburden diidentifikasi sebagai material non acid forming atau material non acid forming tipe 1. Mz6 merupakan material claystone interburden berdasarkan diidentifikasi sebagai material potentially acid forming atau material potentially acid forming tipe 3.

ABSTRAKKabupaten Kuningan hingga saat ini belum memiliki Sistem Pengelolaan Air Limbah Domestik(SPALD). Pertimbangan untuk mengatasinya adalah dengan melakukan inventarisasi, survei danpemetaan geologi lingkungan. Dalam zonasi wilayah calon pengembangan, belum secaraoptimal ditentukan kondisi geologi setempat. Dilakukan penelitian ini yang bertujuan untukmengetahui parameter geologi lingkungan yang berperan dalam menentukan lokasi pembangunanpengolahan limbah yang sesuai standar dan prosedur, dengan mempertimbangkan segala aspek terutamageologi. Metode yang digunakan yakni dengan mengolah data sekunder menggunakan metode SimpleAdditive Weighting (SAW) untuk mendapatkan peta kesesuaian lahan yang selanjutnya akan dilakukantahap analisa dari overlay peta (superimposed). Parameter yang digunakan sebanyak sebelas parameter,terdiri atas parameter fisik dan non-fisik, dari hasil overlay peta maka akan didapatkan zona prioritasdengan proses skoring, yang merupakan salah satu metode yang membantu melakukan prediksiberdasarkan parameter yang telah disesuaikan. Didapatkan lokasi yang sesuai untuk pembangunan di limakecamatan, yakni Kecamatan Jalaksana, Cigugur, Kramatmulya, Kuningan, dan Lebakwangi. Penentuanlokasi lebih mendetail diperlukan untuk penentuan akhir pembangunan SPALD-T yang ideal.Kata Kunci: Pengolahan limbah, Simple Additive Weighting (SAW), Overlay, Scoring, KabupatenKuningan

Research at the Poso river Tentena – Sulewana segmen and Meko river, North Pamona district and West Pamona District, Poso regenc, Central Sulawesi Province. Rock there research area is river alluvial with the potential mining are sand and rock boulders, the mechanical laboratory of rock boulders of point load test result 207,005 – 744,797 Kg/Cm square, fullselment required for building material. Environmental condition of Poso river there are infrastructure for people housing, road of Poso – Tentena (Trans Sulawesi) and Poso Hydroelectric Power at the Sulewana village and the bridge, Meko river there are people housing and the bridge of Tentena Pendolo, and the forest and the many people garden. At the Poso river Tentena – Sulewana segmen sand can mine but the water level of river much be constant the water level of river much be constant until save the Poso Hydroelectric Power, at the Poso lake sand mining is problem with use the sump machin of sand until 20 meters depth, means the lateral pressure is not save to lake wall and to bellow the safety factor from 1,25 to 1,00 is critical condition, if there little tremble is sliding. At the Meko River there are bridge facility of road Tentena – Pendolo much be not disturb.

Asri Basin is one of Indonesia’s sedimentary basins, and it is the carbon dioxide storage target in Carbon Capture Storage (CCS) technology. A study of carbon dioxide storage containers must be carried out based on geological aspects, namely geological and rock conditions. This research aims to identify reservoir feasibility values in the Asri Basin, such as pore pressure and fracture pressure, along with other factors affecting reservoir stability, in order to minimize leakage during the carbon dioxide injection process. The identification process in this research uses quantitative and qualitative studies based on well data. Eaton's method was used to estimate the research well pore pressure and fracture pressure in the research wells. The research well is located in the crestal area of the Asri Basin and has a pore pressure with a normal pressure trend. The fracture pressure value gets smaller in the depth range of the Talang Akar Formation. There is a process of diagenesis of the clay mineral smectite into illite, which begins to be found at a depth of 3000 - 3500 ftTVDSS. The developed stress regime is a normal stress regime with the vertical stress value as the largest. The injection process in the Asri Basin can be carried out in the Talang Akar Formation with several five storage intervals at a depth of 3560 - 4130 ftTVDSS.

ABSTRAKBendungan Pelosika direncanakan memiliki kapasitas tampung air sebesar 822,26 m3 dengan luas lahan genangan 160.000 hektar. Keberadaan bendungan diharapkan dapat mengurangi debit banjir sebesar 10,359 m3/detik, menyediakan air baku dengan debit sebesar 0,20 m3/detik dan dapat membangkitkan listrik sebesar 10 MW. Konstruksi Bendungan tipe Rock Fill Dam berlokasi di Sungai Konaweha yang merupakan salah satu sungai terbesar di Sulawesi Tenggara. Irigasi untuk lahan seluas 20.040 Ha di Kabupaten Kolaka Timur dan Konawe diharapkan dapat terpenuhi. Geomorfologi lokasi rencana Bendungan Pelosika terdiri dari Pegunungan dan pedataran. Wilayah ini tersusun oleh batuan metamorfik berumur Paleozoikum dan endapan aluvium berumur Kuarter. Studi awal kondisi tektonik lokasi rencana Bendungan Pelosika menggunakan pendekatan morfometrik berdasarkan analisis indeks rasio lebar dan tinggi lembah (Vf) dan sinusitas muka gunung (Smf). Pengolahan citra satelit dan Sistem Informasi Geografis (SIG) digunakan dalam metode penelitian. Variabel morfometrik dan data indikasi tektonik diperoleh dari hasil pengolahan citra Landsat 8 OLI dan SRTM 30 m. Hasil analisis kelurusan geomorfologi menunjukkan arah umum UBL-STG yang berimpit dengan sesar-sesar yang ada di wilayah tersebut. Elevasi tertinggi berada pada 2.852 mdpl dan elevasi terendah -100 mdpl. Daerah Aliran Sungai (DAS) seluas 715.041 Ha dengan panjang total sungai sekitar 145,85 Km. Analisis morfotektonik pada empat lokasi terpilih menunjukkan nilai Vf antara 0,25 hingga 0,75 dan nilai Smf antara 1,06 hingga 1,17. Berdasarkan hasil analisis kedua variabel morfotektonik tersebut diketahui bahwa daerah rencana dudukan Bendungan Pelosika berada di daerah dengan kondisi tektonik menengah hingga aktif.Kata Kunci: Bendungan Pelosika, morfometrik, tektonik, citra satelit, SIGABSTRACTPelosika Dam is planned to have a water holding capacity of 822.26 m3 with an inundation area of 160,000 hectares. This dam is planned to reduce flood discharge by 10.359 m3 / second, provide raw water with a discharge of 0.20 m3 / second and can generate electricity by 10 MW. The Rock Fill Dam type of construction is located on the Konaweha River which is one of the largest rivers on the mainland of Southeast Sulawesi. It is also expected to be able to flow through irrigation of 20,040 hectares in the districts of East Kolaka and Konawe. Regionally, geomorphology is in the form of mountains and plain. The constituent rocks are Paleozoic metamorphic rocks and Quaternary alluvium deposits. The initial study of tectonic conditions of the Pelosika Dam site plan uses a morphometric approach based on the analysis of the valley width and height ratio (Vf) and sinuosity mountain front (Smf). Satellite imagery processing and Geographic Information Systems (GIS) are used in research methods. Morphometric variables and tectonic indication data obtained from Landsat 8 OLI and SRTM 30 m imageries processing. The results of the geomorphological lineament analysis indicate that the general direction is North Northwest - South Southeast which coincides with faults in the region. The highest elevation was 2,852 meter after sea level and the lowest elevation was -100 meter after sea level. Watershed covering an area of 715,041 hectares with a total river length of around 145.85 kilo meters. Morphotectonic analysis at four selected locations showed a Vf value between 0.25 to 0.75 and a Smf value between 1.06 to 1.17. Based on the results of the analysis of the two morphotectonic variables, it is known that the Pelosika Dam area designation is in an area with medium to active tectonic conditions.Key words: Pelosika Dam, morphometric, tectonic, satellite imagery, GIS

Administratively, the research areas included in the district of Semarang, Central Java Province. This research was conducted at Jeragung River with the object of claystone and sandstone. In physiographic, rocks in the study area are in Kendeng Basin, and parts of Anggota Banyak Kalibeng Formation. This study aims to determine the characteristics of sedimentary rocks mainly sandstones, based on petrographic analysis to determine the source of the sediment and diagenesis processes that formed. Based on observations of six sandstone samples from areas of research included in Feldspatic Wacke. Provenance analysis of six samples of sandstone with using Dickinson and Suczek triangles, shows the origin of sediment is arc magmatic. Diagenesis phase which occurs is eogenesis characterized by compacting and leaching, mesogenesis marked by cementation and recrystallization, as well as the replacement and deformation marks telogenesis process.

Sub-District Of Manggahang, District of Bale Endah have hilly and plain morphology with enough difference of height. Geologically is compiled by volcanic rock which consist of brecia, tuff, and lava which product of Old Volcanic. It is included in Cikapundung Formation which Middle Plistosen age (Silitonga, 1979) and lake sediment representing interval of fine clasticas clayey tuff, silty tuff, locality is found the existence of plant pickings, fine-coarse sandstone till with congelation rock fragment, this sediment is Quater age.Based on resistivity value, rock stratigraphy in study area have resisitivity which vary start from value set of Ωm (soil), tens of Ωm (brecia/tuff weathered), hundreds of Ωm (brecia-tuff), thousands of Ωm (lava 1), tens of thousand Ωm (lava 2), and hundreds of thousand Ωm (lava 3), third of him represent of andesitic lava (porfiry andesit at upper, and porfiry diorit at bottom).At high elevation covered by soil which thiner than foot-hill with spreading follow topography. Bellow of soil are interval of brekcia and tufa disseminating until assumption point GL - 02. and more thinning at foot area (to southern). Below interval of brecia and tuf, there are andesitic lava. At top hill, there is lava at 800 m elevation and in GL-02 having elevation 700 m. Hence if taken by elevation 700 m representing boundary of lower elevation, hence is andesitic lava from 100 m till 10 m.